Tektronix VX4521 User Manual

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User Manual

Tektronix

/

VX4521

Advanced

Resource

Manager

This

document applies

for

firmware version

1.00

and

above.

Please

check

for

change

information

at the

rear

of

this

manual.

Second Edition:

September

1994

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Copyright O Tektronix, Inc.

1992,

1994.

All

rights

reserved.

Tektronix products are covered

by

U.S.

and foreign patents, issued and pending. Information

in

this publication supercedes

that

in

all

previously published

material.

Specifications and

price

change privileges reserved.

Printed

in

the

U.S.A.

Tektronix, Inc.,

P.O.

Box 1000, Wilsonville,

OR

97070-1000

TEKTRONIX

and

TEK

are registered trademarks of Tektronix, Inc.

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WARRANTY

TekUonix w'mants that this product will be free from detccts in materials and workmanship for a period of three

(3)

years from the date of shipment. If any such product proves defective during this warranty period, Tektronix,

at its option, either will repair the defective product without charge for parts and labor, or will provide a

replacement

in exchange for thc defective product.

In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the warranty period and make suitable arrangements for the performance of service. Customer shall be responsible for packaging and shipping the defective product to the service center designated by Tektronix, with shipping charges prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the

counlry in which the Tektronix service center is located. Customer shall be responsible for

paying

all

shipping charges, duties, taxes, and my other charges for products returned to any other locations.

This warranty shall not apply to

any

defect, failure or damage caused by improper use or improper or inadequate

maintennnce and care. l'ektronix shall not be obligated to furnish service under this warranty a) to repair damage

resulting from attempts by personnel other than Tektronix representatives to install, repair or service the product;

b)

to repair damage resulting from improper use or connection to incompatible equipment; or c) to service a product that has been modified or integrated with other products when the effect of such modification or integration increases the time or difficulty of servicing the product.

THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS PRODUCT IN LIEU OF

ANY OTHER WARRANTIES, EXPRESSED OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLLED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A

-

PARTICU1,AR PURPOSE. TEKTKONIX' RESPONSIBILITY TO REPAIR OR REI'LACE DEFECTIVE PRODUCTS IS

THE

SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR

CONSEQUENTIAI, DAMAGES IRRESPECTIVE OF

WHETHER TEKTRONIX OR

THE

VENDOR HAS ADVANCE NOTICE OF THE POSSIHI1,ITY OF

SUCH DAMAGES.

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WRT

WRTB

WRTBSETUP

WSCMD

WSCMD?

WRT

7,

z2

z,;Data - writes to VME memory space. (3 - 541

WRTB Data

-

writes to VMEbus memory space. (3 - 56)

WRTBSETUP

z,

7,

z3

-

sets up parameters for a write to VMEbus

memory space. (3

-

57)

WSCMD LA, CMD - sends the specified WSP conirnand to a VXI device. (3

-

581

WSCMD? LA, CMD

-

sends the WSP command to a VXI tlevlce. The

response value is returned in ASCII decimal format. (3

-

59)

The input trigger llnes are any one of the 8

TRIGGER COMMANDS

VXlbus TTL trigger lines, either

of

the 2 VXlbus

ECL trlgger lines, the front panel External trlgger

input, the

VX4521's software trigger, or the IEEE-488 GET signal

The output trigger

lines may be any combination of the 8 TTL trlgger lines, the 2 ECL trrgger lrrles or th~ front panel output trlgger line.

All

coninlands must terrnlnate with a

<

CH

>

.c

LF

>

ConnTrg (Source Dest IEnblll - allows

connecting

one Input trlgger Ilne to orit: or riiore

output trigger I~nes. (3

-

63)

DcorrTrg (Source IDestl)

-

selectively

d~sconriects an Input trlgger Ilne from o1ie or more outp~lt trigger Ilnes, without aflectcng any other output trigger llrle coririectlorls to that input Ilne.

(3

-

64)

EriblTrg (IDestl]

enables the trlgger llne connectlon estabhshed wlth thv Cor~nTrg

conirnand (3

-

65)

nsblTrcJ (IOestl)

dlsahles the trlgger connectlon set by the ConnTry c~~r~rrlrarid

13 661

DelayTrg (Source Dest Delay IContl [HI [ENBLII

-

speclfles a delay between tlre Inpttt

trlgger event and the output trigger signal.

(3

-

671

PulseTrg (Source Dest Period ICont]

(HI

IENBLI) - converts the Input trlgyer event to a

low golng output pulse or square wave of user-defined frequency.

(3

-

69)

Swlrg

generates the VX4521's software trlgger. (3

-

70)

TryCnfg - returns the current trigger connectlon matrix In table format. (3 - 71)

VX4521

INTERFACE MODULE

QUICK

REFERENCE GUIDE

Nurnbers in parentheses refer to the page(s) in the Operating Manual

Be sure all switches are correctly set. (p.

1

-

31

SETUP

Follow Installotion guidelines.

Ip.

2

-

1)

LEDs

Power Faled MSG AST LTN TLK SRQ ATN REN

When 111, the LEDs irid~cate the following:

power supphes functioning niodule failure rnodule is processing a VMEbus cycle lnd~cates VMEbus activ~ty by monitor~ng Address Strobe (AS

'

I

a device

IS

addressed as a llstener on the IEEE-488 bus a device 1s addressed as a talker on the IEEE-488 bus tlw SRQ lilie on ttie IEEE 488 bus

IS

set true the ATN line on the IEEE-488 bus is set true ttie REN hne on the IEEE-488 bus 1s set true

The two dlsplays on the front panel show IEEE-488

FRONT PANEL DISPLAY

bus data In

hexadecimal

format whenever the front

pmel Normallstep sw~tch

IS

In the STEP (up)

pos~f~ori

7Iit3 dlqpldys are turned off whenever the Normallstep swltch Is

In

the

NORMAL

(down)

pos~t~ori

The upper d~splay corresponds to brts 4 7 on the IEEE 488

d,rtd bus, and the lower drsplay to blts

0

3 of the bus

When the VX4521 is addressed as a

VXI

USEf? IFEBACE COMMANDS

Listener on the IEEE-488 bus, it will

recogn~re certain ASCII strings that WIII causc an actlor1 to occur or cause a response to be formatted and returned to the IEEE-488 controller the next time the VX4521 is addressed as a Talker on the bus.

The syntax and symbols used in the command descriptions are:

(

I

optlorial parameter

( )

grot~p of parameters

<CR>

carriage return (decimal 13. Its use is host-specific and it may not be

required as a terminator. Consult the host's Operating Manual.

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<

LF > l~ne feed (declmal

101.

Its use is host.specific and it may not be

required as a terminator. Consult the host's

Operating

Manual.

white space

-

blank and comma. Used to separate flelds in a coriini;~nd

containing multiple parameters.

LA

logical address

(1

-

255) of the VXlbus device to recerve the corwnand, In either ASCll decimal or hex notation. An ASCll hex riirrnl~er rnust be preceded by

'#H'

or '#li'.

All cornmands niusl terminate

with

a <CR

>

<LF

>.

81.10

DL

AD?

DL IS?

DNUR47

€NO

FDCREAD

F

DCWRITE

GRANT

HDLLINE

HDLMATRIX

!{ELI'

INS LINE

BNO LA

-

Issues the Beqn Normal Operat~orr cornor,irrtI to 111e ~ncl~cated

dev~ce (3

-

141

DLAD?

returns a lrst of the log~cdl addresses for all tlev~crs In the

VXI

systern.

(3

17)

DLIS? (LA) returns ~nforniatron on the dev~ces cor~ip~i~,~rrg

ttrt.

VXI

system. (3

-

181

DNUM?

-

returns the nmher ol dcvlccs

111

[lie VXl syst~!rii

(3

23)

EPJO LA - lsstles the End Nornial Operntrciri WSP r:or~t~iia~ttl

ro

tlic.

~r~d~cated deuce. (3 241

read data from a VXI servant's shared riieniory us111~j F.i:,r Daln

Cliarrnel prolocol. (3

.

25)

GRANT ComnianderLA ServantLA

-

the servanl dewce at loglcal address ServantLA will be granted to t11e coniriiander tlevtce at I<~g~c;il address Cornri~clnderLA.

(3

-

271

HDLLINE LA Handler returns the

VME

IHU lhrre assoc1.9r1:d w~tli tht:

specrfred interrupt Handler on devrce

I

A. 13 . 28)

HDLMATRIX

-

returns the Interrupt Iial~dler nralrtx rnalr~li~~ned ~~~rer~idlly

IJ~

the Resource Manager.

(3

-

291

INTLINE LA lriterrupter

returns the VMk IRQ Ilnc ,issot:~,~tt:d w~tli the

specifled lriterrupter on device LA. (3

-

311

INTMATRIX

LOCK

MAP

READINTS

RED

HEDB

REDBSETUP

RELEASF

RESET

SETIIDL

SRO

S7

ATUS

TABLE

TEST

TIMEOUT

1

INTMATRIX - returns the interrupter matrlx table maintained Internally

by the Resource Manager.

(3

-

32)

LOCK LA ('CLEAR')

-

sends the WSP cwirnands

Set

Lock or Clear Lock

to the indicated VXlbus device. (3

-

331

MAP LA IEEEAdr

-

specrfies 8 particular IEEE-488 address to be

associated

with

a partrcular Log~cal Address.

(3

-

34)

READHDLS LA

-

returns the ntrtnber ol interrupt Ircres the devicu

at

LA

rilay handle siniultaneously. I3 . 35)

READINTS LA

-

returns the number of interrupt lines the dev~ce at

LA

rimy drive simultaneously.

13

-

36)

RED

7,

z,

2,

z6

-

reads VME nieniory space. 13

37)

REDB cxccules tlre VMEbus last b~nary rcads.

(3

-

39)

REDBSETUP

z,

z2

z,

-

sets up the VX4521 for fast blnary VMEbus

reads. (3

-

401

RELEASE ComnlanderLA ServantLA

the servant dev~ce at log~cal

address ServantLA

IS

released from the commander devrce at logical

address ComnianderLA.

RESET

(1

A1

('SAFE']

cesets a selected VXI device. 13

-

42)

SETHDL LA Handler IRQ ('send')

-

updates 11le Interrupt Hsridler Matl~x

tdllie in (ha Reso~rrce M,~nnger. (3

-

44)

SFTINT LA Irilt:lrup!er IRQ ('send')

allows the Interrupter Matrix table

In

the Resource Manager to be modlfied and optionally cause the

Interrupt trrerarchy to be modified to march the rnatrix.

(3

-

461

SRU ('CLEAR')

-

enables or ~~Is~IOIL'S the geric:ratlori

ol

IEEE-488 SRQs

wlicl~cver the VX4521 detects an error. (3

-

48)

Sl

ATUS

(LA) - returns the current error status of a VXI device.

(3

-

491

TABLE

-

returns the number of devrces and conf~guration informatron

for each devrce in the mainframe which it controls. (3

-

50)

7

LS1

cxecules the 0~11lt

111

SO/(

test ~ouli~re. (3 - 52)

TIMEOUT (2)

-

assigns the ornount of time the VX4521 waits for the assertion of the Reed Ready andlor Write Ready bits in a device's Response register during WSP data transfers.

(3

-

53)

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Table

of

Contents

Section

1

General Information and Specifications

Introduction

......................................................................

1

.

1

Controls And Indicators

............................................................

1 . 2

Switches

....................................................................

1

3

.

Fuses

.......................................................................

1

.

5

LEDs

................................................................

1 . 5

FrontPanelDisplay

................................................................

1

.

6

.

.....................................................................

Specifications

1

9

Section

2

Preparation For Use

.

Installation Requirements And Cautions

..............................................

2

1

.

Installation Procedure

..............................................................

2

.

Installation Checklist

...............................................................

2

4

Section

3

.

Operation

.

Overview

.........................................................................

3

1

Power-up

.........................................................................

3

.

2

.

Module Operation

.................................................................

3

2

...........................................................

ResourceManager

3-

2

.

..............................................................

SlotOFunctions

3

5

IEEE-488lnterface

............................................................

3

-5

.

VMEbus System Functions

....................................................

3

6

.

IEEE-488 Control Lines

........................................................

3

7

.

IEEE-488 Bus Commands

.....................................................

3

8

.

System Operation

...........................................................

3

10

.

VXI User Interface Commands

...........................

,

....................

3

11

Triggercommands

..........................................................

3

.

60

.

ErrorHandling

..........................................................

3

73

Section

4

Programming Examples

Definition of BASIC Commands

.....................................................

4

.

1

.

Programming Example In BASIC

....................................................

4

2

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Table

of

Contents

Appendices

.

Appendix A . VXlbus Operation

....................................................

A

1

.

Appendix

B

Input/Output Connections

.............................................

A

3

.

Appendix

C

.

VXI Glossary

........................................................

A

5

.

Appendix

D

.

Shifting Method

.....................................................

A

13

.

Appendix

E

.

User Service

........................................................

A

15

List

of

Illustrations

.

Figure

1

:

VX4521

Controls and Indicators

............................................

1

7

Figure

2:

Front Panel

..............................................................

1

.

8

Figure

3:

Typical System Hierarchy

..................................................

3

-

4

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Safety

The general safety information in this summary is for both operating and servicing personnel. Additional specific warnings and cautions are found throughout the manual where they apply, and may not appear in this summary.

Summary

TERMS

In This Manual

WARNING statements identify conditions or

practices that could result in personal injury or loss of life.

CAUTION

practices that could result in damage to the module or other property.

Marked on the Module

DANGER

immediately access~ble as one reads the marking.

CAUTION indicates a personal injury hazard not immediately accessible as one reads the

marking, or a hazard to property, including the module itself.

statements identify conditions or

indicates a personal injury hazard

SYMBOLS

Power Source

This module is intended to operate in a mainframe whose power source does

250V

not apply more than the supply conductors or between either supply conductor and ground.

protective ground connection through

the grounding conductor in the power

cord(s) is essential for safe operation.

rms between

Grounding the Module

This module is grounded throuah the

grounding conductor of the mainframe power cordls). To avoid electrical shock, plug the mainframe power cordts) into a properly wired receptacle before connecting to the module

A

connectors. connection through the mainframe is essential for safe operation.

protective ground

Danger Arising from Loss of Ground

Upon loss of the protective-ground connection, all accessible conductive parts can render an electric shock.

A

In This Manual

I

:

-

a

Marked on the Module

k

-\

-

\s/

h

A

0

This symbol indicates where applicable cautionary or other

information is to be found.

This symbol indicates where special explanatory information is

included in the manual. There is

no caution or danger associated

with the information.

DANGER

Protective ground (earth) termmal. ATENTION - Refer to the

manual.

Refer to manual before using.

-

High Voltage.

Use

the Proper Fuse

To avoid fire hazard, use only fuses specified in the module parts list. A replacement fuse must meet the type,

voltage rating, and current rating

specifications required for the fuse that

it

replaces.

Do Not Operate in Explosive

Atmosphere

To avoid explosion, do not operate the

module in an explosive atmosphere.

Do Not Remove Covers or Panels

To avoid personal injury, the module covers should be removed only by qualified service personnel. Do not

operate the module without covers and panels properly installed.

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Advanced

Resource

Manager

Introduction

The VX4521 Advanced Resource Manager Module is a printed circuit board assembly for use in the slot such as the VX1400 to the VXlbus System Specification for a Resource Manager, Slot 488 lnterface Device for a C size module. The VX4521 performs three functions critical to the proper operation of a VXlbus system:

1)

2)

Section

General

and

0

position of a mainframe conforming to the VXlbus Specification,

C

size mainframe used in the Tektronix IAC System.

it is the VMEbus system controller required by the VMEbus Specification;

it prov~des both the VXlbus Resource Manager and Slot 0 functions required by

the VXlbus Specification;

Information

Specifications

It

conforms

0

Device, and IEEE-

1

it acts as the communications interface between the station computer and the

3)

VXlbus chassis (VX1400 Mainframe) using the iEEE-488 General Purpose

lnterface Bus.

As

the VMEbus Controller, the VX4521 Module provides the bus arbiter, interrupt daisy

chain driver, bus time out, and system clock driver.

VX4521

the

knowledge is necessary to operate the VX4521 or any VXlbus system in which installed. The IEEE publication IEEE operation.

The Resource

located at logical address system reset to allow individual IAC modules time to perform any required setups and self tests, the Resource Manager initializes the system and identifies all VXlbus devices in the system. It then

each device, ~ncluding self test passlfail results, slot location, manufacturer

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makes

all

VMEbus operations transparent to the user, no VMEbus

101

4 (1

987)

Manacler portion of the module is a VXlbus message based instrument

0.

After a maximum five second delay following power-up or

builds a configuration table that contains status information for

It is also a VMEbus master. Since

offers more information on VMEbus

ID,

it

is

model

Section

1

code, and other system information. The table may be up-loaded to the station controller through the IEEE-488 interface.

The Resource Manager also configures

.--

system address maps, sets up the commanaer/servant hierarchies for the system, and then initiates normal system operation.

The VX4521 Resource Manager conforms to the VXlbus Specification Version

1.3

and

can support VXI devices implementing either the

1.2

or the

1.3

version of the VXlbus

Specification.

The slot

0

functions include a

10

MHz

different~al

ECL

clock driver for the backplane

(CLKIO),

and transceivers for the MODlD lines.

The IEEE-488 Interface portion of the VX4521 Module converts IEEE-488 protocol to

VXlbus instrument protocol.

