Page 1
Ethernet
transceiver
IMS B300
TCPlink Development System
Ethernet
cable
AUI cable
Diagnostic
terminal
Differential subsystem cables
(e.g. IMS CA15)
Single-ended
subsystem
cables
IMS B300
TCPLink
box
OS-Links
Prototyping
system
ST20450
Development
Board
Subsystem 3
FEATURES DESCRIPTION
Compact desktop design, suitable for office or
computer room environments
Provides full interface to four independent networks over Ethernet
Uses TCP/IP protocol suite
The IMS B300 TCPlink box is a self-contained unit
providing four links and associated system services for connection to target subsystems. The
four links are accessed over an Ethernet network
by host development computers running SGS–
THOMSON Toolsets in conjunction with the TCP/
IP protocol suite. The unit supports the develop-
Choice of single ended or differential link con-
ment of programs in a network environment.
nections
Diagnostic and monitoring facilities are provided
Independent diagnostics and test port simplifies installation of software enhancements
LED activity indicators for each connection
via a serial port on the IMS B300. This may be connected to an ANSI compatible video terminal to
give interactive information displays on the unit’s
operation.
INMOS is a registered trademark of SGS-THOMSON Microelectronics Limited
February 1996
42 1493 03
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1 Overview
The IMS B300 is a complete fully cased sub-system unit that supports the development of applications in a networked
environment. Up to four target systems can be connected to the IMS B300. These can be connected up via differential
cables to a target with a differential interface, such as the ST20450 Development Board or via a single ended cable such
as the IMS CA16
connections avoids the need to install interface hardware within each type of workstation.
The IMS B300 contains a high performance multi-processor implementation of the TCP/IP protocol stack, giving a network interface that is easily integrated into open-systems environments. A link service is offered over TCP connections
giving transparent access to four subsystem and link interfaces from a host based environment.
Multiple IMS B300 systems can be installed for larger development groups, with shared access facilities controlled using
a system of named link ‘capabilities’.
The status and configuration of each IMS B300 system can be examined and monitored using an attached serial terminal
which gives access to an interactive display capability . Front panel LEDs also give a continuous display of system activity.
. The facilities can be shared amongst a larger group of development engineers and the use of network
2 Interfaces
2.1 Connection to Ethernet
The network connection provides an IEEE-802.3 AUI connection. This allows connections to either 10BASE-5,
10BASE-2 and 10BASE-T physical media via suitable ‘tap boxes’.
A standard IEEE 802.3 AUI cable should be used to connect the IMS B300 to an Ethernet transceiver. The cable should
be secured to the back panel connector using the slide lock provided. Suitable cables are available from transceiver vendors.
2.2 Connection to diagnostic terminal
The serial port on the rear panel may be connected to an ANSI compatible video terminal to give interactive information
displays on the operation of the IMS B300. If this connection is not used, the IMS B300 will still operate as normal. Standard RS232 levels are used on the serial port (male 9-way D-type) which has a pin-out equivalent to that of an IBM PC
A T serial socket. The serial cable supplied with the IMS B300 works with VT220 and VT320 ASCII terminals and compatibles or PCs running ASCII terminal emulation. The software on the IMS B300 programs the serial port to run at 9600
baud, 8 data bits, 1 stop bit, with XON/XOFF flow control. It is not necessary to use the hardware flow control lines (RTS
and DTS) provided on the connector. An example cable description for the terminal cable is given in Figure 1.
IMS B300 T erminal
pin 2
pin 3
pin 5
9–way
female
D–type
Figure 1 Example cable connection to diagnostic terminal
2.3 Diagnostic functions
pin 2
pin 3
pin 7
25–way
female
D–type
Diagnosis and monitoring of a ‘live’ unit is achieved via a serial port on the IMS B300. This expects to communicate with
an ANSI compliant video terminal. A set of LEDs on the box front panel gives diagnostic information about the state of
each interface.
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IMS B300 Ethernet connection system datasheet
One of the link connections has an associated services ‘Up’ port which can be connected to an IMS B008 or similar board
in a PC. This allows field-service diagnosis of a dead unit which cannot boot-up from its own ROMs.
2.4 LED displays
The IMS B300 has seven front panel LED indicators. The right-most LED is the power indicator and should be illuminated
when powered up. The other six LED’s are under software control. Full details of their functions are given in
[1].
3 Connecting the IMS B300 to a target network
The IMS B300 can have up to four separate networks connected to it which can be accessed individually through the
Ethernet. These networks can be interfaced to the IMS B300 in one of the following ways:
Single Ended
Differentially
The different methods can be intermixed with each other if required.
Each network interface consists of a set of three subsystem control signals and a pair of link connections.
