Tektronix VX4244 User Manual
User Manual
VX4244
16-Channel Digitizer Module
070-9067-06
This document supports firmware version X.XX
and above.
Warning
The servicing instructions are for use by qualified
personnel only. To avoid personal injury, do not
perform any servicing unless you are qualified to
do so. Refer to the Safety Summary prior to
performing service.
Copyright T ektronix, Inc. 1994. All rights reserved. Licensed software products are owned by Tektronix or its suppliers
and are protected by United States copyright laws and international treaty provisions.
Use, duplication, or disclosure by the Government is subject to restrictions as set forth in subparagraph (c)(1)(ii) of the
Rights in T echnical Data and Computer Software clause at DFARS 252.227-7013, or subparagraphs (c)(1) and (2) of the
Commercial Computer Software – Restricted Rights clause at F AR 52.227-19, as applicable.
T ektronix 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.
T ektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070–1000
TEKTRONIX and TEK are registered trademarks of T ektronix, Inc.
WARRANTY
T ektronix warrants that this product will be free from defects 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, T ektronix, at its option, either
will repair the defective product without charge for parts and labor, or will provide a replacement in exchange for the
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 T ektronix, with shipping charges prepaid.
T ektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the
T ektronix service center is located. Customer shall be responsible for paying all shipping charges, duties, taxes, and any
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
maintenance and care. T ektronix shall not be obligated to furnish service under this warranty a) to repair damage resulting
from attempts by personnel other than T ektronix 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
IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
TEKTRONIX’ RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND
EXCLUSIVE REMEDY PROVIDED TO THE CUST OMER FOR BREACH OF THIS WARRANTY. TEKTRONIX
AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT , SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS
ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.
Table of Contents
Getting Started
Operating Basics
General Safety Summary iii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Safety Summary vii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preface ix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Getting Started 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product Description 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessories 1–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Controls and Indicators 1–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuration 1–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 1–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation Checklist 1–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Check 1–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Basics 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power-on 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front-Panel Indicators 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Instrument I/O – VXIbus Basics 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Syntax and Commands
Appendices
Glossary and Index
Command Syntax 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Command Groups 3–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Command Descriptions 3–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IEEE 488.2 Common Commands 3–51. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix A: Specifications A–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix B: Input/Output Connections B–1. . . . . . . . . . . . . . . . . . . . . . . .
Appendix C: Self Test Failures C–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix D: Module Diagnostic Commands D–1. . . . . . . . . . . . . . . . . . . .
Appendix E: Examples E–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix F: Performance Verification Tests F–1. . . . . . . . . . . . . . . . . . . .
Appendix H: User Service G–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VX4244 16-Channel Digitizer Module User Manual
i
General Safety Summary
Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it.
Only qualified personnel should perform service procedures.
While using this product, you may need to access other parts of the system. Read
the General Safety Summary in other system manuals for warnings and cautions
related to operating the system.
Injury Precautions
Avoid Electric Overload
Ground the Product
Do Not Operate Without
Covers
Use Proper Fuse
Do Not Operate in
Wet/Damp Conditions
Do Not Operate in an
Explosive Atmosphere
To avoid electric shock or fire hazard, do not apply a voltage to a terminal that is
outside the range specified for that terminal.
This product is indirectly grounded through the grounding conductor of the
mainframe power cord. To avoid electric shock, the grounding conductor must
be connected to earth ground. Before making connections to the input or output
terminals of the product, ensure that the product is properly grounded.
To avoid electric shock or fire hazard, do not operate this product with covers or
panels removed.
To avoid fire hazard, use only the fuse type and rating specified for this product.
To avoid electric shock, do not operate this product in wet or damp conditions.
To avoid injury or fire hazard, do not operate this product in an explosive
atmosphere.
Product Damage Precautions
Provide Proper Ventilation
Do Not Operate With
Suspected Failures
VX4244 16-Channel Digitizer Module User Manual
To prevent product overheating, provide proper ventilation.
If you suspect there is damage to this product, have it inspected by qualified
service personnel.
iii
General Safety Summary
Safety Terms and Symbols
Terms in This Manual
Terms on the Product
These terms may appear in this manual:
WARNING. Warning statements identify conditions or practices that could result
in injury or loss of life.
CAUTION. Caution statements identify conditions or practices that could result in
damage to this product or other property.
These terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you read the
marking.
WARNING indicates an injury hazard not immediately accessible as you read the
marking.