It routes the incoming

IEEE-488 instructions and data to the proper instrument (IAC module) in the ma~nframe and returns instrument responses to the IEEE-488 bus controller. It can also be switch selected to allow the VXIbus svstem to either assign each IAC module its own IEEE-488 primary address (multiple primary addressing), or to assign the overall system

a

single IEEE-488 address and each of the IAC modules a secondary address (single prlmary with multiple secondary addresses).

The VX4521 Module will execute a self test at power-up, on direction of a VXlbus hard

reset, or on command.

A

VXlbus hard reset cccurs when the Reset switch on the

module's front panel is depressed, asserting the backplane line SYSRST*.

The VX4521

can initiate a VXlbus soft reset in any VXlbus module in the chassis under command of

the system controller.

V

The VX4521 also has extensive trigger control capabilities. Under user control, the trigger control circuitry can:

transparently pass trigger signals from one trigger line to another,

route

trlgger signals to and from the front panel external trigger spigots,

h

generate trigger events,

t

force the synchronizat~on of an output trigger event to the rising edge of the VXlbus

CLK10

signal, convert an Input trlgger event to a s~ngle output signal of a different pulse width, convert a single input trigger event to a delayed output signal or a pulse train of variable frequency, with each output pulse

200

ns wide, and convert a single input trigger event into a continuous square wave of variable frequency.

Controls And Indicators

The following controls and indicators are provided

to

select and display the functions of

the VX4521 Module's operating environment. See Figures

1

and 2 for their physical

locations.

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Switches

IEEE-488 Address Switches

Section

I

L&WL

ADORES

--

HM

ra3

~50

The VX4521 has two hexadecimal rotary switches which determine either the

primary IEEE-488 address of the mainframe and/or the IEEE-488 address of the VXlbus Resource Manager. This is discussed more fully in the paragraph on

the Configuration swrtch.

M

L

L.

S

0

D

A

1

5

Base Phys~cal

Addr.

(d) (64.10) +49l52 = 49792d (64*21)+49152

L.A.

=

iogical Address

MSD

=

Most

Least

LSD

=

50496d

Sigmflcant Digit S~gnif~cant Digit

A.

D

Ah

15h

where:

Confisuration Switch

Setting this eight-position rocker switch determines the type of IEEE-488 addressing to be used (switch on error conditions (switch

(switch

31,

and which VMEbus arbitratron level will be used when the module is

acting as a Master of the VMEbus (switches

11,

whether or not the VX4521

21,

the type of IEEE-488 mapping algorithm to use

7

and 8). The settings of the eight

rockers are as follows:

will

generate SRO's

=

open

closed each

If switch

IEEE-488 primary address for each VXI logical address in the mainframe.

=

one primary address for the mainframe with a secondary address for

VXI

logical address in the mainframe.

1

is closed, then the two rotary switches on the VX4521 determine the IEEE-488 primary address for the entire mainframe. The VX4521 'S IEEE-488 secondarv address will be

30.

The standard type of IEEE-488 addressing is described in the O~eration section, and the shifting method in Appendix

2

-

SRO

Generation on Error Detection:

open

=

IEEE-488 Bus Service Request (SRQ) generated when the VX4521

D.

detects an error. See the Error Handlinq section for possible sources of errors.

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Section

7

closed = SRQ generatlon on error detection is disabled.

instruments in the system may still generate an SRQ by sending the VXlbus Request True event to the VX4521.

3

-

IEEE

Address M~DD~~Q Alaorithm:

closed

method.

open method.

These two methods are described in the Ooeration section.

7

and

8

These two switches determine which VX4521 when the required Bus Request levels is:

=

the

iEEE

address is mapped to the logical address using the direct

=

the IEEE address is mapped to the logical address using the shifting

-

VMEbus Arbitration Level:

Bus

Request level will be used by the

it

requests use of the VMEbus. The setting of rockers 7 and

Rocker Rocker

7

-

closed closed

closed

open closed

open

8

open

Level

0

1

2

3

However, other

8

for

El

Ill-ePRuPT

4"OLEil

VMEbus Interru~t Handler Level Switch:

This

BCD

rotary switch deterrnlnes wh~ch IRQ line on the VMEbus w~ll be mon~tored

by

the VX4521. If the switch IRQ line will cause the lnterrupt Handler to execute. Any other settmg wiil cause the Interrupt Handler to be disabled.

IRO

line goes true are described In the O~eration section of this manual under

Interrum

If

an instrument VX4521, then the interru~t level chosen for the servant's interrupt ievels must be the same.

Note that the lnterrupt Handler may be disabled by setting the switch to any number other than

Reset Switch

This momentary switch on the front panel is labeled

system-level reset. Pressing the switch generates the VMEbus' system-reset signal

Handler.

in

1

through

the mainframe uses VMEbus interrupts and is a servant of the

7.

IS

set from 1 through

The actions taken by the VX4521 when the selected

7,

VX4521

RESET,

then the correspondlng VME

interrupt handler and its

and is used to perform a

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Section

7

(SYSRESET') on the VMEbus backplane, and also resets the VX4521 Module's

on-board microprocessor. Pressing this switch causes a VXlbus hard reset.

-

=

-

i

=.

,

I,lx

lo

mtwtrt~~

InternalIExternal

This red double-pole double-throw rocker switch has two positions, labeled

C2. When the switch is CLK10 on the backplane. When the sw~tch is

CLKl

0

in

the

C1

position, the on-board oscillator is used to drive

in

the

C2

position, the internal

C1

and

oscillator is disconnected from the backplane driver and the SMB external clock

connector on the front panel is connected to the backplane driver.

IEEE-488 Sinsle-ste~ Switch

This front panel 3-position toggle switch is labeled NORMAL (down position), and

(momentary-up position).

It allows the VX4521 Module to act

as

an IEEE-488 bus

STEP

monitor.

When the switch is set to the speed. When the switch

NORMAL

is

set to the center position, the VX4521 Module does not

position, the IEEE-488 bus runs at its normal

complete IEEE-488 handshaking of the NDAC line for the current IEEE-488 bus cycle

until the switch is pressed to the STEP position. At that time, the bus handshaking is

completed and data from the next bus cycle (when it occurs) is latched into the display.

Bus data is stepped one byte at a time when the Single-step switch is pressed. This feature allows single stepping of the IEEE bus even if the instrument addressed is not

in

the VX1400 Mainframe.

Fuses

LEDs

Each of the

VX4521 power buses is protected with an on-board fuse to protect other

modules within the VXlbus chassis in the event that an inappropriate voltage is applied

The

to this module's front panel connector.

fuse also protects the module in case of an accidental shorting of the power busses or any other situation where excessive current might be drawn.

If any of the fuses open, the power

The VX4521 Module has fuses for

LED (PWRI

+

5V, -5.2V and -2V.

on the front panel will turn off.

If any of the fuses opens, remove the fault before replacing the fuse. Replacement fuse information is given in the S~ecifications section of this manual.

The following

are visible

at

the top of the

VX4521

Module's front panel to

LEDs

indicate the status of the module's operation:

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Section

7

POWER

When on the backplane: 5V, present.

SYSFAIL LED

This red LED is

whenever a module in the mainframe asserts the VMEbus backplane signal SYSFAIL*, including during self test. a self test or loss of a power rail. The VX4521 will also light this LED if failure of a module due to a breakdown of communications, even if the SYSFAIL* signal

is unasserted. Reading the status of the VX4521 will extinguish this LED.

MESSAGE LED

When master or is currently being accessed as a VMEbus slave. The LED appears to stretch the length of the VMEbus cycle. For example, a five microsecond cycle will light the LED for approximately constantly addressed or is constantly accessing the VMEbus.

LED

lit,

this green LED indicates that the following power supply voltages are present

+

5,

-5.2.

and

-2.

+

24, -24,

-5.2V,

or -2V fuses opens, or if any of the other power supply voltages are not

lit

during the five second self test period following power-up and

lit,

this green LED indicates that the VX4521 is either accessing the VMEbus as a

0.2

+

12,

-1

2,

VX4521 Module failures include failure to correctly complete

seconds. The LED will flash if the module is being

This LED

will

go out if the

it

detects a

ADDR STROBE LED

This green LED indicates VMEbus activity by monitoring Address Strobe (AS') on the

VMEbus. which system component is acting as the bus master. As the duty cycle of AS* increases, the LED will become brighter.

Front Panel Display

The 4-digit display on the front panel shows IEEE-488 bus data in hexadecimal format on the two right-most digits and in ASCII format on the left-most digit. digit from the left will display a "T" when the VX4521 or currently addressed as Listener. An "S" will be displayed if an SRQ is pending for any card in the mainframe.

N

0

TE:

It

is lit whenever any type of VMEbus cycle is in progress, regardless of

The second

a

card in the mainframe is

a

The

Talker on the IEEE-488 bus, or an

"S"

will override the "T" and the

"L".

"L"

will be displayed for a

-

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'V

Rfi

Figure

7:

VX452 1 Controls

and

indicators

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Section

1

-0VINCED

1

MANAGER

I

Figure

2:

Front

Panel

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Section

Specifications

Functions:

VXI Resource Manaaer:

Device Type: Message based device.

VXI Resource Manager, Slot IEEE-488 interface device.

1

0

functions, VMEbus controller, and

Registers:

Logical Address:

Capability:

0

Slot

Functions:

MODID Lines:

Keying:

VMEbus

Funct~ons:

ID. Device type. Status. Response. Data low. Signal.

Append~x

See

0

(may not be altered)

A

for definition of reglster contents.

The Resource Manager is fully compliant with the VXlbus

Specifications for a Resource Manager.

10

MHz

ECL

differential; 1 OH 1 16 type driver.

Pulled up by 16.9K ohms; lines may be driven and monitored.

The left side is keyed for

TTL signal levels.

Bus Master:

A24lD16.

Bus Slave: A1 6lD16.

Bus Arbiter:

Prioritized arbiter.

Bus Requestor: Fair requestor.

Arbitration Level:

Switch selectable to anv levei.

Svstem Reset: Driven by on-board power-up monitor, or

driven

by

front panel switch.

Interrupt Handler: Single level capability, switchable to any level.

-.

Bus Time Out

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(BTO):

100

ps.

IEEE-4881VXlbus Interface:

IEEE-488.1 Subsets

Supported:

Addressing

Capability:

Special

Capability:

IEEE-488 Throughput:

Section

SH1

Source handshake.

AH

1

Acceptor handshake.

1

TE6 Talker extended.

LE4 Listener extended.

SR1

Service request.

DCl Device clear.

DTI Device trigger. PPO Parallel poll.

Single prirnary/multiple secondary or multiple primary. Switch selectable. VX4521 has a unique IEEE-488 address and may be commanded and queried by the System Controller.

Single step. VX4521 may act 3s an IEEE-488 bus analyzer.

ps start-up (address change).

140

Listener:

Talker:

Triaaers:

External In:

External Out:

General:

Power Requirements:

Byte Transfer

Fast

Handshake F;~:tocol - 400 I< bytesisecond

Byte Transfer Protocol Fast Handshake Protocol Fast Handshake Protocol

Prct?col

=

250 I< byteslsecond.

=

120 I< byteslsecond.

=

180

I<

bytesisecond.

=

275 I< bytesisecond.

TTL Type Input.

50 Ohm line driver

EXT

IN

to

backplane

trigger lines

ITTLO-7,

unsynchronized to CLI<10 synchronized to CLI<10

(74S2403.

trigger

lines (TTLO-7,

ECL

0-1)

to EXT OUT:

=

80 ns maximum.

=

200 ns.

ECL

0-1

);

or backplane

All required dc power is provided by the Power Supply in the VXlbus mainframe.

Voltage:

Current (Peak

Module, I,,):

5.25

V

+5

Volt Supply:

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4.75 V dc to

dc.

Current (Dynamic Module.

Replacement Fuses:

I,,):

+

5

volt supply:

+

5.21

-2V

+

5V

Section

0.643

Littlefuse Littlefuse

I

P/N

A.

273004 273001

-

Cooling:

Temperature, Ambient:

Humidity:

Radiated Emissions:

Conducted Emissions:

Module Envelope Dimens~ons:

Dimensions. Shippmg:

Provided by fans in the VXlbus mainframe. The module will have temperature rise of

drop of 0.04 mm of

O°C to

-40°C to

Less than 95% Less than

Less than

Complies

Complies with VXlbus Specification.

VXI

13.9 in x

When ordered as part of and secured in slot 0 of the mainframe. When ordered alone. shipping dimensions are:

+

50°C, operating.

+

85OC, storage.

75%

45%

w~th VXlbus Specification.

size.

262

C

1.2

406

mm x 305 mm x 102 mm.

(16in

x 12in x4

<

1

O°C with

H,a

R.H.

non-condensing, O°C to +30°C.

R.H.

non-condensing,

R.H.

non-condensing, + 41

mm high, 352 mm deep,

in).

a

configured system, the module is installed

in).

1.5

litershec of air and a pressure

+

31

OC to + 40°C.

+

OC

31

50°C.

to

mm wide.

(10.3

in

a

x

Weight:

Weight, Shipping:

Mounting Position:

Mounting Location:

Front Panel Signal Connectors:

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1

kg.

(2.2

Ib).

pan

When ordered as

and secured in slot 0 of the mainframe. When ordered alone, shipping weight is:

1.5 kg. (3.2

Any orientation.

Installs only in the left-most VXlbus module slot (slot

mainframe.

24

IEEE-488

SMB for external CLK10 input:

SMB

for external trigger input:

SMB

for external trigger output:

of a configured system, the module is installed

Ib).

0)

of the

Standard Connector.

TTL

levels.

lTL

levels.

m

levels driven by a

748140.

Software:

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Section

2

Preparation

For

Use

Installation Requirements And Cautions

Since the VX4521 Module performs the VXlbus Slot 0 functions, it must be installed in slot

0

of the mainframe being used.

In the VX1400 Mainframe, slot

0

is the left-most

slot. Setting the module's IEEE-488 Address switch and Configuration switch either

assigns each IAC module its own IEEE-488 primary address, or assigns the overall

system a single IEEE-488 address and each of the

IAC

modules a secondary address. Refer to the O~eration section for information on selecting and setting the VX4521 Module's IEEE-488 address.

Tools Required

The following tools are required for proper installation:

Slotted screwdriver set.

Note that there are two printed ejector handles on the card.

To

avoid installing the card incorrectly,

make sure the ejector marked

"VX452

1

"

is at the

G.

In order to maintain proper mainframe cooling,

unused mainframe slots must be covered with the

blank front panels supplied with the mainframe.

Based on the number of IAC modules ordered with a TektronixiCDS mainframe, blank front panels are supplied to cover all unused slots. Additional VXlbus

C

size single-slot and

C

size double-slot blank front panels can

be

ordered from your Tektonix supplier.

Verify that the mainframe is able to provide adequate cooling and power with thts module installed.

Refer to the mainframe Operating Manual

for instructions.

If the VX4521 is used in a VX1400 Mainframe, all VX4521 cooling requirements will be met.

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Section

2

Installation Procedure

The

VX4521

Module is a piece of electronic equipment and therefore has some susceptibility to electrostatic damage (ESDI. ESD precautions

must

be taken whenever the module is handled.

Record the revision level, serial number (located on the label on the top shield of the

VX45211,

and switch settings on the Installation Checklist.

Only

qualified

personnel should perform this operation.

Verify that the switches are set to the desired values.

Make

sure

power is off

in

the mainframe.

The module can now be inserted into slot

0

of the mainframe.

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Section

2

Figure

3:

Module Installation

5)

Cable Installation

lf the

A

73A-717

The of the mainframe. The end of the cable extending from the front of the cable tray

is terminated with an IEEE-488 connector.

If

an

If the module is being installed in a TektronixKDS VX1400 Series mainframe, route the cable from the front panel the bottom of the mainframe and out the rear of the mainframe.

The mainframe is interfaced to the system controller using a standard IEEE-488 cable to connect the IEEE-488 connector on the rear panel of the VX1400 Mainframe to the IEEE-488 interface connector at the system controller.

-

VX452 I is part

lnterface Cable

far end of the cable

interface Cable

of

is

a

configured system:

is

located

is

attached to the IEEE-488 connector at the rear panel

purchased separately:

in

the cable tray of the VX1400 Mainframe.

of

the module down through the cable tray

at

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Installation Checklist

lnstallation parameters will vary depending on the ma~nframe being used. Be sure to consult the mainframe Operating Manual before installing and operating the

VX4521

Module.

Revision Level:

Serial No.:

Mainframe Slot Number:

0

Switch Settings:

IEEE-488 Address Switch:

Configuration Switch:

Rocker

1

:

-

open

-

closed

Rocker

2:

-

open

-

closed

Rocker

3:

-

open

-

closed

Rocker

7:

-

open

-

closed

Rocker 8:

-

open closed

Interrupt Handler Switch:

InternaliExternal

CLK10:

-

c1

-

C2

Cable Installed:

Performed by: Date:

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Overview

Section

3

Operation

The VX4521 Module is a C size single slot VXlbus Message Based Word Serial instrument for use in slot Configuration Resource Manager, slot VMEbus system controller functions defined by the VXlbus Specification, Version

The VX4521 has registers that conform to the VXlbus Specification for Message Based

Devices. This set of message based address

As the VMEbus Controller, the VX4521 Module provides the bus arbiter, interrupt daisy chain driver, bus time out, and system clock driver. It is also a VMEbus master.