If the noise on the connection rises above TTL signal noise margins, due to long cables or noisy environments, the signals
passing down the cable can be corrupted. Differential communications can be used to overcome both noise and earth
loop problems. They have a higher noise margin making them far less susceptible to noise. No common ground is required for differential signals so earth loop problems are also reduced.
A single-ended electrical connection usually provides the simplest and most convenient option. This is because TRAMs
and motherboards also use single-ended connections. However, in electrically noisy environments it is possible that
single-ended connections can suffer from data errors. Although in practice such errors are usually not observed, it is not
possible to ensure perfect error-free operation without using differential connections.
3.1 Connecting the IMS B300 to a differential target such as the ST20450 Development Board
For reliable operation in noisy environments, a differential cable should be used. Target systems such as the ST20450
Development Board [2] use a differential buffer to drive the OS-Link in addition to subsystem signals. A differential buf fer
circuit such as the one used for the ST20450 Development Board is shown in Appendix A.
Physical connections are made using the 92CAB053 differential cable supplied with the ST20450 Development Board,
(order number ST20450-SAB/XXX). This cable is marked ‘Host’ and ‘Target’ at each end and should be connected
accordingly , i.e. ‘Host’ connected to the IMS B300 and ‘Target’ to the front panel differential connector on the ST20450
Development Board, as shown in figure 3. Jumper J3 on the development board should be configured in the ‘Front’ position as shown in figure 2.
Jumper J3
Back
Front
Figure 2 ST20450 Development Board J3 position
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Page 4
IMS B300
back panel
ST20450 Development
Boards
P2
Differential cables
Figure 3 Connection of four IMS B300 differential cables to ST20450 Development Boards
3.2 Using single ended connections via the IMS CA16 cables
A single-ended connection cable of type IMS CA16 can be used to connect the 26 way differential link connector to a
standard single ended OS-Link connector. The compact ‘D’ type connector mates with one of the subsystem connectors
at the rear of the IMS B300. The other end terminates in three miniature M50 edge connector plugs polarised to match
standard link and subsystem cable conventions.
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IMS B300 Ethernet connection system datasheet
3.2.1 Connections to an IMS B014
The use of the IMS CA16 cable in conjunction with the connectors on a IMS B014 standard VME motherboard is illustrated
in figure 4. The jumper configuration of the motherboard is shown in figure 4. As can be seen, the single ended cable
connections from the IMS B300 are mated with a ‘breakout’ connector or ‘hedgehog’ mounted in the P4 front panel connector of the IMS B014. A TRAM should be inserted in slot 0 of the IMS B014 motherboard array. Other TRAMs may
be added to the motherboard as required. The IMS B014 can be inserted in a VME rack or used in a bench-top mode
via a separate power supply.
Note that this example assumes the use of a 20Mbit/s link speed on both the IMS B300 subsystem and the IMS B014
motherboard. Also note that it is not possible to configure an IMS B014 to access the appropriate signal connections via
its back panel (P2) connector.
FrontServicesUp (on P4)
Link 0
Link 1
Link 2
Link 3
Link 4
Link 5
Link 6
Link 7
FrontConfigUp (on P4)
Connector Link (on P4)
not used
FrontConfigDown (P5)
From IMS B300
via IMS CA16 cable
SubsystemDown
Link
not used
FrontServicesDown (on P5)
Figure 4 Front panel ‘breakout’ connector on P4 of IMS B014
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4 Protocols
The TCP/IP Internet Protocol Suite, normally referred to as TCP/IP after the main standards, was developed for the DARPA/NSF Internet. The TCP/IP protocols have proved so popular that they are used for many networks not connected
to the Internet.
The protocols, standards and policies of TCP/IP are published by the Network Information Center (NIC) and are known
as Requests For Comments (RFCs). The TCP/IP protocols used by the TCPlink box are designed to conform to RFC
1122 ‘‘Host Requirements – Communications’’.
The IMS B300 incorporates firmware, implementing the following protocol elements:
Linkops Connection Server
Provides access to named subsystems over TCP/IP to remote users.
TCP and UDP transport services
The TCP implementation provides a reliable connection oriented transport layer, designed to meet Internet stan-
dards RFC793 and RFC 1122. UDP provides a datagram service, implemented to RFC768 and RFC 1 122.
IP Network Layer
This layer is designed to meet Internet standards RFC791 and RFC1122 for IP layer behaviour.
Address Resolution Protocol
The dynamic Ethernet address resolution protocol, designed to meet Internet standards RFC826 and RFC1 122.
Ethernet Data Link Layer
The Ethernet interface in the device encapsulates IP layer datagrams within Ethernet packets. The packetisa-
tion used is as specified in Internet standard RFC894 (i.e. Ethernet V2 Packetisation). The Data Link Layer re-
quirements of RFC1122 are also met by this layer.