CAUTION indicates a hazard to property including the product.
Symbols on the Product
The following symbols may appear on the product:
DANGER
High Voltage
Protective Ground
(Earth) T erminal
ATTENTION
Refer to Manual
Double
Insulated
iv
VX4244 16-Channel Digitizer Module User Manual
Certifications and Compliances
General Safety Summary
Overvoltage Category
Overvoltage categories are defined as follows:
CAT III: Distribution level mains, fixed installation
CAT II: Local level mains, appliances, portable equipment
CAT I: Signal level, special equipment or parts of equipment, telecommunica-
tion, electronics
VX4244 16-Channel Digitizer Module User Manual
v
Service Safety Summary
Only qualified personnel should perform service procedures. Read this Service
Safety Summary and the General Safety Summary before performing any service
procedures.
Do Not Service Alone
Use Care When Servicing
With Power On
Do not perform internal service or adjustments of this product unless another
person capable of rendering first aid and resuscitation is present.
Dangerous voltages or currents may exist in this product. Disconnect power,
remove battery (if applicable), and disconnect test leads before removing
protective panels, soldering, or replacing components.
To avoid electric shock, do not touch exposed connections.
VX4244 16-Channel Digitizer Module User Manual
vii
Preface
Conventions
This is the user manual for the VX4244 16-Channel Digitizer Module.
Please read and follow all instructions for installation and configuration. Use the
Installation Checklist to insure proper installation, and as a record of initial
settings.
This manual assumes you are familiar with VXIbus instruments and operation,
and with the purpose and function of this instrument. The Operating Basics
section gives a summary of VXIbus operation, and presents an overview of this
instrument’s operation.
The Syntax and Commands section has a summary of all the commands, and
detailed descriptions of each command.
The names of all switches, controls, and indicators appear in this manual exactly
as they appear on the instrument.
Specific conventions for programming are given in the section Syntax and
Commands and in Appendix E: Examples.
VX4244 16-Channel Digitizer Module User Manual
ix
Getting Started
Product Description
This section begins with a brief description of the VX4244, and then explains
how to configure and install the module in a VXIbus mainframe. Then you can
choose to perform the quick functional check, also included in this section, to
gain confidence that the instrument operates properly.
The VX4244 16-Channel Digitizer Module is a printed circuit board assembly
for use in a mainframe conforming to the VXIbus Specification. The VX4244
supplies sixteen channels of 16-bit differential input, analog-to-digital conversion data, sampling at up to 200 kHz. The sixteen analog inputs are organized as
four groups of four channels each. Each group can operate independently, or in
concert with any or all of the other groups. For example, one group could be
actively acquiring data, while the second group is waiting for a trigger, the third
group transferring data, and the fourth group is being post-processed. Programmable features of each channel group include the sampling frequency, arming,
triggering, acquisition control (pre-/center-/post-triggering), and the number of
active channels in the group. In addition, each channel’s input range is independently programmable.
Triggering
Time-tag
Refer to Figure 1–1 for a functional block diagram of the VX4244.
The VX4244 provides extensive triggering control. The trigger inputs for each
channel group include the eight VXI TTL triggers, an external trigger input, an
internal (software) trigger, the VXI command trigger, and a four-quadrant
threshold/ slope trigger. Any or all of these twelve conditions can be logically
ANDed or ORed to generate the group trigger (except for the VXI command and
software triggers, which are mutually exclusive). In addition, each of the four
group triggers is fed to a master trigger logic circuit, which allows the four group
triggers to be logically ANDed or ORed to generate a master trigger output. The
master trigger out can also be programmed to strobe any of the eight VXI TTL
triggers.
A 32-bit time-tag counter is provided for each channel group. The input to the
time-tag can be either the VXI 10 MHz ECL clock (100 ns resolution), or the
master sampling clock. The time-tag clocks are free-running until the channel
group is triggered (at which time the counters are inhibited from counting). The
SYNC signal described below can be used to reset the time-tag counters.