The Resource Manaaer portion of the module is a VXlbus message based instrument located at logical address initializes the system and identifies all VXlbus devices in the system. It then builds configuration table that contains status information for each device, including self test passlfail results, slot location, manufacturer ID, model code, and other system

information. The table may be up-loaded to the station controller through the IEEE-488 interface. The Resource Manager also configures system address maps, sets up the

commanderlservant hierarchies for the system, and then initiates normal system

operation.

0.

0

of a VXlbus system. The VX4521 contains a Dynamic

0

functions, IEEE-488 interface device, and

registers

0.

After power-up or system reset, the Resource Manager

is for the Resource Manager, at logical

1.3.

a

0

The slot

(CLK1

The IEEE-488 Interface portion of the VX4521 Module converts IEEE-488 protocol to VXlbus instrument protocol. It routes the incoming IEEE-488 instructions and data to the proper instrument to the IEEE-488 bus controller. It can also be switch selected to allow the VXlbus

system to e~ther assign each IAC module its own IEEE-488 primary address (multiple

primary addressing), or to assign the overall system a single IEEE-488 address and each of the IAC modules a secondary address (single primary with multiple secondary addresses).

The trigger control circuitry can:

r

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functions include a

01,

and transceivers for the MODlD lines.

(IAC

VX4521 also has extensive trigger control capabilities.

transparently pass trigger signals from one trigger line to another,

route trlgger signals to and from the front panel external trigger spigots,

10

MHz different~al

module)

in

ECL

clock driver for the backplane

the mainframe and returns instrument responses

Under user control, the

Section

3

generate trigger events,

8

force the synchron~zation of an output trigger event to the rising edge of the VXlbus

CLK10

signal, convert an input trigger event to a single output signal of a different pulse width, convert a single input trigger event to a delayed output signal or a

variable frequency, with each output pulse

200

ns wide, and

pulse train

convert a single input trigger event into a continuous square wave of variable frequency.

of

Following power-up or system reset, the memory. red FAILED message addressed as the VXI system.

Module Operation

Resource

Manager

The Dynamic Configuration Resource Manager is a VXI Message Based device at logical

address Manager begins to initialize the system and build a configuration table containing system information. The information from the table may be passed through the 488 interface to the system controller using the TABLE command described in the User Interface Command section of this manual.

The Resource Manager performs the following functions in the order given below after power-up or system reset:

1.

Identify all VXlbus devices in the system:

After a delay of five seconds, the Resource Manager attempts to read the ID register at each of the other 255 VXlbus logical addresses. occurs, then the device at that logical address is present and is added to the configuration table.

VX4521

will

perform a self test of on-board

The self test will last a maximum of five seconds. If any failure occurs, the

LED

will remam lit after the five second self test period, and an error

will

be sent to the system controller the next time the VX4521 is specifically

a

talker on the IEEE-488 bus. The Resource Manager will then initialize

0.

After a five second delay following power-up or system reset, the Resource

IEEE-

If no bus error

.-.r

2.

Acquire module information:

The Resource Manager determines slot location (using the MODID lines), Manufacturer

ID,

and Model Code for each device in the mainframe and adds this

information to the configuration table.

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Section

3.

Perform Sysfail Test:

If SYSFAIL is asserted, the Resource Manager attempts to determine the devicek) asserting SYSFAIL. Each device found to be asserting SYSFAIL is placed in the Soft Reset State with SYSFAIL assertion inhibited.

3

4. Configure the system's The Resource Manager establishes a system wide CommanderJServant control

hierarchy as described in the VXlbus Specification. This step includes sending

the GRANT DEVICE command to any commander in the mainframe that

responded to the READ SERVANT AREA query with a non-zero value. See Figure

3

for an example of a typical system hierarchy.

5.

Dynamic configuration:

Perform dynamic configuration of any VXI device that has its logical address set

255.

to device has its logical address set to 255.

6.

Configure the system's A24 and

The Resource Manager reads the address space requirements of each A24 and A32 device that was added to the configuration table. If an A24 or A32 device

is present and requires additional address space, then an offset is calculated so that no two devices' address spaces overlap. This value is written to the device's Offset register.

Dynamic configuration can only occur if no static configuration VXI

Commander/Servant hierarchies:

A32

address maps:

Foreign devices (with the exception

852

Adapter) are undetectable, since they do not contain VXlbus configuration registers, and cause address space overlap problems.

7.

VME

IRQ line allocation: VME Interrupt Request lines are first allocated to programmable interrupt handler devices. Then, any remaining lines are allocated to programmable interrupter devices. The rules for IRO line allocation are defined in the VXlbus Specification

1.3,

version

8.

Identify commander:

The Resource Manager sends the IDENTIFY

instruments in the mainframe which are servants VMEbus master capability. This allows devices to use VXlbus signaling rather

than interrupts for sending events and responses to the VX4521.

9.

Initiate normal operation:

The Resource Manager sends the BEGIN NORMAL OPERATION command to all the Message Based Devices the VX4521 controls, in order of increasing logical

address.

section C.4.1.5.

of

the

CDS

COMMANDER

of

73A-

may

command to all

the VX4521 and which have

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10.

Determine

Section

RSTB

and Lock command support:

3

The Resource Managers sends the Clear Lock and RSTB Word Serial Protocol commands

to

each message based device

it

controls.

If

the receiving device does not generate an Unrecognized Command error, the device is assumed to support the commands. This information is added to the Resource Manager's

device configuration array.

Figure

3:

Typical System Hierarchy

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Slot 0 Functions

The slot

are hidden within the Resource Manager. The slot

MHz

differential ECL clock driver for the backplane) and transceivers for the MODlD

lines.

IEEE-488 Interface

The IEEE-488 Interface converts routes the incoming IEEE-488 data to the proper instrument in the mainframe and

returns instrument responses to the IEEE-488 controller. It does not examine or parse any IEEE-488 data unless it is specifically addressed to the VX4521.

Section

0

functions required by the VXlbus are supplied by the VX4521 Module and

IEEE-488 protocol to VXlbus instrument protocol.

3

0

functions include

CLKlO

(a

10

It

The Configuration switch setting determines whether the direct or shifting method

be used. The shifting method is discussed in Appendix

DIRECT

IEEE-488 Multiale Primarv Address Maeeinq When positlon translated to VXlbus logical addresses as follows:

METHOD

1

of the

The IEEE-488 address of the VX4521 is determined by the setting of the two hexadecimal rotary switches on the VX4521 Module.

Logical addresses of VXlbus devices, from 488 primary address. If the logical address is 31 or greater, the VX4521 will assign IEEE-488 addresses in ascending order, filling In unallocated addresses in the address list. For example:

Module

Loqcal

Configuration

Address

switch is set

IEEE-488

Pr~mary

Aadress

1

w,

to

D.

IEEE-488 addresses are

30,

correlate directly to an IEEE-

will

With a logical address greater than the module to another slot may change the module's IEEE-488 address. This will

require changes to the user's application program.

It

is

recommended that the logical address chosen for each module be the same as the slot number, and that the IEEE-488 address selected for the Resource Manager be greater than logical address.

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12.

This will allow the module's IEEE-488 address to be the same as its

30,

adding another card to the mainframe or moving

Secrion

3

IEEE-488

When Configurati0:-i switch position

Sinale Primarv/Multiole Secondarv Address M~DD~Q

1

to VXlbus logical addresses as follows:

The IEEE-488 primary address for the rnamframe is determined by the setting of the two hexadecimal rotary

The VX452i

Module is au~omatically assigned secondary address 30. Any other

5,.

-itches

module given logical address 30 will be reassigned.

1

Logical addresses from

to 29 correlate directly to an IEEE-488 secondary

address. Logical addresses greater than in ascending order, filling in unaiiocated addresses examole:

Module

Loq~cal

Address Seconaarv Address

is set closed, IEEE-488 addresses are translated

on the VX4521 Module.

29

will be assigned secondary addresses

in

the address list. For

IEEE-498

VMEbus System Functions

As the VMEbus controller, the VX4521 prov~des the VMEbus-arbiter, system-clock driver, bus-timer, system-reset driver, interrupt-daisy-chain driver, and interrupt handler

functions:

1. Bus Arbiter: The bus arbiter arbitrates bus requests and grants the bus on four levels, through 3. Level 3 has the highest priority and level 0 has the lowest priority. If the level request, the bus arbiter initiates a bus clear. The VXlbus Specification requires that the "Fair Requestor" scheme be implemented by modules in the system.

2.

System-clock Driver:

The system-clock driver generates a 16-MHz 50% (nominal) duty-cycle signal. This clock has no fixed phase relationships with other VMEbus timing.

3.

Bus Timer:

The bus tlrner monitors all VMEbus data transfers and asserts the VMEbus signal

BERR*

negative transition

transition

of

the current bus master

if

a transfer takes longer than 100 ps. The timer is started on the

of

either Data strobe

of

either C .ta strobe.

is

lower than the level of the current bus

(DS1

or DSO) and reset on the positive

0

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Section

3

4.

Power-up Reset:

When power is applied to the VX1400 Mainframe, the VX4521 Module provides a VMEbus system reset for a minimum of

200

ms as defined

in

the VMEbus

Specification.

5, IACK (Interrupt Acknowledge) Daisy-chain Driver:

This circuitry complies with the VMEbus Specification for generating a falling

edge on the IACK daisy-chain driver each time any interrupt handler initiates an IACK cvcle.

6. lnterrupt Handler: The VX4521 Module contains an lnterrupt Handler that is enabled when the lnterrupt Handler switch is set for an IRQ level between 1 and

7,

as described in

the Interrum Handler Switch subsection.

The lnterrupt Handler will execute when the VMEbus IRQ line that matches the switch setting is active. The lnterrupt Handler performs the following functions:

a)

It performs a VMEbus Dl

6

interrupt acknowledge cycle to obtain the

STATUSilD of the interrupting device. The interrupting device will return a

16-bit code, where the lower e~ght b~ts contain the ID (logical address) and

the upper eight bits contain the STATUS (cause for interrupt).

b)

If the ID (logical address) is for

a

VXlbus Message Based Device, then step

c) is performed.

Otherwise, the interrupt handler terminates operation.

c) If the Status is a Response (bit 15 set to

01,

then the configuration table is

updated with that device's status. If the Status is an Event (bit 15 set to

11, then the event is handled as defined in the IEEE-488 Interface Device section of the

VXlbus Specification. If the event was a Request True, then

the IEEE-488

SRO line will be asserted.

IEEE-488 Control Lines

The VX4521 Module's implementation of indiv~dual follows:

EOI (End Or

ldentifvl

The VX4521 wiil set EOI on the IEEE-488 bu:

EEE-488 bus control lines is as

true when

it

receives data from

a card that was addressed to talk and the VXI end bit was set (bit 8 of the 16-bit data transfer is set to a

1).

SRQ (Service Reauestl The SRQ line on the IEEE-488 bus will be set true when the VX4521 receives the Request True event from a servant which it controls. It is

set

false when

it

receives the Request False event from that same servant only if no other servant has sent the Request True event.

The

VX4521 also generates the SRQ signal on error occurrence, if enabled to do

so. The VX4521 can be enabled to generate SRQs on errors in two ways:

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Section

3

a) with the SRQ command, or

b) with the VX4521 Configuration switch, which can set the initial mode of

SRQ

generation following power-up.

If the Configuration switch rocker

#2

is open, SROs will be generated whenever an error is detected. If the Configuration switch rocker #2 is closed, SROs are not generated on errors. This initial setting for the generation of

SROs can be

modified during operation with the SRQ command.

IFC (Interface Clear) When the bus controller asserts the IEEE-488 bus IFC line, the

1EEE-488 interface on the VX4521 Module goes into a quiescent state and is unaddressed as an active talker or listener. The IFC line is intended to clear the IEEE-488 interface. and therefore servants

of

the VX4521 are not affected by the IFC line going true.

DAV (Data Valid) lmplemented per IEEE-488 Standard, 1978

NRFD (Not Readv For

Datal

lmplemented per IEEE-488 Standard, 1978.

NDAC (Not Data Acce~tedl lmplemented per IEEE-488 Standard, 1978.

REN (Remote Enable) lmplemented per IEEE-488 Standard, 1978.

ATN (Attention1

lmplemented per IEEE-488 Standard, 1978.

IEEE-488

Bus Commands

The IEEE-488 Specification refers to multiline messages which can be used to obtain

predefined uniform actions from bus instruments. Multiline messages are commonly referred to as "universal" commands and "addressed" commands. These commands

can only be sent to individual bus instruments by the bus controller (station computer)

when the ATN (attention) line on the bus is true.

The VX4521 response to these

messages is as follows:

Universal Commands Device Clear

(DCL)

-

When the DCL command is received, the IEEE-488 interface device

sends the VXlbus

CLEAR

command to all VXlbus instruments which are its direct

servants. The CLEAR command is sent using the Word Serial protocol.

Serial Poll Enable (SPE)

-

Polling is a method the IEEE-488 bus controller uses to

determine which instrument on the bus has requested service. When the

SPE

command is received, the

VX4521

enters the Serial Poll Active State (SPAS).

If

secondary addressing is being used, the system controller

musf

be capable of a

serial poll using secondary addresses.

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Section

3

Once the serial poll begins, the VX4521 may respond depending on the capabilities of the VXlbus module requesting service.

1. IF the IEEE-488 controller places a Talk address on the bus,

AND

that Talk address

AND that instrument is IEEE-488.2 compatible

STB

command,

THEN the VX4521 will send the VXlbus READ STATUS

that instrument.

The VX4521 then reads the status byte of that instrument (using the Word

Serial Protocol) and returns it to the IEEE-488 controller.

2. IF the IEEE-488 controller places a Talk address on the bus,

AND

that Talk address & for an instrument in the mainframe AND that instrument is not IEEE-488.2 compatible AND does not respond to the READ THEN IF that instrument is the one that sent the Request True event to the

VX4521,

THEN the VX4521 will return a hexadecimal 40 to the IEEE-488 controller

6

set), or

(bit

ELSE an ASCII null (hex

for an instrument in the mainframe,

STB

command,

0)

is

returned to the controller.

in

one of two

OR

responds to the READ

ways,

BYTE

command to

Serial

Poll Disable (SPD) the IEEE-488 SPAS state and return to the IEEE-488 idle state. occur for the instrument which sent the Request True event to the

no other instrument has sent a Request True event to the VX4521, then the

line on the bus is set false.

Addressed Commands Group Execute Trigger (GET)

interface device sends the VXlbus

which are addressed to listen and have trlgger capability indicated by the Trigger

bit in their VXlbus Protocol register. The TRIGGER command is sent using the

Word Serial protocol.

hardware triggers when an IEEE-488 GET is received. Refer to the

Commands section.

Selected Device Clear

interface device sends the VXlbus CLEAR command to all VXlbus instruments

which are addressed to listen. The CLEAR command is sent using the Word

Serial protocol.

Service The SRQ line on the IEEE-488 bus is set by bus instruments whenever they require service from the system controller. If the SRQ is set true, the system controller will perform a serial poll to determine the cause of the SRO. The VX4521 will set the IEEE-

Request (SRQ) O~eration

-

When the SPD command is received, the VX4521

-

When the GET command is received, the IEEE-488

(SDC)

TRIGGER

VX4521 can also be programmed to generate VXlbus

The

-

When the SDC command is received, the IEEE-488

command to all VXlbus instruments

will exit

If a serial poll did

VX4521

SRQ

Trinaer

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488 bus SRQ line true, if enabled to do so by either the Configuration switch (rocker position

event from any of its servant modules in the mainframe. The Request True event may

be sent to the VX4521 with VMEbus interrupts or with VXlbus signaling.

The conditions under which modules generate Request True events are described in the

Operating Manual for the individual modules. when a serial poll occurs for the instrument which sent the Request True event to the

VX4521

System Operation

If a SYSFAIL occurs, the VX4521 will send a Sysfail Inhibit to each VXlbus device in turn. When SYSFAIL goes inactive, the Sysfail lnhibit as the source of the SYSFAIL. Once determined, the failed device is placed in the Soft Reset state with Sysfail assertion inhibited, as defined by the VXlbus

Specification.

Sysfail management has two phases: Power-Up Sysfail management and Runtime Sysfail management:

Section

2)

or the software command SRQ, when

and

no other instrument has sent a Request True event to the VX4521.

3

it

detects a VXlbus Request True

The VX4521 will set the SRQ line false

VX4521 identifies the device that last received

Power-up Sysfail Management:

If Sysfail is detected at power up, the VX4521 handles the situation as described above. That is, to inhibit it, and generates appropriate error messages.

Runtime Sysfail Management:

Runtime Sysfail management is more complex. If no V1.3 commanders are

present in the system, then Sysfail processing occurs as in a V1 .2 system (as

described above). If V1 .3 commanders are present, the resource manager waits

two seconds to allow the commanders to perform their required Sysfail

processing. If Sysfail is stdl asserted after two seconds, the VX4521 assumes

the device asserting Sysfail is not a servant of a V1.3 commander and attempts

to remove Sysfail, as

above.

Alternative Sysfail Management:

An alternative Sysfail interrupt handler can be installed that only inhibits the

generation of the Sysfail signal and does not place the device into the 'Safe

State'. This Sysfail management is useful during device development, debug or

whenever the user does not want a failed device placed into the 'Safe State'. The alternative Sysfail handler can be installed by issuing the following command to the VX4521: The alternative Sysfail handler remains in effect until the system is reset.

possible to reset the system and maintain the alternative Sysfail handler. See the

description of the Reset command.)

it

tries to determine which device is asserting SYSFAIL, then tries

descr~bed in the Power-up Sysfail management paragraph

0

"SetHdl

11 1 ",

where 0 is the logical address of the VX4521.