5 Performance
A raw TCP data-rate of several hundred kilobytes/second is supported. Some reduction in total data bandwidth may occur
due to the host server or when multiple IMS B300 links are operating concurrently.
6 Specification
Feature Value Unit
Power dissipation 25 W
Operating temperature 10-40
Weight 7 kg
Length 421 mm
Height 95 mm
Depth 251 mm
Links and system services signals are buffered to levels compatible with EIA RS-422. Inputs will also receive TTL compatible signals and one side of the outputs can be used to drive TTL compatible loads. The serial interface provides a functional subset of an EIA RS232 DCE. The IMS B300 is powered from AC mains and is compatible with worldwide mains
supplies. The unit is shock and vibration resistant to a level consistent with office and air-freight standards.
6.1 Mains connection
The IMS B300 may be connected to either a 110V or 240V mains supply and will automatically switch to the supplied
level. A clean mains supply is required in one of the two voltage ranges shown in T able 1. The IMS B300 must be earthed
via the mains cable supplied. A mains fuse should be fitted to the power inlet module, rated as shown in Table 1. The
°C
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IMS B300 Ethernet connection system datasheet
fuse holder is located behind a small cover immediately above the back panel mains socket. The mains cable must be
unplugged before lifting this cover.
251mm
Mains supply voltage range
Fuse rating
90 - 132V AC 2A
175 - 264V AC 2A
Table 1 IMS B300 mains supplies and fuse ratings
421mm
Top view
95mm
Front panel
0123 SR
iq systems IMS B300
Rear panel view
LINK 0
SERIAL ETHERNET
LINK 1 LINK 2 LINK 3
Figure 5 IMS B300 dimensions and connector positions
I
0
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Page 8
7 IMS B300 back panel connectors
7.1 Subsystem link connector (Link 0–3)
+ve
GND
–ve
Figure 6 Subsystem link connector (viewed from rear panel)
Pin
Signal Pin Signal
1 +notSSDownReset 14 GND
2 +notSSDownAnalyse 15 GND
3 +notSSDownError 16 GND
4 +notSSUpReset 17 GND
5 +notSSUpAnalyse 18 GND
6 +notSSUpError 19 –notSSDownReset
7 +LinkOut 20 –notSSDownAnalyse
8 +LinkIn 21 –notSSDownError
9 GND 22 –notSSUpReset
10 GND 23 –notSSUpAnalyse
11 GND 24 –notSSUpError
12 GND 25 –LinkOut
13 GND 26 –LinkIn
123456789
101112131415161718
1920212223242526
Table 2 Subsystem link connector pinout
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IMS B300 Ethernet connection system datasheet
7.1.1 Ethernet connector
12345678
9 101112131415
Figure 7 Ethernet connector (viewed from rear panel)
Pin
Signal Pin Signal
1 Logic Ref 9 Collision-
2 Collision+ 10 Transmit-
3 Transmit+ 11 Logic Ref
4 Logic Ref 12 Receive-
5 Receive+ 13 Power
6 Power return 14 Logic Ref
7 N/C 15 N/C
8 Logic Ref
7.1.2 Serial connector
Table 3 Ethernet connector pinout
12345
6789
Figure 8 Serial connector (viewed from rear panel)
Pin
Signal Pin Signal
1 N/C 6 N/C
2 Rx data 7 RTS
3 Tx data 8 N/C
4 DTR 9 N/C
5 Ground
Table 4 Serial connector pinout
8 Cables
An IMS CA16 single ended link cable is supplied with the IMS B300. However, the use of a differential link cable (IMS
CA15) is recommended for use in electrically noisy environments.
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Page 10
9 Associated development software
The IMS B300 should be used in conjunction with current SGS–THOMSON development toolsets.
10 Support
Development toolkit products are fully supported by worldwide SGS-THOMSON sales offices and authorised distributors.
11 Ordering information
Description Order number
IMS B300 network connection device IMS B300-1
12 References
1
IMS B300 TCPlink User Manual,
SGS–THOMSON Microelectronics Ltd 1996, 72 TRN 299 03
ST20450 Development Board Datasheet
2
, SGS–THOMSON Microelectronics Ltd 1996, 42 1671 02
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IMS B300 Ethernet connection system datasheet
Appendix A Differential Buffer circuit
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Page 12
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGSTHOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express
written approval of SGS-THOMSON Microelectronics.
1996 SGS-THOMSON Microelectronics - All Rights Reserved
, , IMS, occam and DS-Link are trademarks of SGS-THOMSON Microelectronics Limited.
is a registered trademark of the SGS-THOMSON Microelectronics Group.
SGS-THOMSON Microelectronics GROUP OF COMPANIES
Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco -
The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
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