VX4244 16-Channel Digitizer Module User Manual
1–1
Getting Started
1 of 4 Analog
Front End
Channel Group
Memory
Master Clock
32–Bit Counter
/32
Read
GRP 1 32-BIT Register
Time
GRP 2 32-BIT Register
GRP 3 32-BIT Register
Tag
/32
GRP 4 32-BIT Register
Time Tag Circuitry
Cross Switch
Select 1, 2 or
4 Channels
A/D Front
End
Armed/Triggered
LED’S
POWER
FAIL
ACCESS
ERROR
MSB
LSB
Select LED
Display Group
ARMED
TRIG
MIP
MC
Development Board Interface
VXI
10MHz
Not Triggered = Enabled
Trigger 1–4
Clear
Time Tag
Enables
Group
1–4
Status
Development
Board Interface
External
Sync In
TTL Trig
Sync
1
2
3
4
VXI (FDC) Ram Interface
Serial/Parallel
Serial/Parallel
Serial/Parallel
Serial/Parallel
Control
XC3042
Memory
Arbitration
& Control
FDC
DMA
Req
CPU
Sync
Sync Out
Master Clock Out
External Clock In
Sample
Clocks
Data Bus /16
Address Bus
Control
FDC Transfer Request (to 66901)
CPU
68330
/16
CPU Address/Data Bus
4MHz
Clock Sync
Clear
Master Clock
Clear
Clock 1
Clock 2
Clock 3
Clock 4
64K X 16
SRAM
/16/16
/16
CPU Data Bus
VXI
10MHz
Divide by 1 to 65280
Divide by 2
30.6362Hz - 2.0MHz
76.5931Hz - 5.0MHz
Grp 1
Divide by
1/65280
Ext
Grp 2
Divide by
1/65280
Ext
64K X 16
SRAM
CPU RAM Interface
RAM
128K
X 16
FDC Requests
FDC Requests
from Front-End’s
from Front-End’s
Ext
64K X 16
68901 Interrupt
Control
Clock Circuitry
Grp 3
Divide by
1/65280
SRAM
ROM
64K
X 16
Divide by
1/65280
Ext
64K X 16
SRAM
Threshold Comparator
(8 bit)
P P>Q
Flash
ROM
256K
X 16
To CPU
Int 5
Int 4
ASIC Interrupts
Write FIFO Empty
Read FIFO Full
Programmable (ASIC Int 1)
Programmable (ASIC Int 2)
Grp 4
31..16
15..0
Q
SYSD
31..16
SYSD
15..0
Figure 1–1: VX4244 Block Diagram
1–2
VX4244 16-Channel Digitizer Module User Manual
SYSD 31..16
SYSD 15..0
VXI Interface
Sys Data Bus
Word
Long Word
High/Low Word
Getting Started
VME D31-16
VME D15-0
ASIC Interrupts
Write FIFO Empty
Read FIFO Full
Programmable (ASIC Int 1)
Programmable (ASIC Int 2)
I/O Group
Select
Clock 1
Clock 2
Clock 3
Clock 4
Sample
Clock Out
Group Select
1 of 4
Channel
FDC (DMA)
Requests
(0-3)
FDC
Chan
4/5
Trigger Circuitry
Group Select
1 of 4
Trigger Out
Master Trigger Out
64K X 16
SRAM
AND/OR
One
Shot
Address
Decode
Sys Addr Bus
SAD Bus
System Interface
Trigger 1
Trigger 2
Trigger 3
Trigger 4
21 US Nominal
Low Pulse
MUX’d
Address/Data
ASIC
ADG294
Interface
Threshold Detect
(Quadrant Slope)
Group 1
AND/OR
Group 2
AND/OR
Group 3
AND/OR
Group 3
AND/OR
TTL Trig Sync
VXI
XC3042
Trigger
Control
SAD 15-0
VME
A31-16
Enable
Enable
VME
Interrupts
External Trigger In
VXI CMD Trigger
CPU Trigger
VXI TTL Triggers 7..0
Select
1 of 8
Select
1 of 7
VXI TTL
Triggers
VX4244 16-Channel Digitizer Module User Manual
1–3
Getting Started
Synchronization
Sampling
Data Collection
A SYNC function is provided for synchronizing multiple digitizers. This
function can be programmed to use any of seven (1 through 7) VXI TTL trigger
inputs (if enabled), a software command, or an external sync input. The SYNC
input is the logical OR of these conditions. The SYNC signal is global to all
channel groups, and resets all frequency generation counters on the module. In
addition, the SYNC signal is used to reset the time-tag counters. A front panel
SYNC OUT signal is provided which is the logical OR of the three conditions
described above.
The module uses a two-stage clock scheme. The first stage is the master
(reference) clock. Its source can be programmed to be either internal (4 MHz) or
the VXI 10 MHz ECL clock. This clock is divided by two, then fed to a 16-bit
divider to generate the master clock. The master clock is then fed to each of the
four channel groups, which employ an additional 16-bit divider to generate the
actual sampling clock for the group. In addition, each group can be programmed
to use the EXTERNAL CLOCK input signal from the front panel.