(It

is

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Section

VXI

User Interface Commands

.

The VX4521 has its own unique IEEE-448 address, as described subsection. recognize certain ASCII strings that will cause an action to occur or cause a response to

be

formatted and returned to the

addressed as a Talker on the bus.

When the

VX4521 is addressed as a Listener on the IEEE-488 bus,

IEEE-488

3

in

the Switches

controller the next time the VX4521 is

it

will

A summary of the VX4521 Module's commands is listed below This is followed by detailed descriptions of each of the commands.

The subset of Trigger commands is described separately

section, although they are used in the same way as these more general commands.

Command Action

BN

0

DLAD? returns

DLIS? returns information on the devices compris~ng the VXI system.

DNUM? returns the number

EN0

FDCREAD

FDCWRITE

issues the Begin Normal Operation command to the indicated device.

a

i~st of the log~cal addresses for all dev~ces in the VXI system.

of

devices in the VXI system.

issues the End Normal Operation

read data from a VXI servant's shared memory using Fast Data Channel orotocol.

write data to a VXI servant's shared memory using Fast Data Channel protocol.

WSP

in

command to the indicated device.

in

alphabetical order.

the Triauer Commands

GRANT

HDLLINE

HDLMATRIX

HELP

INTLlNE

specifies that the servant device at logical address ServantLA be granted to the commander device at logical address

returns the VME interrupt request line (IRQ) associated with the specified interrupt Handler on device LA.

returns the interrupt handler matrix maintained internally by the Resource

Manager.

returns help information on the user interface commands the Resource

Manager interprets.

returns the VME interrupt request line (IRQ) associated with the specified Interrupter on device LA.

CommanderLA.

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Section

3

INTMATRIX

returns the interrupter matrix table maintained internally by the Resource Manager.

LOCK

sends the Word Serial Protocol commands SET LOCK or CLEAR LOCK to the indicated

VXlbus device.

MAP

specifies

a

particular IEEE-488 address to be associated with a particular

Logical Address.

READHDLS

returns the number of interrupt lines the device at LA may handle simultaneously, i.e.

the number of interrupt handlers on that device.

READINTS

returns the number of interrupt lines the device at LA may drive simultaneously, i.e. the number of interrupters on that device.

RED

reads VME memory space

REDB

executes the VMEbus fast binary reads.

REDBSETUP

sets up the VX4521 for fast binary VMEbus reads.

RELEASE

RESET

SETHDL

SETINT

SRQ

STATUS

TABLE

TEST

TIMEOUT

specifies that the servant device at logical address ServantLA be released

I

from the commander device at logical address CommanderLA.

resets a selected VXI device.

updates the Interrupt Handler Matrix table in the Resource Manager.

allows the Interrupter Matrix table in the Resource Manager to be modified and optionally cause the interrupt hierarchy to be modified to match the matrix.

enables or disables the generation of IEEE-488

SRQs whenever the

VX4521 detects an error.

returns the current error status of a VXI device.

directs the VX4521 to return the number of devices and configuration information for each device in the mainframe which it controls.

causes the

VX4521 to execute its built-in self test routine.

assigns

the amount of time the VX4521 waits

for

the assertion

of

the Read Ready and/or Write Ready bits in a device's Response register during Word Serial Protocol data transfers.

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WRT

WRTB

writes to VME memory space.

executes the VMEbus fast binary writes.

WRTBSETUP

sets up the VX4521 for fast binary VMEbus writes.

WSCMD

WSCMD?

The syntax and symbols used in the command descriptions are:

<CR>

sends the specified Word Serial Protocol command to a VXI device.

sends the specified Word Serial Protocol command to a VXI device. The response value is returned in ASCll decimal format.

(

1

optional parameter

{

}

group of parameters

.

. .

optional repetition

Note that the

represents the carnage return character, decimal specific and it may not be required as a terminator. Consult the host's Operating Manual.

0,

{I,

and

...

characters are not part of the command.

13.

Its use is host-

<

LF

>

I,

white space

underlines

represents the line feed character, decimal it may not be required as a terminator. Consult the host's Operating Manual.

enclosed characters must be sent as ASCll cahracters.

used to separate fields in a command containing multiple parameters. white space characters are blank and comma.

the Logical Address parameter, represents the logical address the VXlbus device, expressed in either ASCll decimal or ASCII hexadecimal

notation. If an ASCll hex number is used, it must be preceded by

'#h'.

Data returned by the VX4521 to the system controller through the

488

bus is underlined in the examples that follow each command.

10.

Its use is host-specific and

(1

-

255)

'#HI

IEEE-

Valid

of

or

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Section

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Command: BNO (Begin Normal Operation)

Syntax: BNO LA<CR>

<LF>

Purpose: This command issues the BEGIN NORMAL OPEFiATlON Word Serial Protocol

command to tne device at logical address

LA.

Description: LA

represents the logical address

(1

-

255)

of the VXlbus device to receive the

command, expressed in either ASCll decimal or ASCII hexadecimal notation. If an ASCll hex number is used,

it

must be preceded by

'#H'

or

'#hl.

In most simple systems, this command would not be required.

The

VX4521

sends

a

BEGIN

NORMAL

OPERATION Word Serial Protocol command to each of

its direct message based servants followmg the power-up sequence. The

BNO

command would typ~cally

be

used to restart operation if an End Normal Operation

command had been sent to

a

module to allow reconfiguratlon of commander1

servant or Interrupt

hierarchies.

Example:

Errors:

BNO

14<CR>

<LF>

This sends the BNO command to the VXlbus device with a logical address of decimal

14.

If the selected device does not exist or is not a message based servant of the

-

VX4521,

an Invalid Logical Address error is generated.

If the device's Status register indicates that it has not passed (or completed) the

self test then a Device Has Not Passed Self Test error is generated.

If the device has its Sysfail Inhibit bit set, then

a

Device Has Sysfail Inhibited

error

IS

generated.

If

the device has its Reset bit set, then a Device

Is

In Reset State error is

generated.

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Section

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Command: BUSTIME (Assign IEEE-488 Bus Settling Time)

Syntax:

Bustime (488BusTime)

<

CR

>

<

LF

>

Purpose:

This command modifies the IEEE-488 bus settling time.

The

bus settling time

is

the minimum amount of time the 488 interface hardware will wait for the bus to settle between individual GPIB access cycles. The power-on default

GPlB

bus

settling time is 600 ns.

Description:

The optional parameter 488BusTime has two values, Slow and Medium. These values are entered as ASCII strings. The value Slow corresponds to a bus settling

time of

2.2

ps. Medium corresponds to

1.2

ps. If omitted, the parameter defaults

to a bus settling time of

600

ns.

The IEEE-488 bus settling time will be initialized to Fast (600ns) when the Resource Manager is hard reset. With soft resets, the user has the option of

maintaining

a

previously assigned bus settling time. See the RESET command

description.

Example:

Errors:

Bustime slow

<

CR

>

<

LF

>

This example would asslgn a

2.2

ps

IEEE-488 bus settling time.

Any parameter other than Slow or Medium will generate an Invalid Command error.

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Section

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Command: BUSTIME?

(IEEE-488 bus settling time Query)

Syntax:

Bustime?

<

CR

>

<

LF

>

Purpose: This command returns the current

GPlB

bus

settling

time.

Description:

This current IEEE-488 bus settling time is returned as one of three

ASCII

strings.

Slow

is

returned when

the

bus

settling

time is

2.2

ps.

Medium

is

returned

when

the settling time is

1.2

ps.

Fast 1s returned for a

600

ns settling time.

Example: Bustime?

<

CR

>

<

LF

>

This example shows the ASCII string 'Slow' being returned, indicating the current

IEEE-488 bus settling time is

2.2

ps.

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Section

3

Command: DLAD?

--

Syntax: DLAD?<CR>

cLF>

Purpose:

This command returns a list of the logical addresses for all

devices

in

the

VXI

system.

Descr~ption:

The command returns comma separated

ASCII

decimal integers

whose

values

will

range from 0 to

255

inclusive. The last decimal integer is followed

by

the

<

CR

>

<LF>

characters.

Example:

If the system has five

VXlbus devices, then the command

returns a list of the five devices' decimal logical addresses:

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Section

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Command: DLIS?

Syntax:

DLIS? (LA)

<

CR

>

<LC>

Purpose:

This

command returns information on a device(s) comprising the VXI system.

Description:

LA

represents the logical address

(0

-

255) of the VXlbus device to receive the

command, expressed in either ASCli :ecimal or ASCII hexadecimal notation. If an ASCll hex number is used,

it

must be preceded by

'#ti'

or

'#h'.

If the optional parameter, LA, is omitted, then information on all devices in the system is returned.

If

the logical address parameter is specified, then only information pertaining to the referenced device is returned. The individual fields of a particular device are comma separated. Fields of different devices are semi-colon separated. The returned data fieids are defined

as

follows:

device logical address:

ASCll decimal integer from

0

to

255

inclusive.

device commander's logical address:

ASCll decimal integer from

-1

to 255 inclusive.

-1

indicates this device has

no commander.

VXlbus manufacturer ID:

ASCll decimal integer from

0

to 4095 inclusive.

model code:

The manufacturer's defined model code, an ASCll dec~mal integer from

0

to

65535

inclusive.

slot number:

The device's slot number: an

ASCII

decimal integer from

-1

to the number

of

slots that exist

In

the cage.

-1

indicates the slot for this device is not

known.

slot

0 logical address:

ASCll decimal integer from

-1

tc 255 inclusive.

-1

indicates the slot

0

device for this module is not known.

device class:

Thre? ASCll characters, defined as one of the following strings:

(MEM),

(EXT), (MSG), or

(REG)

which represent the four device classes: Memory, Extended, Message Based, and Reglster Based, as defined by the VXlbus Specification.

memory space:

Three ASCll CHARACTERS, defined as one of the following strings:

(A1

6).

(A241,

(A32).

or

(RES)

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which represent the addressing modes of the device. RES is reserved for future VXlbus definition.

memory offset:

The base address of the A24 or A32 address

of

a

device.

This

value

will

be

expressed as an eight digit ASCll hex number using the IEEE-488.2 Specification

'#H'

format, and zero padded if necessary. A zero is placed

in this field if the device does not suppon A24lA32 addressing.

memory size:

The size of A24 or A32 address space used by the device. This value

will

be expressed as an eight digit ASCll hex number using the

'#HI

format, and zero padded if necessary. A zero is placed in this field if the device does not support A241A32 addressing.

passlfail:

Four ASCll characters, defined as one of the following strings:

(PASS), (FAIL), or

(

EXT).

Note that 'EXT' is preceded

by

a space character.

extended field

1

:

This field is up to 80 characters long and is reserved for future VXlbus use.

extended field

2:

This field is up to

80

characters long and is reserved for future VXlbus use.

extended field

3:

This field is up to

80

characters long and is reserved for future VXlbus use.

manufacturer specific comment:

This field is up to 80 characters long and is defined by the resource

manager manufacturer.

For the

VX4521,

th~s field may contain any of the

follow~ng comma separated, dev~ce oependent data:

device IEEE-488 address:

Two digit ASCll decimal integer,

01

to

30

inclus~ve.

TRIGGER:

ASCII characters "TRIGGER",

if

the device has trigger capability.

LOCI<:

ASCll characters

"LOCK",

if the device supports the Word Serial

Protocol Lock commands.

RSTB:

ASCll characters "RSTB", if the device supports the Word Serial Protocol Read STB command.

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Section

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Examples:

FOREIGN:

ASCll characters "FOREIGN" if the VX4521 detects the presence of a

non-VXlbus device.

Operational State:

ASCll characters "NORMAL" if the device is in the Normal Operation state. ASCll characters "CONFIGURE" if the device is

in

the

Configure state.

Foreign devices may contain blanks in some of the fields.

DLIS?

O<CR>

<LF>

This command requests ~nformation about the VXlbus device at logical address

0.

The following is a typical example

of

returned information:

Contains

000

-

1

4092

0452

1

00

000

MSG

A1

6

the device's logical address.

indicates the device has no commander, i.e. it is the Resource Manager.

the device manufacturer's VXlbus ID Code.

the device's model code.

the slot number of the device.

the logical address of the Slot

0

device for this module.

the VXI device class.

In

this example the device is a

Message Based Device.

indicates the type of memory the device can access.

In

this example the device is an A1 6 device, which can access

1

megabyte of VME memory.

the base address of A24 or A32 address space allocated by the Resource Manager to this device.

Since this is an

example of an

A1

6

device, this field is zero.

the size of the

A24

or

A32

memory required

by

this

device. Since this is an example of an

A16

device, this

field is zero.

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Section

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11

The next three fields are null fields, reserved for future VXlbus uses. The null fields are indicated

15

16

Examole

This command, without the optional

VXI devices in this mainframe. If the system contained two VXlbus devices, the logical address 0 device described in Example returned information might be as follows:

PASS

0

VER4.0

2:

1

DLIS?

indicates the device passed its built in self test.

by

comma separators.

the IEEE-488 address of this device.

the version of software being used. This field will only be shown for DLIS? 0.

Because this is the last field in the response,

<

CR

>

<

LF>

terminated with a

<

CR

>

<

LF>

LA

parameter, requests information about all

1

and a second device, then the

.

it

is

The first line of returned data is identical to the previously described example except that the version number does not appear, and the line terminates in semi-colon. This character indicates that there is at least one more line of device information still to be read. The second line of device information is interpreted as follows:

Field

-

1

2

3

4

5

6

7

Contains Fk~resents

127

000 the logical address of the device's commander; in this

4092

00535

04 the slot number of the device.

000 the logical address of the Slot 0 device for this module.

MSG

the device's log~cal address.

case, the system's Resource Manager.

the device manufacturer's VXI ID Code.

the device's model code.

the VXI device class. In this example the device is a Message Based Device.

a

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Section

3

8

9

11

The next three fields are null fields, reserved for future VXlbus uses. The null

fields are indicated by comma separators.

15

A24

#H00200000

#H00010000

PASS

04,RSTB,NORMAL<

indicates the type of memory the device can access.

this example the device is an

16

access

the base address of by the Resource Manager to this device. This device has been allocated memory location 200000 hex.

the size of the device. This device requires memory.

mdicates the device passed its built in self test.

the manufacturer's comment field. Based on the capabilities of this device, the following three device specific values in this field:

megabytes of VME memory.

A24

address space beginning at

A24

or

A32

CR

>

<

LF>

A24

device, which can

or

A32

address space allocated

memory required by this

65536

bytes of

VX4521

A24

returns the

A24

In

1.

the device's

2.

an indication that the device supports the Read

STB

Word Serial Protocol command.

3.

the operational status of the device.

Because this is the last field in the response, terminated with

IEEE-488

a

<

CR

>

address.

<

LF

>

.

V

it

is

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Command: DNUM?

Section

3

Syntax:

Purpose: This command returns the number

Description:

Example: DNUM?

DNUM?<CR>

The returned value is a single inclusive, terminated with

010

<CR>

The DNUM? command returns the ASCll decimal number there are ten VXlbus devices in the mainframe, in this example.

<LF>

<CR>

<LF>

ASCII decimal integer ranging from

<

CR

>

of

devices in the

<

LF>

characters.

VXI

system.

'01

O',

1

to

256

indicating that

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Section

3

Command:

EN0

(End Normal Operation)

Syntax:

EN0

LA

<CR>

<LF>

Purpose:

This command issues the End Normal Operation Word Serial Protocol command to the device referenced

by

LA.

Descr~ption: LA represents the logical address

(I

-

255)

of the VXlbus device to receive the command, expressed in either ASCII decimal or ASCII hexadecimal notation. If an ASCII hex number is used,

it

must be

preceded by

'#HI

or

'4th'.

This command is typically used to put an instrument in the Configure mode to

permit system level activities such as reconfiguring interrupt levels and commander/servant relationships.

Example:

Errors:

This example issues the Word Serial End Normal Operation command to logical device

#hOA.

If the selected device does not exist or is not a message based servant of the

VX4521,

an Invalid Logical Address error is generated.

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Section

3

Command:

FDCREAD (read data using Fast Data Channel protocol)

-

LA

<

CR

>

<

LF

Syntax:

Purpose:

Description: LA The logical address of the servant device.

Example:

Errors:

FDCREAD

This command returns data from a VXI servant's shared memory, utilizing FDC protocol.

This command issues the determine the location and size of the servant's shared memory. The command FDCLOAD? is then issued to initiate the data transfer. The servant's data is then returned utilizing the

header.

2

<

CR

>

FdcRead

This example would return shared memory data from the device at logical address

2.

The amount of data that is returned is device dependent and defined by a

count value in the

If the selected device does not exist or is not a servant of the Resource Manager, an Invalid Logical Address error protocol, a Device Does

<

FDC

>

ASCll commands FDCBASE? and FDCSIZE? to

FDC

protocol control bits in the FDC buffer

LF

>

header itself.

is

generated. If the device does not support FDC

Not

Support FDC Protocol error is returned.

ASCll

N

0

TE:

The FDC protocol driver was developed to support the TektronixiCDS

VX4820

instrument.

Digital Test Module. It is not guaranteed to work with any other

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Section

3

Command:

FDCWRITE (write data using Fast Data Channel protocol)

Syntax:

FDCWRITE

LA

<

CR

>

<

LF

>

Purpose:

This command sends data to

a

VXI

servant's shared

memory,

utilizing

FDC

~rotocol.

Description:

LA

The logical address of the servant device.

This command issues the ASCII commands FDCBASE? and FDCSIZE? to determine the location and size of the servant's shared memory. The ASCII command FDCLOAD is then issued to initiate the data transfer. The servant is

sent data utilizing the

FDC

protocol control bits in the FDC buffer header.

Example:

Errors:

Fdcwrite

2

<

CR

>

<

LF>

.

...

data

..

.

This example would write shared memory data to the device at logical address

2.

The amount of data that is written

IS

def~ned by a count value written to the FDC

header by the commander device.

If the selected device does not exist or is not a servant of the Resource Manager, an Invalid Logical Address error is generated. if the device does not support FDC protocol, a Device Does Not Support FDC Protocol error is returned.

NOTE:

The FDC protocol driver was developed to support the TektronixICDS

VX4820

Digital Test Module. It is not guaranteed to work with any other

instrument.

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Section

3

Command:

-..

Syntax:

Purpose:

Description:

GRANT

GRANT CommanderLA ServantLA

The Grant command specifies that the servant device at logical address

ServantLA be granted to the commander device at logical address CommanderLA.

The Grant command allows the user to reassign servants to commanders while the VXlbus Configure mode. On power-up, servants are usually automatically granted to commanders based on the servant area the commander specifies

has, and

reconfigurat~on.

CommanderLA is the logical address of the commander to be granted the servant. ServantLA logical addresses may be expressed in e~ther ASCll decimal or ASCII hexadecimal notation. If an ASCll hex number is used, it must be preceded

GRANT

This command would grant the device at logical address 6 as servant to the

device at logical address

(Grant a Servant)

<

CR

>

<

LF

>

consecutive

is

the logical address of the servant granted to the commander. Both

5

6<CR>

logical addresses of servants. This command permits user

by

'#H'

<LF>

5.

in

it

or '#h'.

Errors:

An Invalid Logical Address error is generated if no device is present at either of

the spec~fied logical addresses.

A

Device Is Not a Commander error is generated

device does not have commander capability.

A

Servant Belongs To Another Commander error IS generated if the specified

servant device belongs to another commander.

NOTE:

An Exceeding Servant Area Size warning message is generated if you try to grant more dev~ces than specified by the commander's servant area size; however, the GRANT command is still issued.

if

the specified commander

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Section

3

Command:

Syntax:

Purpose:

Description: LA

HDLLINE LA Handler

The HDLLINE command returns the VME interrupt request line (IRQ) associated with the specified interrupt Handler on device LA.

Handler

This command is used in conjunct~on w~th the Read Number of Handlers and

Modify Interrupt Handler Matr~x commands to modify or interrogate the interrupt handler hierarchy

This command is usually preceded by a Read Number of Handlers command

which returns the number of interrupt handlers on the device. If the device has two handlers, HDLLINE LA determine which IRQ lines each handler

(Read Handler Line)

<

CR

>

<

LF

>

the logical address

command, expressed in either ASCll decimal or ASCll hexadecimal notation. If an ASCll hex number is used, it must be preceded by '#H' or '#h'.

a single digit number from handler number. On a typical device with one interrupt handler, Handler would be equal

of

a

VXlbus system.

(1

-

255) of the VXlbus device to receive the

1

to 7 which specifies the interrupt

to

1.

1

and HDLLINE LA 2 commands could then be sent to

is

assigned to.

Example:

Errors:

If the returned value is IRQ lines.

HDLLINE

01

This command sends the Read Handler Line Word Serial Protocol command to a device at logical address

requesting which IRQ line the second handler is assigned to. The returned value

of

1

If the selected device does not exist or is not a message based device, an Invalid Logical address error is generated.

If the device does not support programmable interrupt handlers a Device Does Not Support Programmable lnterrupt handlers error is generated.

If the handler value is less than

device, an Invalid lnterrupt Handler error is generated.

6

2<CR>

indicates that interrupt handler 2 is connected to VMEbus interrupt line

0,

the specified interrupt handler is disconnected from all

<LF>

6

(that is known to have at least two interrupt handlers)

1

or larger than the number of handlers on the

1.

-

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Section

3

-

Command:

Svntax:

Purpose:

Description:

Example: HDLMATRIX<

HDLMATRIX

The

HDLMATRIX command returns rhe interrupt handler matrix maintained

internally by the Resource Manager.

This command is used in conjunction with the List Interrupter Matrix command to

determine the state

This

command will only report interrupt handlers of those devices that support the VXlbus Programmable Handler capability. For a complete description of the interrupt handier structure, any interrupt handlers configured with manual switch settings must also be included.

Response:

(List Interrupt Handler Matrix)

<

CR>

<

LF>

of

the interrupt structure in a VXlbus system.

CR

>

<

LF>

the

Resource Manager and

where:

LA

is

the logical address of the interrupt handler device.

NO.

is the interrupt handler number.

VME

IRQ is the

IRQ line associated with this interrupt handler.

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Section

3

Command:

Syntax:

Purpose:

Description: Cmd can be any command supported by the Resource M~nager.

Example: The command

HELP

<:

CR

>

<

LF

HELP

>

WRT<CR>

by

the Resource Manager

<LF>

<

CR

VME

a

parameter, a list of all

1s

returned. Seven

>

<

LF>

bus.

HELP (Cmd)

This command returns help information on the user interface commands the Resource Manager interprets.

When the HELP command is entered by itself, withoui user interface commands supported commands are listed per line, with no command parameters or description. If the optional parameter 'Cmd' is used, the formal definition of the specified command

with its various parameters and their definitions is returned.

would return ail of the following ~nforrnatlon:

WRT AdrChq AdrMod VMEAdr; Data

This command allows 16-bit data writes to the

AdrChg

AdrMod

VMEAdr

Data

-

increment, decrement or don't change write. Allowable values: I or

-

VME

address modifier. If ASCll hex is used, precede number

with "#H"

-

physical with

the actual data to be written. If ASCII hex is used, precede number with

VME

"#HU

address. If ASCll hex is used, precede number

"

#H"

i,

D

VME

or

d, or N or n.

address after each

-

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-

Section

Command: INTLINE (Read Interrupter Line)

Svntax:

Purpose:

Description: LA

INTLINE

The

with the specified lnterrupter on device

lnterrupter a single digit number from

This command is used in conjunction with the READINTS and SETINT commands to modify or interrogate the interrupt hierarchy of a VXlbus system. command number of interrupters on the device. If the device has two interrupters, an

INTLINE

each interrupter is assigned to.

LA

Interrupter < CR

INTLlNE command returns rhe VME interrupr request line (IRQ) associated

the logical address command, expressed in either ASCll decimal or ASCII hexadecimal

notation. If an ASCll hex number is used, it must be preceded '#HI

or '#hl.

number. On a typical device with one interrupter, this value would

be equal to

js

usually preceded by a READINTS command, which returns the

LA 1 and INTLINE

>

1.

LA 2 could then be sent to determine which IRQ lines

<

LF>

(1

3

-

255)

LA.

1

of the VXlbus device to receive the

by

to 7 which specifies the interrupt

This

-

Example:

Errors:

0,

If the returned value is lines.

This command sends the Read lnterrupter Line command to a device at logical

6

address second interrupter is connected to. interrupter

If the selected device does not exist or

Logical Address error is generated.

If the interrupter value is less than the device, an Invalid lnterrupter error is generated.

If the device does not support programmable interrupts, a Device Does Not

Support Programmable Interrupts error is generated.

(known to have at least two interrupters) requesting which IRO line the

2

is connected to VMEbus Interrupt line

the specified interrupter is disconnected from all IRQ

1

The returned value of

1.

is

not a message based device, an Invalid

1

or larger than the number of interrupters on

indicates that

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Section

3

Command: INTMATRIX (List Interrupt Matr~x)

Syntax:

INTMATRIX

<

CR

>

<

LF

>

Purpose:

The

INTMATRIX command returns the interrupter matrix table maintained

internally by the Resource Manager.

Description:

This command is used in conjunction

w~th the List Handler Matrix command to

determine the state of the interrupter structure in a VXlbus system.

This command will only report interrupters that support the

VXlbus Programmable Interrupters capability. For a complete description of the interrupter structure, any interrupters configured with manual switch settings must also be included.

Exarnole: INTMATRIX

<

CR

>

<

LF>

Response:

where:

LA

is the logical address of the interrupt handler device.

NO.

is the interrupt handler number.

IRQ

is the

VME

IRO

line associated with this interrupt handler.

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Section

Command: LOCK

3

-

Syntax:

LOCK LA ('Clear')

<CR>

<LF>

Purpose:

Description: LA

Examples:

This command sends the Word Serial Protocol commands Set Lock or Clear Lock

to the VXI device defined

If the optronal parameter 'clear' is not specified, the Set Lock command is sent.

If

The Set Lock and Clear Lock commands set and clear the Locked bit on a

message based VXlbus device. services is locked out.

Historically, in IEEE-488 systems the IEEE-488 interface used this capability to lock out control from a manual front panel on an instrument that was controlled both remotely via the IEEE-488 interface and locally controls.

Exam~le LOCK

This command sends the Set Lock command to the VXlbus device with the

logical address of decimal

by

the logical address

the logical address expressed

ASCll hex number is used,

the optional parameter 'clear' is specified, the Clear Lock is sent.

1

23<CR>

in

:

cLF>

(1

-

255)

of the VXlbus device to receive the command.

either ASCll decimal or ASCll hexadecimal notation. If an

it

must be preceded by

A

set Locked bit indicates that access from local

LA.

'#HI

or

'#h'.

with

front panel manual

23.

Errors:

Exam~le LOCK

This command sends the Clear Lock command to the VXlbus device with logical address

The specified device must be a servant Word Serial Protocol Lock command. be generated.

#H

2:

14

CLEAR < CR

hex

(20

decimal).

>

<

LF>

of

the VX4521 Module and support the

If not, an Invalid Logical Address error

will

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Section

Command: MAP

Svntax: MAP LA lEEEAdrcCR> <LF>

3

Purpose:

This command Address (LA).

Description: LA

IEEEAdr

At power-up the VX4521 Resource Manager assigns IEEE-488 addresses to VXlbus device logical addresses us~ng the algorithm described in the IEEE-488

Interface Device subsection of this manual. This command permlts the user to

change an IEEE-488 address for compatibility etc.

The MAP command

mode.

Use the TABLE command to determine the current logical address1lEEE-488 address mapping matrix before making any changes, and to verify the results

the MAP command.

associates

the logical address

a particular

(1

-

255)

IEEE-488

of

address with a partrcular

the VXlbus device to rece!vE one

bcr,ical

command, expressed in either ASCII decimal or ASCII hexadecimal notation. If an ASCII hex number is used, it must be preceded by

'#HI

or '#h'.

the IEEE-488 address to be mapped to the logical address. It

must

not be currentlv in use.

with

previously written software,

IS

valid in either the Configure or Normal VXlbus operation

of

Y

Example:

Errors:

MAP

145

9<CR>

<LF>

With this command, the VXlbus device at decimal logical address 145 is set to the IEEE-488 bus address of

9.

If the logical address is less than 1 or greater than 255, an Invalid Logical

Address error is generated.

If a VXI

there that is not a servant of the VX4521

device does not exist at the specified address, or a VXI device exists

address (i.e. a servant of another Commander in the VXI mainframe), then an Invalid Logical Address error is generated.

If

the IEEE-488 address is less than 1 or greater than

30

or if the IEEE-488

address is already assigned, then an lnvalid IEEE-488 Address error is generated.

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-

Command:

Syntax:

Purpose:

Description: LA

READHDLS (Read Number of Handlers)

READHDLS LA

This command returns the number of interrupt lines the device at simultaneously, i.e. the number

This command causes the Word Serial Protocol Read Handlers command to be

sent to the message based device at logical address LA. The response will ASCll decimal number between 0 and programmable Interrupt handlers.

The command is used in conjunction with the Read Handler Line and Modify lnterrupt Handler Matr~x commands to modify the Interrupt handler structure of VXlbus system.

<

CR

>

<

LF

>

LA

may handle

of

interrupt handlers on that device.

(1

-

255)

the logical address

expressed in either ASCll decimal or ASCll hexadecimal notation. If an

ASCll hex number is used, it must be preceded

of the VXlbus device to receive the command,

by

'#HI

or '#h'.

be

7.

If

the response is

0,

the device has

an

no

a

Example:

Errors:

READHDLS

07

<CR>

This command sends the Read Handlers Word Serial Protocol command to the device at logical address the capacity to handle interrupts on all seven VMEbus interrupt lines.

If the selected device does not exist or is not Logical Address error

If the device does not support programmable interrupt handlers a Device Does Not Support Programmable lnterrupt Handlers error

6

<LF>

6.

The returned value of 7 indicates that the device has

IS

generated.

a

message based device, an Invalid

IS

generated.

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Section

Command: READiNTS (Read Number of Interrupters)

<

CR

>

<

Syntax:

READINTS LA

LF>

3

Purpose:

Description:

Example:

Errors:

The READINTS command returns the number may drive simultaneously, i.e. the number of interrupters on that device.

the logical address

LA

expressed in either ASCll decimal or ASCll hexadecimal notation. If an ASCll hex number

The

command causes a Word Serial Protocol Read lnterrupters command to

sent to the selected

0

and

7.

If the response is

The command is used in conjunction with the READINTS and SETINT commands to modify the interrupter structure of a VXlbus system.

6

<

CR

READINTS

07

The example sends the Read lnterrupters Word Serial Protocol command to

device at logical address

the

capacity to generate interrupts on all seven VMEbus interrupt lines.

If the selected device does not exist or is not a message based device, an Invalid Logical Address error is generated.

>

(I

-

255)

of the VXlbus device to receive the command,

IS

used, it must be preceded by

LA.

The response wdl be an ASCII decimal number

0,

the device has no programmable interrupters.

<

LF

>

6.

The reyirned value

of

interrupt lines the device at

'#H'

or '#h'.

of

7

indicates that the device has

LA

be

between

the

-

If

the device does not support programmable interrupts, a Device Does Not

Support Programmable Interrupts error is generated.

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Section

3

Command: RED (Read)

Syntax:

RED

z,

2,

<

CR

>

<

LF

>

Purpose:

This command reads

VME

memory space.

Description:

The Read command requlres five parameters, separated by valid white space

characters.

After the

VX4521 receives this ASCll command string, it is then

addressed as a talker on the IEEE-488 bus. The IEEE-488 system controller

may

then begin inputting the results of the VMEbus reads. If the selected VMEbus address does not contain a device that returns DTACK, a VMEbus error is generated.

The

command parameters are defined as follows:

specifies whether the VME address for successive reads will be incremented, decremented,

or

remaln the same. There are three allowable

values for this field:

I (or

i)

-

for increment~ng the VME address

D

(or dl - for decrement~ng the VME address

N

(or n) - for a constant address

All VME address reads are 16-bit reads, and address ~ncrementing and decrementing modify the

VME

address reference by

t

2.

Any

z,

values

other than the three specified above will cause an Invalid Command error

to

be generated.

specifies the VME address modifier to be used for the read cycle. The field may contain any two digit number in

ASCII from

0

to

63

(3F

hex). If an

ASCll hex number is used, it must be preceded by

'#HI

or '#hl. Typical

address modifiers are #H29 for A1

6

address space and

#H39

for

A24

address space.

specifies the physical VME address to be used in the read cycle. The field may contain from one to six ASCll digits. ASCll hex numbers must be preceded by '#HI or '#h'. The address value is rounded down to a even value, if necessarv.

specifies whether the data returned to the system controller will be in ASCll decimal or ASCll hex format.

VMEbus

data returned as ASCII decimal is formatted as five dec~mal digits, padded with leading zeros; ASCll hex data is formatted as four hex digits, with leading zero padding. The allowable values for this field are:

H

(or

h)

-

for ASCll hex format

D (or d)

-

for ASCll decimal format

specifies the number of VMEbus reads that are to take place. This field must contain

a

number in ASCII from

1

to

50

(32

hex). ASCll hex numbers

must be preceded by '#HI or

'#ht.

Commas separate the individual

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Section

3

VMEbus

read data values.

A

<

CR>

<

tF>

character sequence will

be

sent

to the system controller at the end

of

the

read sequence.

Example:

RED

i

#h29

#hCOCO

H

4

<

CR

>

<LF

>

This command performs four VMEbus 16-bit data reads.

The

address modifier

field spec~fies

A1

6

address space. The VMEbus inrtial address

of

COCO

hex is

incremented between successive reads.

The

return data

is

formatted

as

ASCII

hex. After sending this command to the

VX4521,

the next time

the

VX4521

is

addressed

as

a

IEEE-488 talker the string shown above

will

be returned to the

system controller, where xxxx represents the actual VMEbus data, shown as four

ASCII

hexadecimal digits.

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Section

3

Command: REDB (Read Binary)

-

Syntax: REDB<CR>

<LF>

Purpose:

This command reads VMEbus memory space.

Description:

The REDB executes

VMEbus memory space reads according to the parameters

set up previously with the REDBSETUP command. The same parameters will be used for each REDB command until a new REDBSETUP command is issued. The

REDBSETUP and REDB pair of commands are optimized for throughput and provide a method of rapidly polling a specific VMEbus location.

Each 16-bit VMEbus data value is returned across the IEEE-488 interface as two

consecutive

unsigned 8-bit bytes. Bits Dl 5-08 of the

16-bit VMEbus data value

are returned in the first byte; bits D7-DO are returned in the second byte.