Pre-/center-/post-triggering is programmable for each channel group. In addition,
Fast Data Channel (FDC) requests can be generated at programmable sample
counts. This programmability allows data to be transferred from a group at the
same time data is being acquired.
Configuration
Inputs
DSP
The number of channels active within each group is programmable. Any one of
the four channels may be enabled, or any two of the four channels, or all four
channels can be enabled. A total of 256 Kwords of memory is available to each
channel group. If only one channel is enabled, it gets the entire 256 Kwords. For
two channels, each channel gets 128 Kwords, and for four channels, each
channel gets 64 Kwords.
Each channel’s differential input range is independently programmable to ±0.2,
0.5, 1.0, 2.0, 5.0, 10.0, or 20.0 V. Single-ended signals can be acquired by
grounding the negative side of the input.
An isolation relay is supplied for each input, to protect both the module and the
unit-under-test from spurious voltages on power-on. These relays switch between
an on-board reference for self test (default), and the analog inputs.
To facilitate interfacing to digital signal processors, all serial bit streams and
required control signals from all sixteen A/D channels are brought out through
the front-edge connector.
1–4
VX4244 16-Channel Digitizer Module User Manual
Getting Started
BITE (Built-in Test
Accessories
Fuses
Equipment)
The VX4244 Module has +5, –5, +12, –12, +24, –24, and –2 V fuse(s). The
fuses protect the module in case of an accidental shorting of the power bus or
any other situation where excessive current might be drawn.
If the +5 V fuse opens, the VXIbus Resource Manager will be unable to assert
SYSFAIL INHIBIT on this module to disable SYSFAIL*.
If any fuse opens, the fault must be removed before the fuse is replaced. Refer to
a qualified service person for assistance.
Built-in Test Equipment is provided by extensive self tests that are automatically
invoked on power-up, and may also be invoked on command. Circuitry tested
includes the CPU and all memory, the Analog-to-Digital (A/D) converters,
thresholds, latches and counters, the analog front-end, and the signal cross
switching. Arming, triggering, measurement complete, time-tag, and EEPROM
are also tested. The front panel LEDs provide visual BITE for module operation.
Table 1–1 lists the standard accessories included with the VX4244.
T able 1–1: Standard Accessories
Accessory Part Number
VX4244 User Manual 070-9067-XX
VX4244 Reference Manual 070-9377-XX
VX4244 16-Channel Digitizer Module User Manual
1–5
Getting Started
Controls and Indicators
The following controls and indicators are provided to select and display the
functions of the VX4244 Module’s operating environment. See Figures 1–2
and 1–3 for their physical locations.
Switches
LEDs
LEDs
Signal
Inputs
Digital
I/O
The Logical Address switches must be correctly set to insure proper operation.
See Configuration for details of how to set the switches.
The following LEDs are visible at the top of the VX4244 Module’s front panel to
indicate the status of the module’s operation. See Operating Basics for a
description of each LED’s meaning.
POWER FAIL
ARMED ACCESS
TRIG ERROR
MIP GRP2
MC GRP1
S79 MSD
S89 LSD
Logical
Address
Switches
1–6
Figure 1–2: VX4244 Connector, Indicator, and Switch Locations
VX4244 16-Channel Digitizer Module User Manual
LEDs
Signal
Inputs
Digital
I/O
Getting Started
Configuration
Logical Address Switches
Figure 1–3: VX4244 Front Panel
The following switches must be correctly set to insure proper operation. Refer to
Figure 1–2 for their physical locations.
Each function module in a VXIbus System must be assigned a unique logical
address, from 1 to 255 decimal. The base VMEbus address of the VX4244 is set
to a value between 1 and FFh (255d) by two hexadecimal rotary switches. Align
the desired switch position with the arrow on the module shield.
VX4244 16-Channel Digitizer Module User Manual
1–7
Getting Started
The actual physical address of the VX4244 Module is on a 64 byte boundary. If
the switch representing the most significant digit (MSD) of the logical address is
set to position X and the switch representing the least significant digit (LSD) of
the logical address is set to position Y, then the base physical address of the
VX4244 will be [(64d * XYh) + 49152d]. For example:
L.A. MSD LSD Base Physical Address (d)
Ah 0 A (64 * 10) + 49152 = 49792d
15h 1 5 (64 * 21) + 49152 = 50496d
where:
L.A. = Logical Address
MSD = Most Significant Digit
LSD = Least Significant Digit
IEEE-488 Address
Front Panel Connectors
Using the VX4244 Module in an IEEE-488 environment requires knowing the
module’s IEEE-488 address in order to program it. Different manufacturers of
IEEE-488 interface devices may have different algorithms for equating a logical
address with an IEEE-488 address. Consult the operating manual of the
IEEE-488 Interface Module being used.