Example:

Errors:

REDBSETUP

n

ith39

#h200000 1

<

CR

>

<

LF

>

REDB<CR>

<LF>

000

1

When the REDB command is issued, the VX4521

reads one 16-bit data value

from address 200000 hex in A24 space. When the VX4521

is addressed as a

talker on the IEEE-488 bus, it returns the 16-bit binary data value

0001.

Note

that a

<CR>

<LF>

is not appended onto the end of the returned valuets). The

IEEE-488 EOI signal is asserted when the last byte of the last 16-bit data value has been sent across the 488 interface. The user's IEEE-488 Bus Controller must sense the IEEE-488

E01

signal to successfully execute binary reads.

IF REDB is issued without having previously issued

a

valid REDBSETUP command,

an Invalid Command error is generated.

If

the REDBSETUP command specifies a VMEbus location that does not contain a

device that returns DTACK, then

a

VMEbus Error

IS

generated.

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Section

3

Command: REDBSETUP (Read Binary Setup)

Syntax:

REDBSETUP

z,

<

CR

>

<

LF

>

Purpose:

This command sets up parameters for a read of VMEbus memory space.

Description:

The REDBSETUP command requires four parameters to set up the VX4521 for

fast binary VMEbus data reads.

The

parameters define

the

VMEbus address and modifier, how many VMEbus reads are to take place, and how that address is manipulated in successive VMEbus reads:

z,

specifies whether the VME address for successive reads will be incremented, decremented, or remain the same. There are three allowable

values for this field:

I

(or i) - for incrernenting the VME address

D

(or d) - for decrement~ng the

VME

address

N

(or n) - for a constant address

All VME address reads are 16-bit reads, and address incrementmg and decrement~ng modify the VME address reference by

+

2.

Any

z,

values

other than the three specified above will cause

an

invalid Command error to

be generated.

z,

specifies the VME address modifier to be used for the read cycle. The field

may contain any two digit ASCll number from

0

to

63

(3F

hex).

If an

1

ASCll hex number is used, it must be preceded by

'#HI

or

'#h'.

Typical

address modifiers are

#H29

for A1 6 address space and

#H39

for

A24

address space.

z,

specifies the physical VME address to be used in the read cycle. The field may contain from one to six ASCll digits. ASCll hex numbers must be preceded by

'#H'

or

'ti'h'.

The address value is rounded down to an even

value, if necessary.

24

specifies the number of VMEbus reads that are to take place. This field must contain a number in ASCll from

1 to 127

(7F

hex). ASCll hex

numbers must be preceded by

'#HI

or '#hl.

The actual VMEbus read does not occur

till

the REDB command

is

executed. Once the read parameters are defined, they remain valid until a new REDBSETUP command is issued.

Example:

REDBSETUP n

#h39

#h200000 1

<

CR>

<

LF

>

This example would set up the VX4521 to read one 16-bit binary value from

VMEbus address 200000 (hex) in A24 space. The actual VMEbus access and read would take place when the

REDB

command is issued. This minimizes first

byte overhead and maximizes VMEbus read throughput.

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--

Command:

Syntax:

Purpose:

Description:

RELEASE

RELEASE CornmanderLA ServantLA

(Release a Servant]

<

CR

> <

LF

>

The Release command specifies that the servant device at logical address

ServantLA be released from the commander device

at

logical address

CommanderLA.

CornmanderLA

logical address

of

the commander which has been granted the

servant.

ServantLA

logical address of the servant to be released from the commander.

Both logical addresses may be expressed in either ASCll decimal or

ASCII

hexadecimal notation. If an ASCll hex number is used, it must be preceded by

'#HI

or

'#h'.

The Release command allows releas~ng servants from their ass~gned commanders

while in the VXIbus Configure mode. On power-up, servants are usually automatically granted to commanders based on the servant area the commander specifies it has, and consecutive logical addresses of servants. This command permits user reconfiguration.

Example:

Errors:

This command is used in conjunction

w~th the GRANT command for restructuring

the hierarchy of the VXlbus system.

RELEASE

This example will release the servant at logical address

11

12<CR>

<LF>

12

from the commander

at logical address 1 1.

An Invalid Logical Address error is generated if no device is present at either of

if

the specified logical addresses or

either logical address specifies the VX4521

itself.

A

Device Is Not a Commander error is generated

if

the specified commander

device does not have commander capability.

A

Servant Does Not Belong To This Commander error is generated

if

the specified

servant device does not currently belong to the specified commander.

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Command:

Section

3

Svntax:

Purpose:

Description:

RESET (LA)('Safel) <cr> <If

This command resets either the entire VXI c'-assis or a selected

the logical address

LA

expressed in either ASCll dec~mal or ASCll hexadecimal notation.

ASCII hex number is used, it must be creceded by

LA

The omitted, the entire VXI mainframe (each device in the cage) is reset and the

system is re-initialized as though a hard reset had occurred. The only difference is that the VXlbus s~gnal SYSRESET is not asserted.

If an

the opt~onal 'Safe' parameter is not used, then the Reset bit of the device's

Control reglster remarns set for at least then clears to seconds before attempting any additional IEEE-488 bus activity.

If the optional 'Safe' parameter is specified, both the Reset bit and Sysfail Inhibit bit of the dev~ce's Control reglster are set true, and the device is placed in the

'Safe' state.

parameter is opt~onal.

LA

parameter is specified, and the device referenced is not the VX4521, and

After a device has been reset, the VX4521 waits for five

'0'.

>

VXI

device.

(0

-

255) of the VXlbus device to receive the command,

'#HI

or '#h'.

If specified, only the referenced device is reset. If

100

psec (but less then

300

psecs), and

If

an

(LA

=

01,

If the

LA

parameter references the VX4521 mainframe is reset, including the VX4521, but the 'Safe' parameter is not allowed. This is a special case of the Reset command, in which the following system control values are not re-initialized:

lnterrupt Matr~x Table. This table contains the current system interrupt

matrix, which lists devices are allocated to which commands). Issuing the Reset command and specifying the VX4521's logical address allows you to reset and re-initialize the system without losing the current interrupt matrix information. The non-zero interrupt matrix table is detected by the VX4521's Resource Manager during system initialization, and each programmable interrupter and int+-rupt handler device is automatically programmed with the matrix table values.

Ready

Timeout Value. This value specifies the amount of time the VX4521

will wait for the assertion of the Read Ready and/or Write Ready bits

during Word Serial Protocol. The power-up default value is five

seconds. This value can be modified with the Then issuing the Reset command and specifying the VX4521's logical address resets and re-initializes the system using the modified

wh~ch Interrupters

VME

each device in the

and

interrupt hanalers on which

IRQ lines (see Interrupt Control

Timeout command.

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Section

3

Timeout value. This provides a convenient way to accommodate devices w~th unusually slow

initialization

sequences.

SYSFAIL Interrupt Handler. Assert~on of the VXI signal SYSFAIL generates

an interrupt to the

VX4521's Resource Manager. It

is

the responsibility of the resulting Sysfail interrupt handler to process the Sysfail signal. The power-up default handler detects the device that is asserting Sysfail and places it in the 'Safe State' by settmg the

Sysfail Inhibit and Reset bits of the failed device's Control register, (as specified by the VXI Specificationi.

A

device in 'Safe State' cannot process Word Serial Commands and has very limited capabilities. This

situation

is not always desired, particularly during device development and debug. An alternative, more benign, Sysfail interrupt handler may be installed. See the section of the manual describing Sysfail management, Issuing the Reset command and specrfying the

VX4521's

logical address allows you to reset and reinitialize the system wlthout re~nstallrng the default Sysfail interrupt handler.

When a VXI device (other than the

VX4521)

IS

reset,

~t

IS

placed into the Conf~gure Substate Operatronal Mode. Eefore that device can again process Normal substate mode Word Serlal Commands, the Begm Normal

Operation

command must be sent to the device.

Examples: Examole

1

:

RESET

23<CR> <LF>

Errors:

This command toggles the Reset bit of the Control register of the device at logical address 23.

Example

2:

RESET

6

SAFE

<

CR

>

<

LF

>

This command sets the Reset bit and the Sysfall Inhibit bit In the Control register

of the device at logical address

6.

The device is placed in the 'Safe' state.

If a VXI device does not exist at the selected logical address, an Invalid Logical Address error is generated.

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Section

Command: SETHDL (Modify Interrupt Handler Matrix1

3

Syntax:

Purpose:

SETHDL

The SETHDL command updates the Interrupt Handler Matrix table in the Resource

Manager.

IRQ

Description: LA

Handler

IRO

Send an optional parameter. If the 'Send' parameter is included, then

line

LA

Handler IRQ ('Send')

It

associates the lnterrupt

in

the matrix table.

the logical address

command, expressed in either ASCll decimal or ASCll hexadecimal notation. If an ASCll hex number is used, it must be preceded by

'#HI

or '#h'.

a single digit number from handler number. On a typical device with one interrupt handler, Handler would be equal to

the VME indicates the interrupt handler is to be disconnected from the specified IRO line, and the table values for that out.

Word Serial Protocol Assign Handler Line command assign the specrfied interrupt handler to the specified IRQ line.

iRO

line in the matrix table. An IRQ value equal to

(1

<

-

CR

>

<

LF

>

LA,

lnterrupt Handler Number and the VME

255)

of the VXlbus device to receive the

1

to 7 which specifies the interrupt

1.

IRO

line are cleared

is

issued to

0

This command is used in conjunct~on with the READHDLS and HDLLINE commands to modify a VXlbus system's interrupt handler hierarchy.

IRO

The VMEbus specification only permits one interrupt handler per Assigning two different devices to handle the same IRQ will cause improper operation, sometimes subtle and hard to find problems,

Handler numbers can be assigned to devices at power-up, or by switch settings on non-VXlbus devices or VXlbus devices without programmable Handler capabilities.

This command should not be used without complete knowledge of the interrupt

structure of a system, including knowledge of any manual switch settable interrupt handlers not reported by the HDLMATRIX command. It may only be sent when the device is in the VXlbus Configure sub-mode.

This command is often required in situations where a VXlbus device with programmable handler capability is handling interrupts from a device without ~rogrammable interrupt capability. The resource manager has no knowledge the IRO line the interrupter is using and will probably not assign a handler to the correct line on power-up. This command permits the user to assign the handler to the desired IRQ line compatible with a switch setting on the interrupter.

in

a VMEbus system.

line.

of

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Section

3

Example:

Errors:

An alternative Sysfail interrupt handler can be installed that only inhibits the generation of the Sysfail signal and does not place the device into the 'Safe State'. This Sysfail management is useful during device development, debug, or whenever the user does not want a fa~led device placed into the 'Safe State'. The alternative Sysfail handler

can

be installed by

issumg

the

following command

to the

VX4521:

"SetHdl 0 11

1

".

The alternative Sysfail handler remains in effect until the system is reset. (It is possible to reset the system and maintain the alternative Sysfail handler. See the description of the Reset command.)

This example will connect the device at logical address 6's second interrupt

handler to VMEbus lnterruot line

3.

If

the selected device does not exist or

IS

not a message based device, an lnvalid

Logical Address error is generated.

If the device does not support programmable interrupt handlers,

a

Device Does

Not Support Programmable Interrupt Handlers error

IS

generated.

If the handler value is less than

1

or larger than the number of handlers on the

device, an lnvalid Handler error is generated.

If the IRO value is less than

0

or greater than 7 then an Invalid IRO error is

generated.

If the device is in the normal operation substate. an lnvalid Device Substate error is generated.

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Command: SETINT (Modify Interrupter Matrix)

Syntax:

Purpose:

Description:

SETlNT

The SETINT commana updates the Interrupter Matrix table in the Resource

Manager. It associai-.~ the device at LA, the lnterrupter Number on the device, and the to be modified to match the matrix.

LA

lnterrupter

IRQ the

'Send'

An IRQ value equal to specified IRQ line, and the table values for that IRQ line are cleared out.

This command is often required in situations where a VXlbus device is being used with a device with a switch set interrupt handler. knowledge of the IRQ line the handler is using and will probably not assign the interrupter to the same line on power-up. This command permits the user to assign the interrupter to the interrupt handler. It may only be sent when the device is in the VXlbus Configure sub-mode.

LA

Interrupter IRQ ('Send') < CR

VME

IRQ line in the matrix table. !t can also cause the Interrupt hierarchy

the logical address command, expressed

notation. If an ASCll hex number is used, it must be preceded by

'#H'

or 'Xh'.

the interrupter number on the device at the specified logical address.

VME

IRQ line ~n the matrix table.

an optional parameter. Word Ser~al Protocol Assign lnterrupter Line command is issued to assign the specified interrupter to the specified IRQ line.

0

indicates the interrupter is to be disconnected from the

(1

IRQ line compatible with a switch setting on the

> <

LF>

-

255)

of the VXlbus device to receive the

In

either

If

ASCll

the 'Send' parameter is included, then

declrnal or ASCll hexadecimal

The resource manager has no

-

Example:

Errors:

SETINT

This command will connect the device at logical address 6's second interrupt to VMEbus interrupt line

If the IRQ value is less than 0 or greater than 7 then an Invalid IRQ error

generated.

If the interrupter value is less than the device, an Invalid lnterrupter error is generated.

If the selected device does not exist or is not a message based device, an Invalid Logical Address error is generated.

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6

2

3<CR>

<LF>

3.

1

or larger than the number of interrupters on

IS

Section

3

If the device does

not

support programmable interrupts, a Device Does

Support Programmable Interrupts error

If the

device

is

generated.

is

in

the normal

operation

IS

generated.

substate,

an

Invalid

Not

Device Substate

error

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Section

3

Command:

SRQ

(Service

Request EnableIDisable)

Syntax:

SRQ

('Clear')

<

CR

>

<

LF

>

eneve

Purpose:

This command enables or disables the generation

of

IEEE-488

SRQs

wh

the

VX4521

detects any operational error.

Description:

The SRO command by itself enables the generation of SRO signals.

The

optional

ASCII parameter 'Clear' disables the generatlon of SRO signals. The command

Reauest

False event.

Examples: Example

1:

SRO<CR>

<LF>

This

command enables

Example

2:

the

g

SRQ

CLEAR

<

CR

>

<

LF

>

has no effect on SRO generation as caused

by

the VXI Request True or

eneration of

SRQ

signals when errors occu

This

command disables the generatlon of

SRQ

s~gnals on error occurrence.

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Section

3

Command: STATUS

--

Syntax:

STATUS (LA)

<

CR

>

<

LF

>

Purpose:

This command returns the current error status of a

VXI

device.

Description:

LA

the logical address

11

-

255)

of the VXlbus aevlce to receive the command, expressed in either ASCll decimal or ASCll hexadecimal notation. If an ASCII hex number is used, it must be preceded by '#HI or '#h'.

If the optional LA parameter

is

omitted, then the current error status of the VX4521 Module is returned. If the optional parameter is specified and matches the logical address of the Resource Manager, then the current error status of

the

VX4521 Module is returned. Error status Information returned by the VX4521 is

formatted as ASCll character strings. If there

IS

no current error

to

report, a null

strlng

IS

returned.

A

logical

address parameter

referencing

any other

VXI

device wrll cause the Resource Manager to try to obtaln the current error status of that device by issuing the Word Serial Protocol Read Protocol Error command. If the referenced device is not a Message Based Device, or is not a servant

of

the VX4521, an

Invalid Logical Address error is generated.

Examples:

If the device does not support the Read Protocol Error command, then a Device Does Not Support WSP Read Protocol command error is generated.

If

the device

has no error to report, a null string is returned.

Error status values returned by the device are displayed in ASCII hex format. If the device buffers its errors, multiple error query commands can be issued until the device's Response Register error bit indicates that there are no more errors

to

report. Multiple error status values are formatted as comma separated ASCll hex

values.

Example

1:

STATUS < CR

>

<

LF

>

This command requests the current status of the VX4521. If there are no errors,

the response is the null strlng

<

CR

>

<

LF> .

Examole

2:

STATUS

#h20 c CR

>

c

LF

>

FFFCH<CR> <LF>

This command requests the current status of the VXlbus device at logical address

20 hex

(32

decimal). The example of a returned response indicates an

Unsupported Command.

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Command: TABLE

Section

3

Svntax:

Purpose:

Description:

TABLE

This command directs the VX4521 to return information on each logical device the VXlbus mainframe.

First, the number of dev~ces

decimal number with a Table Active mode. While in talker on the IEEE-488 bus

of

The

NO

TE:

The ASCll strlng for each device w~ll return a maximum of ten fields, with each

field separated

<

CR

>

<

LF

>

in

the mainframe 1s returned as a

<

CR>

<LF> appended. The VX4521 then goes into the

this

mode, each rime the

it

will return an ASCII strlng of information about one

the

logical devices

VX4521 will leave the Table Active mode if:

the VX4521 has returned an ASCll string for each device in the

1) mainframe which

the VX4521 is addressed as a listener on the IEEE-488 bus and

2)

receives a new command.

The VX4521 wdl remain in the Table Active mode even if some other device in the mainframe is addressed as an active talkerllistener on the

IEEE-488 bus.

<

CR

>

<

LF

>

.

in

the mainframe.

it

controls, or

by

a comma, and the ASCll string terminated with a

The following fields will be sent for each device:

VX4521

two

is addressed

digit ASCII

as

in

a

1

Field

Field 2:

Field

Field 4:

Field 5a:

Field 5b:

:

3:

-

"LA xx"

decimal.

"IEEE rx" decimal.

"SLOT xx" decimal. This field is blank for dev~ces that have not implemented the VXlbus

"MFG

VXlbus ID register. xxx is returned as ASCll hex.

"MODEL was for a TektronixICDS device (manufacturer's ID - FFDh). xxxx is returned as ASCII decimal.

"MODEL 73A-xxx" was for a TektronixKDS devtce (manufacturer's returned as ASCll decimal.

Where xx is the logical address of the device

-

Where xx is the IEEE-488 address of the device in ASCII

-

Where xx is the slot number of the device in ASCII

MODlD bit in the Status register.

xxxh" - Where xxx is the Manufacturer ID of the device's

VXxxxx"

-

This ASCll string is returned for Field 5 if Field

-

This ASCll string is returned for Field

in

ID

-

FFCh). xxx

ASCII

5

if

Field

is

4

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Example:

Field 5c:

Field 6a:

Field 6b:

Field 6c:

Field 7a:

Field 7b:

Field 8:

Field

9:

Field

10:

"MODEL xxxh" - This ASCll string is returned for Field 5 if Field

4

was not a TektronlxiCDS dev~ce. xxx is returned as ASCII hex.

"PASS"

-

This ASCll string is returned for Field 6 if the device's

Passed

bit

in

its VXlbus Status register is set

TRUE

and its Extended

bit is set TRUE

(1

).

"FAIL" - This ASCll strlng 1s returned for Field 6 if the device's

Passed bit in its VXlbus Status reglster

IS

set FALSE.

"EXT"

-

This ASCll string

IS

returned for Field

6

if

the device's Passed bit in its VXlbus Status reglster is set TRUE and its Extended bit is set FALSE

10).

"488.2" - This ASCll string is returned for Field 7 if the device is

a

488.2 instrument.

"[al;[bl;[cl"

-

This ASCII strlng is returned for Field 7 if

the device is

not a 488.2 instrument but does support certam commands in a

-

488.2 manner. L1alid strings for this field are "TRIGGER", "READ STB" and "LOCK". Any combination of these strings may appear in

Field

7

depending on what the device supports. If a device does not

support any 488.2 commands then the field will be an ASCII space.

"[device type]"

-

This field specifies the device type. Valid strings

for this field are: "MESG", "REG", "MEM", "EXT", "FOREIGN", and

"CMDR", corresponding to Message Based Device (non-Commander),

Register Based Device, Memory Device, Extended Device, non-

VXlbus Device, and Message Based Device (Commander).

"lh~erarchyl"

-

Thls fleld contalns the

logical

address of the dev~ce's commanaer. The hlerarchv ~ntormat~on 1s returned as a two digit ASCll hex number.

"loperational model"

-

This field specifies whether a Message Based Device that is a servant of the VX4521 has been issued the Begin Normal Operation command. Valid strings for this field are "NORMAL" and "CONFIGURE". "NORMAL" will be returned if the

device successfully executed the BEGIN NORMAL OPERATION

command.

TABLE<CR> <LF> If the VXlbus mainframe contained two devices, a Tektronix VX4521

Module in

Slot

0

and a CDS 73A-353 Module in slot

1,

the following response would be

returned:

LA

0,

IEEE

01.

SLOT

0,

MFG FFDh, MODEL VX4521, PASS,

,RM<

CR> <LF>

LA

2,

IEEE

02.

SLOT

1,

MFG FFCh, MODEL 73A-353, PASS. TRIGGER; LOCI<,

MESG, 1, NORMAL<CR> <LF>

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Command: TEST

Section

3

Svntax: TEST<CR>

Purpose:

Description:

This command directs the

The test executed at power-up. The results of the self test can be obtained command to the

message is returned.

LED

on the

VX4521

passes its self test, the Failed

Failed LED remains on.

Example:

An error message response might

7:

4521

<LF>

by

this command is the same self rest routine that is executed

VX4521.

If

VX4521

is

Failed Self Test

VX4521

Module to execute its built-in self test

by

sending the

routine.

STATUS

If an error occurred during the self test, an error

no errors occurred, a null string is returned. The Failed

turned on during execution

LED

is turned off. If the self test fails, the

be:

of

the self test routine.

If

the

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Section

Command: TIMEOUT (TimeoutValue)

-

(2)

<

CR>

<

LF

Syntax:

TIMEOUT

>

3

Purpose:

Description:

This command specifies the amount of the Read Ready andlor Write Ready bits in a device's Response register during Word Serial Protocol data transfers.

the timeout value, specified as an ASCII decimal number

z

notation. The timeout value must be in the range

655.35

The tirneout parameter is optional. seconds is assigned.

When

RESET Reset command. not modify the current assignment of the timeout value.

Examples: TIMEOUT

Timeout

<

decimal.

0

1

.O<CR>

900E-3

CR

>

of

trme the VX452 1 waits for the assertion

in

scientific

0

<

=

timeout

If

omitted, the power-up default value of five

is

executed, the timeout value remains what it That is, resetting the VX4521 Resource Manager device does

<

CR

LF

LF>

> <

>

assigns the timeout value to be 1 second

LF>

assrgns the timeout value to be

asslgns the default value of 5 seconds.

was

900

<

prior to

mrll~seconds.

=

the

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Section

3

Command:

WRT

(Write)

Syntax:

WRT

z,

z,;Data

<

CR

>

<

LF

>

Purpose:

This command writes to

VME

memory space.

Descr~pt~on:

The

WRT

command requres three parameters, as \,ell as the data to be wrltten

to the selected

VME

address space

If the selected VMEbus address does not

contain a device that returns DTACI<, a VMEbus Error

IS

gener3ted. The command parameters are separated by a space character. Mult~ple data bytes are separated by a space character.

The

z

parameters and data are separated by a

sem~colon

(;I.

The command is termin3ted with

<

CR

>

<

LF>

The z parameters

are defined as follows:

z,

specifies whether the VME address for successive writes will be incremented, decremented, or remain the same. There are three valid values for this field:

1

(or

I)

-

for lncrementlng the VME address

D

(or dl - for decrementlng the

VME

address

N

(or n) - for a constant address

All

VME

address writes are 16-bit writes, and address incrementing and

decrementing modify the

VME

address reference by

t

2.

Any

z,

values

other than the three specified above w~ll cause an Invalid Command error to

be generated.

-

z,

specifies the VME address modifier to be used for the write cycle. The field may contain any 2-digit ASCll number from

0

to

63

(3F

hex). If an

ASCll hex number is used,

~t

must be preceded by '#HI or '#h'.

z,

specifies the physrcal VME address to

be

used in the write cycle. The field may contaln from one to six ASCll digits. ASCll hex numbers must be preceded by

'#HI

or '#h'. The address value is rounded down to an even

address, if necessary.

z,

is ~mmediately followed by a semicolon

(;I.

Data

contains the actual data to be written to VME address space and must consist of a 16-bit value. This field may contain any ASCll numeric value. ASCII Hex values must be preceded by

'#H1

or '#h'.

The

VX4521

will

translate the ASCll number to a binary number before transmitting the

value over the bus.

<

CR

>

<

LF

>

characters at the end of the data field will terminate the write sequence, and do not get transmitted across the VMEbus.

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Section

3

-

Examples: Example 1:

WRT

n

#h29 #hCOCE; #hBC43 #hBC30 #hBD35 < CR

This command would cause three 16-bit VMEbus writes to occur at

COCE

hex using

VME

address modifier

29

hex

(A1

6

space). The

>

<

LF

>

VME

address

would not change between consecutive writes. The three data values written

BC30

would be BC43 hex,

Example

WRT

2:

i

57

#hFFC408; #h3031 #h3839 #h4l42

hex, and BD35 hex.

<

CR

>

<

LF>

This command would cause three 16-bit VMEbus writes to occur at VME address

FFC408 hex using

address modifier

57

(39 hex, A24 space). The

VME

address would be incremented by 2 between successive writes. The first data

value 13031 hex) would written

NOTE:

to

FFC40A hex;

The VX4521 Module cannot address A32 memory.

be

written to

rhe

last

(4142

FFC408

hex; the next

(3839

hex) would

hex) would be wrltten to FFC40C hex.

be

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Command: WRTB (Write Binaryi

Syntax: WRTB Data

Section

3

Purpose:

Description:

Example:

This command writes to VMEbus memory space.

The WRTB executes VMEbus memory space wrltes ,;cording to the parameters set up previously with the WRTBSETUP command. The data to be written is contained in the Data parameter, and the data values are issued when the WRTB

command is executed.

8

The data values are treated as combined into one 16-bit VMEbus data value. The first byte of each pair is

Dl

placed in bits

WRTBSETUP i #h39 WRTB 3

Assume that the example data values reoresent binary values. (That is, the first

byte in binary format would contain When WRTB is issued, the

200000

The first 16-bit VMEbus data value would contain a

Dl

data value would contain

Note that a < CR

VX4521

command input.

to successfully execute binary writes.

1

323334

hex in

5-D8 and a

uses the IEEE-488 EOI signal to determine the end of the WRTB

5-D8; the second byte is placed in bits

#h200000

A24

space and a second 16-bit value to address

001 10010

>

<

The IEEE-488 Bus Controller must use the

(32

001 1001 1

LF>

is not used to terminate the input command. The

bit unsigned bytes. Each pair of bytes is

D7-DO.

<

CR

>

<

LF

>

VX4521

hex) in bits

001 10001,

wrires one 16-bit data value to address

in

Dl

the second byte

D7-DO.

5-08 and

The second 16-bit VMEbus

001

10001

001 101

00

IEEE-488

001 1001 0,

200002

131

hex) in bits

in bits

D7-DO.

EOI signal

etc.)

hex.

-

Errors:

If an odd number of data bytes is specified in the WRTB command, the lower bits of the last VMEbus data value are undefined.

If WRTB is issued without having previously issued a valid WRTBSETUP

command, an Invalid Command error is generated.

a

If the WRTBSETUP command specifies

device that returns DTACK, then a VMEbus Error is generated.

VMEbus location that does not contain

8

a

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Section

3

Command: WRTBSETUP (Write Binary Setup)

--

Syntax:

WRTBSETUP

z,

<

CR

>

<

LF>

Purpose:

This command sets up parameters for a wrrte to VMEbus memory space.

Descr~ption:

The WRTBSETUP command requires three parameters to set up the VX4521 for fast binary VMEbus data wr~tes. The parameters define the VMEbus address and

modifier, and how that address is manipulated In successive VMEbus wrltes.

The command parameters are defined as follows:

Example:

specifies whether the VME address for successive writes will be incremented, decremented, or remain the same. There are three

valid

values for this field:

I (or i)

-

for lncrementlng the

VME

aadress

D

(or d) - for decrementing the VME adaress

N

(or nl - for a constant address

All VME address writes are 16-bit writes, and address incrementing and decrementing modify the VME address reference by

k

2.

Any

2,

values other than the three specified above will cause an Invalid Command error to be generated.

specifies the

VME

address modifier to be used for the write cycle. The

field may contarn any 2-digit ASCll number from

0

to

63

(3F

hex). If an

ASCll hex number is used, it must be preceded by

'#H'

or '#h'.

specifies the physical VME address to be used in the write cycle. The field may contain from one to

SIX

ASCII digits. ASCll hex numbers must be

preceded

by

'#H'

or

'8%'.

The

address value is rounded down to an even

address, if necessary.

z,

IS

immediately followed by a semicolon

(;I.

The actual VMEbus write does not occur until the WRTB command is executed. Once the write parameters are defined, they remain val~d till a new WRTBSETUP command is issued.

WRTBSETUP

i

#h39

#h200000

<

CR

>

<

LF

>

This example would set up the VX4521 to write to VMEbus address

200000

(hex) in

A24

space. The actual VMEbus access and write would take place when

the WRTB command is issued.

The WRTB command also defines the actual data that is to be written. This minimizes first byte overhead and maximizes VMEbus write throughput.

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Section

Command: WSCMD (Word Serial Protocol Command)

3

Syntax: WSCMD LA, CMD<CR>

Purpose:

Description:

This command is used generate a response by the receivirl

Serial Protocol command specified

by

specified

LA

CMD

The effects of the command are not reflected in the Resource Manager's

Configuration Array. Do not use this command to send Word Serial commands that generate responses by the for that purpose.

N

0

TE:

the Logical Address parameter (LA).

the logical address expressed in either ASCII decimal or ASCll hexadecimal notation. If an

ASCll hex number is used,

the Word Serial Protocol command (as defined by the VXlbus Spec~fication) to be sent to the and data can be expressed in erther ASCll dec~rnal or If an ASCll hex number is used, it must be preceded by

Some Word Serial Protocol commands that did not require a response in Revision 1.2 of the VXlbus Speclfication do require a response in Revision

1.3. This requires special attention when using WSCMD and WSCMD? commands. The Begin Normal Operation command, for example, requires use of the WSCMD command for command for a Revision

to

<LF>

send Word Serial Protocol commands that do not

-

dev~ce. The command sends the Word

cy

the 'CMD' parameter to the VXI device

11

-

255) of the VXlbus device to receive the command,

it

must be preceded by

logical

rece~ving VXI device. Use the WSCMD? command

1.3

device.

device at address LA. The command

a

Revision

'#HI

or

'#h'.

ASCll

1.2

device, and the WSCMD?

'#H'

hex

notation.

or '#h'.

-

Example:

Errors:

WSCMD

This command sends the VXlbus Byte Ava~lable command wlth a data value of

30

If the referenced logical device does not exist, or an Invalid Logical Address error is generated.

If the eight most significant bits of the command value do not correspond valid Word Serial command, an Invalid Command error is generated.

#H31,

hex to the device at the logical address 31 hex.

#HBC30c

CR>

<LF>

is

not a Message Based Device,

to

a

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Section 3

Command:

Syntax:

Purpose:

Description:

WSCMD?

WSCMD? LA, CMD

This command is used to send Word Serial Protocol commands that generate a

response by the receiving device. The command sends the Word Serial Protocol command specified by the 'CMD' parameter to the VXI device specified by the Logical Address parameter (LA).

LA

CMD the Word Serial Protocol command (as defined by the VXlbus

The effects of the command are not reflected in the Resource Manager's

Configurat~on Array. Use this command only to send Word Serial commands that generate responses by the receiving

to the system controller the next time the system controller requests input from

VX4521. The response is formatted in ASCll decimal and termmated with

the

<

CR

do not generate responses.

(Word Serial Protocol Command Query)

<

CR

>

<

LF

>

the logical address expressed in either ASCll decimal or ASCll hexadecimal notation.

ASCll hex number is used, it must be preceded by

to be sent to the logical device at address LA. The command and data can be expressed in either ASCll dec~mal or ASCll hex notation. If an ASCII

hex number is used, it must be preceded by

>

<

LF

>

.

Use the WSCMD command to send Word Serial commands that

(1

-

255)

of the VXlbus device to receive the command,

If

an

'#HI

or

'#h'.

Specification)

'#H'

or '#h'.

VXI

device. The response value is returned

Example:

Errors:

N

0

TE:

Some Word Serial Protocol commands that did not require a response Revision

1.3.

commands. The Begin Normal Operation command, for example, requires

use of the WSCMD command for a Revision command for

WSCMD?

xxxxx<CR>

This command sends the Byte Request command to the VXlbus device at logical address to the Byte Request command. The VX4521

ASCII

If the referenced logical device does not exist,

an Invalid Logical Address error is generated.

If the eight most significant bits of the command value do not correspond to a valid Word Serial command, an Invalid Command error is generated.

20.

decimal value and returns it, followed by a

7

.2

of the VXlbus Specification do require a response in Revision

This requires special attention when us~ng WSCMD and WSCMD?

1.2

device, and the WSCMD?

a

20,

#HDEFF

Revision

<

CR

>

1.3

<

LF

>

device.

<LF>

The device returns a single value (represented by xxxxx) in response

converts that value to a

<

CR

>

<

LF>

.

or

is

not a Message Based

5

digit

in

Device,

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Section

3

Trigger

Commands

The VX4521 has extensive trigger control capabiiities. Under user control, the trigger

control circuitry can:

transparently pass trigger signals from one trigger line to another

route trigger signals to and from the front panel external trigger spigots,

generate trigger events

force the synchronization of an output trigger event to the rising edge of the

VXlbus

CLK10

signal

convert an input trigger event to

a

single output signal of a different pulse width

r

convert a single input trigger event to a delayed output signal or a pulse train of

variable frequency, with each output pulse

100

ns w~de

convert a single input trlgger event Into a continuous square wave of variable frequency.

The input trigger lines are any one of the eight VXlbus

TTL

trigger lines, either of the

two VXlbus

ECL

trigger lines, the front panel External trigger input, the VX4521's

software trigger, or the IEEE-488 GET signal.

The output trigger lines may

be

any combination of the eight TTL trigger lines, the two

I

ECL trigger lines, or the front panel output trigger line.

The following summary gives a general descr~ption of the commands that access the trigger control circuitry on the VX4521

RM.

Detailed descriptions of these commands,

in alphabetical order, are given on the following pages.

ConnTrg

-

Connect Trigger This command allows connecting one input trigger line to one or more output trigger lines. Normally, only one input trigger line can be connected to the

output

trigger lines at any given time. However, the trigger input control hardware can

support a maximum of two different active

input trigger connections if one trigger line is connected to only unsynchronized trigger outputs and the other input trigger line to only

CLK10 synchronized trigger outputs.

To have one input trigger line connected to both

CLI<10

synchronized and

unsynchronized output trigger lines, only one input trigger line can be used.