The front panel has two 50-pin D-type connectors. Refer to Appendix B for
connector pinouts.
1–8
VX4244 16-Channel Digitizer Module User Manual
Installation
Getting Started
This section describes how to install the VX4244.
Tools Required
Requirements and
Cautions
A slotted screwdriver set is required for proper installation.
The VX4244 Module is a C size VXIbus instrument module and therefore may
be installed in any C or D size VXIbus mainframe slot other than slot 0. If the
module is being installed in a D size mainframe, consult the operating manual
for the mainframe to determine how to install the module in that particular
mainframe. Setting the module’s Logical Address switch defines the module’s
programming address. Refer to Configuration for information on selecting and
setting the module’s logical address. To avoid confusion, it is recommended that
the slot number and the logical address be the same.
NOTE. Note that there are two printed ejector handles on the card. To avoid
installing the card incorrectly, make sure the ejector marked “VX4244” is at the
top.
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 instrument modules ordered with a Tektronix mainframe, blank front panels are supplied to cover all unused slots. Additional
VXIbus C size single-slot and C size double-slot blank front panels can be
ordered from your Tektronix supplier.
NOTE. Verify that the mainframe is able to provide adequate cooling and power
with this module installed. Refer to the mainframe Operating Manual for
instructions.
If the VX4244 is used in a Tektronix Mainframe, all VX4244 cooling requirements will be met.
NOTE. If the VX4244 Module is inserted in a slot with any empty slots to the left
of the module, the VME daisy-chain jumpers must be installed on the backplane
in order for the VXI Module to operate properly. Check the manual of the
mainframe being used for jumpering instructions.
VX4244 16-Channel Digitizer Module User Manual
1–9
Getting Started
Installation Procedure
Follow these steps to install the VX4244.
CAUTION. The VX4244 Module is a piece of electronic equipment and therefore
has some susceptibility to electrostatic damage (ESD). ESD precautions must be
taken whenever the module is handled.
1. Record the revision level, serial number (located on the label on the top
shield of the VX4244), and switch settings on the Installation Checklist.
2. The module can now be inserted into one of the instrument slots of the
mainframe.
3. Cable Installation. If the mainframe has a cable tray, route the cable from the
front panel of the module down through the cable tray at the bottom of the
mainframe and out the rear of the mainframe.
1–10
Figure 1–4: Module Installation
VX4244 16-Channel Digitizer Module User Manual
Installation Checklist
Getting Started
Installation parameters will vary depending on the mainframe being used. Be
sure to consult the mainframe Operating Manual before installing and operating
the module.
Revision Level:
Serial No.:
Mainframe Slot Number:
Switch Settings:
VXIbus Logical Address Switch:
(FFh enables dynamic configuration.)
Interrupt Level Select Switch: Dynamically programmed by the Resource
Manager.
Cables Installed: (if any)
Performed by: _______________________ Date: _____________
VX4244 16-Channel Digitizer Module User Manual
1–11
Getting Started
Functional Check
The VX4244 Module will execute a self test at power-on, or on direction of a
VXIbus hard or soft reset condition, or on command. The power-on self test
consists of an interface self test and an instrument self test. The commanded self
test performs only the instrument self test. A VXIbus hard reset occurs when
another device, such as the VXIbus Resource Manager, asserts the backplane line
SYSRST*. A VXIbus soft reset occurs when another device, such as the
VX4244’s commander, sets the Reset bit in the VX4244’s Control register.
At power-on, as well as during self test, all analog inputs remain isolated from
the module’s front panel connector.
During power-on, or a hard or soft reset, the following actions take place:
1. The SYSFAIL* (VME system-failure) line is set active, indicating that the
module is executing a self test, and the Failed LED is on. In the case of a
soft reset, SYSFAIL* is set. However, all Tektronix/CDS commanders will
simultaneously set SYSFAIL INHIBIT. This is done to prevent the resource
manager from prematurely reporting the failure of a card.
2. A subset of the instrument self test, as described in the *TST command, is
then executed. This tests the CPU and all memory, the Analog to Digital
(A/D) converters, thresholds, latches and counters, and the analog front-end.
Arming, triggering, measurement complete, time-tag, and EEPROM are also
tested. If the self test fails, the module makes an internal record of what
failure(s) occurred. The ERROR? command can be used to view the results.
3. On completion of the interface self test, SYSFAIL* is de-asserted. If the test
fails, the SYSFAIL* line remains active. If the interface self test passed, the
SYSFAIL* line is released, and the module enters the VXIbus PASSED state
(ready for normal operation). If it failed, the module enters the VXIbus
FAILED state.
After self test, the module is returned to its default state, as described in the
*RST command description.
Self test can also be run at any time during normal operation by using the *TST
command. This test is more comprehensive than the power-on test, as it is not
subject to the 5 second completion requirement. At the end of a self test initiated
by this command, the module is restored to its power-on state.
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VX4244 16-Channel Digitizer Module User Manual
Getting Started
During a commanded self test:
1. SYSFAIL* is not asserted.
2. The module executes a comprehensive test of the instrument.
3. When the self test is completed, the module sets itself to the power-on
default state, with the exception of queuing any errors detected by the self
test. The ERROR? command can be used to view the results.
SYSFAIL * Operation
SYSFAIL* becomes active during power-on, hard or soft reset, self test, or if the
module loses any of its power voltages. When the mainframe Resource Manager
detects SYSFAIL* set, it will attempt to inhibit the line. This will cause the
VX4244 Module to deactivate SYSFAIL* in all cases except when +5 V power
is lost.
VX4244 16-Channel Digitizer Module User Manual
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Operating Basics
Power-on
The VX4244 16-Channel Digitizer Module is a VXIbus Message Based
instrument, and communicates using the VXIbus Word Serial Protocol. The
module is programmed by ASCII characters issued from the system controller to
the VX4244 via the module’s VXIbus commander and the VXIbus mainframe
backplane. Refer to the manual for the VXIbus device that will be the VX4244
Module’s commander for details on the operation of that device.
The sixteen analog inputs of the VX4244 are organized as four groups of four
channels each. Each group can operate independently, or in concert with any or
all of the other groups. For example, one group could be actively acquiring data,
while the second group is waiting for a trigger, the third group transferring data,
and the fourth group is being post-processed. Programmable features of each
channel group include the sampling frequency, arming, triggering, acquisition
control (pre-/center-/post-triggering), and the number of active channels in the
group. In addition, each channel’s input range is independently programmable.
The VX4244 will complete its self test and be ready for programming five
seconds after power-on. The VXIbus Resource Manager may add an additional
one or two second delay. The Power LED will be on, and all other LEDs off. The
MSG LED will blink during the power-on sequence as the VXIbus Resource
Manager addresses all modules in the mainframe. The default condition of the
module after power-on is is listed in the *RST command description. Self test
failures are described in Appendix C.
The format and syntax for the command strings is described in Syntax and
Commands. An alphabetical listing of the complete description of each command
is in the Command Descriptions.
Front-Panel Indicators
The VX4244 current operating status may be determined from the LEDs on the
front panel.
Power LED
Failed LED
VX4244 16-Channel Digitizer Module User Manual
This green LED is normally lighted and is extinguished if the ±5, –2, ±12, or
±24 V supplies fail or module fuses blow.
This normally off red LED is lighted whenever SYSFAIL* is asserted, indicating
a module failure. Module failures include failure to correctly complete an
2–1
Operating Basics
interface self test, loss of a power rail, or failure of the module’s central
processor.
If the module loses any of its power voltages, the Failed LED will go on and
SYSFAIL* will be asserted. A module power failure is indicated when the
module’s Power LED is extinguished.
Access LED
Armed LED
TRIG (Triggered) LED
MIP (Measurement In
Progress) LED
MC (Measurement
Complete) LED
Error LED
This yellow LED is normally off. When lighted, it indicates that the module is
processing a VMEbus cycle. The LED is controlled by circuitry that appears to
stretch the length of the VMEbus cycle. For example, a 5 s cycle will light the
LED for approximately 0.2 seconds. The LED will remain lighted if the module
is being constantly accessed.
When lighted, this green LED indicates the channel group is “armed” and is
awaiting or processing the trigger. This LED goes out when data sampling is
complete.
When lighted, this green LED indicates the channel group has triggered.
When lighted, this green LED indicates that sampling for the channel group is
taking place. The LED is turned off whenever the memory is full, the memory is
accessed via the CPU, or the module is halted or reset.
This green LED indicates the conversion process for the channel group is
complete.
This yellow LED indicates an error has been detected by the module. It is cleared
when all errors have been read from the module, or the module is reset.
2–2
GRP2, GRP1 LEDs
These LEDs reflect the current channel group being displayed (see the DISPlay
command). They are encoded as shown below.
GRP2 GRP1 Group
Off Off 1
Off On 2
On Off 3
On On 4
VX4244 16-Channel Digitizer Module User Manual
Instrument I/O – VXIbus Basics
CAUTION. If the user’s mainframe has other manufacturer’s computer boards
operating in the role of VXIbus foreign devices, the assertion of BERR* (as
defined by the VXIbus Specification) may cause operating problems on these
boards.
The VX4244 Module is a C size single slot VXIbus Message-Based Word Serial
instrument. It uses the A16, D16 VME interface available on the backplane P1
connector and does not require any A24 or A32 address space. The module is a
D16 interrupter.
The VX4244 Module is neither a VXIbus commander or VMEbus master, and
therefore it does not have a VXIbus Signal register. The VX4244 is a VXIbus
message based servant.
The module supports the Normal Transfer Mode of the VXIbus, using the Write
Ready, Read Ready, Data In Ready (DIR), and Data Out Ready (DOR) bits of
the module’s Response register.
Operating Basics
A Normal Transfer Mode read of the VX4244 Module proceeds as follows:
1. The commander reads the VX4244’s Response register and checks if the
Write Ready and DOR bits are true. If they are, the commander proceeds to
the next step. If not, the commander continues to poll these bits until they
become true.
2. The commander writes the Byte Request command (0DEFFh) to the
VX4244’s Data Low register.
3. The commander reads the VX4244’s Response register and checks if the
Read Ready and DOR bits are true. If they are, the commander proceeds to
the next step. If not, the commander continues to poll these bits until they
become true.
4. The commander reads the VX4244’s Data Low register.
A Normal Transfer Mode Write to the VX4244 Module proceeds as follows:
1. The commander reads the VX4244’s Response register and checks if the
Write Ready and DIR bits are true. If they are, the commander proceeds to
the next step. If not, the commander continues to poll the Write Ready and
DIR bits until they are true.
2. The commander writes the Byte Available command which contains the data
(0BCXX or 0BDXX, depending on the End bit) to the VX4244’s Data Low
register.
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Operating Basics
The VX4244 Module also supports the Fast Handshake Mode during readback.
In this mode, the module is capable of transferring data at optimal backplane
speed without the need of the commander’s testing any of the handshake bits.
The VX4244 Module asserts BERR* to switch from Fast Handshake Mode to
Normal Transfer Mode, per VXI Specification. The VX4244’s Read Ready,
Write Ready, DIR and DOR bits react properly, in case the commander does not
support the Fast Handshake Mode.
A Fast Handshake Transfer Mode Read of the VX4244 Module proceeds as
follows:
1. The commander writes the Byte Request command (0DEFFh) to the
VX4244’s Data Low register.
2. The commander reads the VX4244’s Data Low register.
The VX4244 Module has no registers beyond those defined for VXIbus message
based devices. All communications with the module are through the Data Low
register, the Response register or the VXIbus interrupt cycle. Any attempt by
another module to read or write to any undefined location of the VX4244’s
address space may cause incorrect operation of the module.
VX4244 Configuration
Registers
As with all VXIbus devices, the VX4244 Module has registers located within a
64 byte block in the A16 address space.
The base address of the VX4244 device’s registers is determined by the device’s
unique logical address and can be calculated as follows:
Base Address = V * 40H + C000H
where V is the device’s logical address as set by the Logical Address switches.
Table 2–1 is a list of the VX4244 Configuration registers with a complete
description of each. In this list, RO = Read Only, WO = Write Only, R = Read,
and W = Write. The address is relative to the module’s base address.
T able 2–1: Register Definitions
Register Address T ype Value (Bits 15–0)
ID Register 0000H RO 1011 1111 1111 1 100 (BFFCh)
Device Type 0002H RO See Device Type definition below
Status 0004H R Defined by state of interface
Control 0004H W Defined by state of interface
2–4
Offset 0006H WO Not used
Protocol 0008H RO 1111 0111 1111 1111 (F7FFh)
Response 000AH RO Defined by state of the interface
VX4244 16-Channel Digitizer Module User Manual
Operating Basics
T able 2–1: Register Definitions (Cont.)
Register Value (Bits 15–0)TypeAddress
Data High 000CH Not used
Data Low 000EH W See Data Low definition below
Data Low 000EH R See Data Low definition below
Register Bit Definitions. The Read Protocol command response is F62Bh.
VX4244 16-Channel Digitizer Module User Manual
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Command Syntax
Command protocol and syntax for the VX4244 Module are as follows:
H A command string consists of a string of ASCII-encoded characters (up to
H Commands can be sent either individually, or strung together by delimiting
255 maximum) terminated by a <program message terminator>. The
<program message terminator> is optional white space, followed by any one
of the following command terminations:
A line feed <LF> character (0a hex, 10 decimal)
The END bit set
The END bit with a line feed
The command string is buffered until the terminator is encountered, at which
time the entire string is processed.
the individual commands with a semi-colon (;). For example, the string
sets channel 2 to a voltage range of ±10 volts, and group 1’s trigger source to
the external trigger input.
NOTE. Up to twenty command strings can be queued for processing by the
module. If this limit is exceeded, the additional command strings will be lost,
until space is freed up on the input queue. The Wait to Continue (*WAI) and
Operation Complete Query (*OPC?) commands will block processing and cause
the queue to fill up.
H All characters in a command may be sent in either upper or lower case form.
H Multiple data parameters passed by a command, or returned in a response are
separated by a comma (,).
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Command Syntax
H White space characters can be used to make a command string more
readable, and are ASCII-encoded bytes in the range 00–09, 0B–20 hex
(0–9,11–32 decimal). This range includes the ASCII control characters and
the space, but excludes the line feed <LF>. White space characters are
ignored when legally encountered in a command string. White space is
allowed anywhere in a command string, EXCEPT for the following:
Within a program mnemonic (for example, VO LT)
Around a colon (:) mnemonic separator (for example, VOLT: RANGE or
VOLT :RANGE)
Between a mnemonic and a (?) (for example, VOLT:RANGE ?)
Following an asterisk (*) (for example, * STB?)
Within a number (for example, 12 34)
Within a channel/group list (for example, ( @1) or (@1, 2) )
The following is a legal command string illustrating the use of white space:
VOLT:RANGE 1.00E+1 (@1,2,5:9); ERR?; fetch:data? 10 , 11
Without white spaces, this string is:
VOLT:RANGE1.00E+1(@1,2,5,9);ERR?;fetch:data?10,11
H A question mark (?) following a command indicates a response is to be
returned. All responses from the module are terminated with the line feed
<LF> (0a hex) character.
NOTE. If a read operation is performed without first issuing a command
requiring a response (?), a BUS TIMEOUT will occur.
H In the command descriptions, the following special characters are used.
Except for the colon (:), these characters are not part of the command, and
should not be sent. If an optional field is omitted, the command’s default will
be applied.
[ ] Brackets indicate an optional field
| A bar indicates a logical OR choice
: A colon is used to separate command fields
3–2
< > Field indicator
VX4244 16-Channel Digitizer Module User Manual
Command Syntax
Field Definitions
<channel list>. The channel list field is used to apply commands to multiple
channels. Channels can be listed individually, separated by a comma; sequentially, separated by a colon; or a combination of the two. For example,
(@1,3,5,9:11,16) specifies channels 1, 3, 5, 9, 10, 11, and 16. Valid channel
numbers are 1 through 16. If a query response is expected from the command,
the response is returned in the same order as the channel list. For example
specifying (@1,16,2) returns the value of channel 1, followed by the value of
channel 16, followed by the value of channel 2. In addition (ALL) can be
specified as a channel list, equivalent to (@1:16).
<group list>. The group list field is used for those commands which apply to a
channel group. There are four channel groups of four channels each:
Group Channels
1 1 – 4
2 5 – 8
3 9 – 12
4 13 – 16
The same syntax as the <channel list> applies to the <group list>. For example,
(@1,2,3:4) specifies groups 1, 2, 3, and 4. In addition (ALL) can be specified as
a group list, equivalent to (@1:4).
Specifiers
<channel id> or <group id>. Some commands can only be specified on a single
channel or group. The syntax is the same as above, but only one channel or
group can be specified, for example, (@1).
<boolean>. ASCII 0 or 1
<hex16 value>. 16 bit hex value, ASCII 0000 through FFFF, right justified.
<x..y>. Any single value between x and y, inclusive of x and y.
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