An

error will be generated

if

this requirement is violated. An error will also be

generated if an attempt is made to connect a trigger line to itself.

DconTrg

-

Disconnect Trigger This command selectively disconnects an input trigger line from one or more output trigger lines, without

affectmg any other output trigger line connections to

that input line.

-

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Section

3

EnblTrg - Enable Trigger

This command enables a previously established trigger line connection.

That

is,

trigger events on an Input trigger line w~ll not be observed on the output trigger

connections until the EnblTrg command is issued.

ALL

connections

must be

enabled before they can function.

DsblTrg

-

Disable Trigger

This command disables a prev~ouslv enabled trigger connectlon. After this command is issued, input trigger events

wrll not be observed on the output trigger lines. This command does not affect the connection itself (i.e. the connection still exists, but is non-funct~onal), EnblTrg and DsblTrg can be

repeatedly issued to an established connectlon.

DelayTrg

-

Delay Trigger This command specifies a delay between the input trigger event and the output trigger signal. The trlgger control circuitry contains a timer that can be programmed to generate delavs from

0

to

6.5

msecs with

100

nsec resolution.

The delayed trigger signal will always be

synchronized

with the CLI<10 signal.

The delayed output pulse

IS

a

100

ns low golng pulse.

PulseTrg

-

Pulse Trigger

This command converts the input trigger event to

a

low going output pulse or

square wave of user-defined frequency, given the

restraints

of the trigger timer

c~rcuitry. The output pulse signal will always be synchronized with CLI(10.

SwTrg

-

Software Trigger This command generates the VX4521's software trigger. The characteristics of the output trigger signal can be modified wrth the DelayTrg and PulseTrg

command. The output trlgger is also controlled by EnblTrg and DsblTrg.

TrgCnfg

-

Trigger Configuration

This command returns the current trlgger connectlon matrlx.

The display

indicates which input trlgger line

(rf

any)

IS

connected to which output trigger line

(if any); whether or not the output

IS

enabled; and what, if any, signal conversion

has been defined (delays, pulse moaification, etc).

In the following command discussions,

Source

refers to the input trigger signal

Dest

refers to the output (destination) trigger slgnal

input

TTL

trigger signals

referenced by the ASCll characters 'TO'

-

'T7'.

input

ECL

triggers

referenced by the ASCll characters 'EO'

&

'El'

XO

front panel external input.

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SO

software trigger

GO

TO

-

T7

CTO

-

EO/EI

XO

/

CXO

The command names and signal references can be In either upper or lower case. In

examples below, the left and right parentheses

parameters from the command

mdicate optional parameters.

NOT

part of the command. The examples In this subsect~on are numbered consecutively

as

an

IEEE-488 GET trigger.

output

CT7 CLI<10 synchronized output

and CEOICE1

output

front panel external output trigger.

aid in cross-referenc~ng.

TTL

trigger signals

ECL

trigger signals.

in

the formal command descript~ons. Square brackets

As

the examples show, the parentheses and brackets are

TTL

trlgger.

'0'

are used only to help differentiate the

the

'[I'

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Command: CONNTRG

Section

3

Syntax:

Purpose: This command connects a single input trigger source to one or more output

Description: Valid Source parameters:

Examples: 1. CONNTRG TO El

CONNTRG (Source Dest [Enbll)

destination trigger signals.

....

TI

TO or

Valid Dest parameters:

TO or CTO and TI and XO or CXO

Valid Enbl parameters:

The [Enbll parameter is not enabled. If specrf~ed, tne and DsblTrg commands.

This example would connect the VXlbus TTL trigger line TO to ECL trigger line providing trigger protocol conversion. Any trigger event occurring on the TO trigger line would be transparently routed to El

or T7 or EO or El or XO or SO or

opt~onal.

<

or CT1

"ENBL" or

connection

CR

>

<

LF

>

GO

....

and

T7

or CT7 and EO or CEO and

""

If ornitred, The trigger connection is established but

IS

established and enabled. (See EnblTrg

El

or

CE1

El,

2. conntrg This example would connect the front panel external trigger input to the VXlbus trigger line. The output trigger signal would be synchronized to the rising edge of

the VXlbus CLI(10 signal. The trigger connections

3.

ConnTrg SO TOCtl Cel

This example would connect the software trtgger signal to the VXlbus

El trigger lines.

CLK10. Because this example connects one input trigger line to both

to synchronized and unsynchronized output trigger lines, this trigger connection cannot

be concurrently active with any other connection.

4. ConnTrg GO TOXO enbl

This example would connect

panel trigger out (for use as a scope trigger, for example). The receive the GET command from the signals in much the same way it would for a software trigger. automatically enabled.

xO ct7

The signals on the

T7

of

examples 1 and 2 can coexist.

TO,

TI and

11 and El trigger lines would be synchronized

the IEEE-488 GET signal to the VXlbus TO and the front

VX4521

488

bus and in turn generate the output trigger

The connection is

RM

would

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Section

3

Command:

DCONTRG

Svntax:

DCONTRG

(Source [Destj)

<

CR

>

<

LF>

Purpose:

This

command disconnects a single input trlgger source from 1 or more destination

trigger signals.

Description: Valid Source parameters:

TO or

TI

....

or

T7

or

EO

or

El

or

XO

or

SO

or

GO

Valid Dest parameters:

TO

or CTO and

T1

or

CT1

....

and

T7

or

CT7

and

EO

or

CEO

and

El

or

CE1

and

XO

or

CXO

The Destinat~on parameter is optional.

If

omitted, all connections to the source

trigger line would be broken.

Disconnecting

a

trigger connection automatically

disables

it.

If the same connection is later re-establ~shed, it must be re-enabled.

(See EnblTrg and DsblTrg commands.1

Examples:

5.

DCONTRG

TO

TI

This

example would disconnect the VXlbus trigger line

TO

from trlgger line

TI.

Any

other trigger lines

TO

was connected to would remain intact.

6.

DconTrg

XO

This example would sever all connections to the front panel external trigger

input.

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Section

3

Command:

--

Syntax:

Purpose: This command enables the output destination trlgger connection.

Description: The Dest parameter is optional.

Examples:

ENBLTRG

<

CR

>

<

LF

ENBLTRG (Dest~

enabled. Enabling only affects connected trigger lines. References to unconnected output trigger lines have no effect.

Valid Dest parameters:

TO

or CTO and T1

and

XO

or

CXO

7. EnblTrg CT1

This example would enable the

clocked T1 line is enabled. connections, the

8.

EnblTrg

This example would enable all currently established output trigger lines. If example

3

was used to establish the trigger connections, the

lines would all be enabled.

TO

and

>

If

omitted,

CT1

....

or

CE1 output trigger lines would still be disabled.

and T7 or CT7 and

CLK10

if

synchron~zed TI output trlgger line.

example 3 was used to establish the trigger

all

current trigger connections are

EO

or

CEO

and

TO,

CT1 and

CE1

output trigger

El

Only

or

CE1

the

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Section

3

Command: DSBLTRG

Svntax:

DSBLTRG (Dest)

<

CR

>

<

LF

>

Purpose:

This command disables tne output destrnation trigger connection.

Description:

The Dest parameter is optional. If omitted, all current output

trlgger connections are

disabled. Disabling only affects connected trigger lines. References to unconnected output trigger lines have no effect.

Valid Dest parameters:

TO or CTO and

T1

or CT1

....

and T7 or CT7 and

EO

or

CEO

and

El

or

CE1

and XO or

CXO

Examples:

9.

DsblTrg

CT1

This example would disable the CLI<10 synchronized

TI

output trigger line. Only the

clocked TI line is disabled. If example

3

was used to establish the trigger

connections and example

8

was used

to

enable them, the execution of this

command would leave

TO

and

CE1

output trigger lines st111 enabled.

10. DsblTrg

This example would disable ail currently established output trigger lines.

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Section 3

Command:

Syntax:

Purpose:

DELAYTRG

DELAYTRG {Source Dest Delay (Cont)

Connects the input source trigger l~ne to the output destination trigger line(s1. The output slgnal will be delayed by the spec~fiea amount after the input trigger event occurs.

Description: Valid Source parameters:

....

TO or T1

or T7 or EO or

Valid Dest parameters:

....

CTO or

CT1

and CT7 and CEO and CE1 and CXO

Valid Delay parameters:

100E-9 to

6.5E-3

Valid Cont parameters:

WCONTT3

or

W"

Valid H parameters:

"H"

or

""

Valid

ENBL

parameters:

"ENBL"

or VW

The Cont (continuous) parameter is optional. If om~tted, each input trigger event generates one delayed output trigger event. If specified, the output pulse is regenerated each Delay tlme period. Subsequent Input trigger events have no affect.

(H)

(ENBL))

El

or XO or SO or GO

<

CR>

<LF>

Examples:

The output signal is a 100 nsec pulse. The polarity of the output pulse is low going. The opt~onal parameter

H

allows spec~fying a high go~ng pulse. The high going pulse

can only be specified for the front panel external output trigger. If the external

H

trigger output line is not referenced in the is

ignored. The maximum delay time is

6.5

destmation trigger lines, the

msecs.

parameter

The delay time is specified as an ASCII decimal number in scientific notation. For

a

example,

600E-6 would equal a 600 psec delay. Delay tlrnes have

100 nsec resolution. In continuous mode, the CLK10 synchronization may degrade the precision of the output frequency.

11. DELAYTRG TO CT1 CXO 5E-3 This example would connect the TO trigger line to the trigger lines. Once enabled, a trigger event occurring on TO will be delayed

H

11

and the external output

5

msecs before appearing on the TO tugger l~ne as a low going 100 nsec pulse and as a high going

100

nsec pulse on the external trigger output spigot on the front panei. Both

output signals are synchronized to CLK10.

12.

DelayTrg

tl

ct7 200E-6

This example would connect the TI trigger line to the T7 trigger line. Once enabled,

a trigger event occurring on Tl will generate a low going 100 nsec pulse on the trigger line after a 200 psec delay.

The output trigger will be synchronized to

T7

CLK10.

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Section

3

13.

DELAYTRG

GO

CT1

1

E-6

Cont

ENBL

This example would connect the IEEE GET signal to the TI trigger line. The output

signal

is

automatically enabled. The first

GET

signal will cause a low going

100

ns

pulse to occur

on

trigger line TI every mrcrosecond. Subsequent

GET

signals are

ignored.

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Command: PULSETRG

Syntax:

Purpose:

Description:

PULSETRG {Source Dest Period (Cont)

(H)

(ENBLI}

<

CR

>

<

LF

>

This command connects the input Source trigger line to the output Destination

The

trigger line.

~nput trigger event will be converted to an output signal pulse of

width Period.

Valid Source parameters: Valid Dest parameters:

TI

TO or

CTO and CT1

or T7 or EO or El or XO or SO or

....

and CT7 and CEO and CE1 and CXO

GO

....

Valid Period parameters: 4E-9 to 13E-3

Valid Cont parameters: "CONT" or Valid H parameters: Valid

ENBL

oarameters:

"H"

or

""

"ENBL" or

The Cont parameter is optional

If

trlgger event

specifiea, the output s~gnal waveform dutv cycle specifled by Perlod the Per~od value and low for half the Perioa value input trigger events have no effect polar~ty

The optional

IS

low golng

H

parameter allows specifying a high going pulse. The high going pulse

""

If omitted a slnqle pulse 1s generated for each lnput

IS

a

contlnuous square wave wlth a

That

is,

the output slgnal 1s high for half

~ii

contlnuous mode, subsequent

When not in continuous mode, the output

pulse

can only be specified for the front panel external output trigger. If the external

H

trigger output line is not referenced in the destination trigger lines, the

H

is ignored. When in the contlnuous mode an

parameter is aiways ignored.

parameter

The Period parameter is spec~fied as an ASCII decimal number in scientific notation.

For example, 1 E-3 would describe a resolution. The CLK10 synchronizat~on may degrade the symmetry of the square wave.

Examples: 14. PULSETRG TO

This example would connect the TO input trigger line to the Once enabled, a trigger event on TO would generate a CLK1 0 synchronized low going 100 psec pulse on

15. pulsetrg SO ctl This example would connect the software trigger to the enabled, the software trigger would generate a contlnuous square wave on the TI trigger line that is high for 100 psec and low for 100 psecs.

16. Pulse €0 CxO This example would route the trigger. The output pulse would be a high going pulse

synchronized to CLI(10.

CT1

2E-8

5E-6

1

E-8

TI.

cont

h

1

mesc pulse. The output pulse has 100 nsec

TI

output trigger line.

TI

trigger line. Once

ECL

trigger line 0 to the front panel external output

5

psecs in duration and

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Section

3

Command:

Syntax:

SWTRG<CR>

<LF>

Purpose:

This command generates

the

VX4521's

software

trigger signal.

Description:

No parameters are associated with th~s command.

Example: SwTrg

Once enabled, the execution of this command would cause output trigger signals

on

whichever lines the software trigger event was connected to. The output trigger signals

can

be conditioned, converted,

or

delayed, by using the other commands.

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Section

3

Command: TRGCNFG

Syntax:

TRGCNFG

<

CR

>

<

LF

>

Purpose:

This command returns trigger control binding and configuration information.

Descrrptron:

This command has no assocrated parameters. The followrng examples demonstrate

the format of the returned

conf~gurat~on ~nformatron. Note that

the

vartous trigger

connectrons shown cannot all exrst

at

the same time.

The numbers

in

parentheses refer to the command examples; they do not appear in

the table returned to the user.

The

use of lower case letters in the Trig Out column

indicates the output trigger signals have not been enabled.

Trig

In

Trig

Out

(1)

TO

E

1

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Section

3

Error Handling

When the VX4521 detects an operational error, ~t Invokes an error message format routine that generates an appropriate

ASCII message. The error message can be read when input

is

requested from the VX4521.

An error message will overwrite any command result data that may already be present in

the buffer, except another error message. Successive error messages are stored

in

the buffer until the buffer becomes full. Once the buffer is full, subsequent error messages are lost. The error message buffer will hold

approx~mately four error messages.

Non-error message information will never overwrite error information.

For example,

suppose you send the HELP command to the VX4521.

This

command generates an

ASCII

message listing the commands accepted by the Resource Manager. Before reading the help information, send the VX4521 a command requesting the status of an non-existent VXI device. The resulting error message w~ll overwrite the help information in the VX4521's message buffer.

The next time you input from the VX4521, you w~ll recelve the error message, not the results of the HELP command. If the opposlte sequence were to occur (first the error, then the HELP command), the HELP command message will not be placed in the VX4521's

message buffer because an error

IS

pending that has not yet been read.

To aid in the detection of asynchronousiy occurring errors, the VX4521 mav be

programmed to generate IEEE-488 Service Requests whenever an error occurs.

See the

discussion on

SRQ

Operation.

The VX4521 error messages and their meanings are as follows:

1:

VMEBus Error

-

A

VMEBus access was attempted, but

no

DTACK occurred.

2:

Invalid Command Rece~ved

-

User Interface Command syntax error.

3:

VME

BERR During IACK - Check Daisy Chain

-

Indicates a break in the VXlbus daisy chained signals.

4: A24 Address Space Conflict

-

The Resource Manager could not calculate a valid A24 memory reference when configuring the VXI memory allocation

for

a VXI device.

5:

A32 Address Space Conflict

-

The Resource Manager could not calculate a valid A32 memory reference when configuring the VXI memory allocation for

a

VXI device.

6:

Invalid Logical Address Received

-

A device does not exist at the referenced logical address, or no device of the correct type exists at that logical address.

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Section

7:

4521 Failed Self Test

The

VX4521

to the user interface command TEST.

8:

Sysfail Asserted And Cannot Be Released

The VXI signal SYSFAIL is being asserted and cannot be cleared by enabling the Sysfail Inhibit capability of each VXI device

9:

Sysfail Asserted By Device At LA

The specified device at decimal log~cal address The device cleared the s~gnal when the Resource Manager set the Sysfail lnhibit bit in the device's Control register.

10:

Disconnect Current Triggers Before Establishing New Ones

This error is generated when a trlgger connection is attempted while valid trigger

connections

connections and then re-issue the trlgger

1 1

:

Invalid IEEE Address Rece~ved

Generated in response to an IEEE-488 bus address that

are already in existence.

-

failed power-up self test, or failed the self test executed in response

3

-

In

the system.

-

LA

To

correct

connection

-

30.

asserted the VXI signal SYSFAIL.

-

it,

disconnect the current trigger

command.

IS

less than 1 or greater than

12:

Cannot Properly Detect All Cards In The Card Cage

Generated during initialization when the Resource Manager detects a different number of cards in the ma~nfrarne than correspond to the driven MODlD lines. This can occur for a number of reasons; for example:

a foreign device is in the cage, presence of a VXI two or more VXI dev~ces are present in the system with the same logical address, or presence of a multi-slot Instrument occumes.

13:

Cannot Grant Servant Device At LA

Generated during inrtializat~on if a commander's servant area encompasses a

non-existent VXI device. existent servant.

14: Device Is Not a Commander

Generated during dynamic commander/servant hierarchy reconfiguration when a device without commander capability is referenced.

15:

Servant Does Not Belong

Generated during dynamic commanderiservant hierarchy reconfiguration when an attempt is made to release a servant device from a commander device that is not currentlv the servant's commander.

dev~ce that does not drive the MODlD lines,

dr~ving the MODlD lines of each slot

-

LA

represents the decimal logical address of the non-

-

To

This Commander

-

it

VXI

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Tektronix VX4521 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual