KEPCO TMA VXI-27 - Manual (Page 70)

TMA VXI-27 101602
E-1
APPENDIX E - GLOSSARY OF VXI TERMS
E.1 INTRODUCTION
This appendix defines terms used in this manual which apply specifically to the VXIbus and VXI
computer.
BACKPLANE: An assembly, typically a PCB, with 96 pin connectors and signal paths that bus
the connector pins. VXIbus systems will have two sets of bussed connectors, called the J1 and
J2 backplanes, or have three sets of bussed connectors, called the J1, J2 and J3 backplane.
BOARD ASSEMBLY: A board and its associated electrical components and connectors.
COMMAND: Any communication from a commander to a message based servant, consisting of
a write to the servant's Data Low register, possibly preceded by a write to the Data High register.
COMMANDER: A message based device which has bus master capability and may have VXI-
bus servants under it in the system hierarchy. A Commander may act as a Servant to another
Commander.
DEVICE: A component of an VXIbus system. Normally, a device will consist of one VXIbus
board. However, multiple-slot devices and multiple-device module are permitted. Some exam-
ples of devices are computers, power supply controllers, multimeters, multiplexers, signal gen-
eraters and counters.
EVENTS: Signals or interrupts generated by a device to notify another device of an asynchro-
nous event.
LOGICAL ADDRESS: An 8 bit number which uniquely identifies each VXIbus Device in a sys-
tem. It defines a device's A16 register addresses, and indicates Commander/Servant relation-
ships.
MAINFRAME: A rigid framework that provides mechanical support for modules inserted into the
backplane, ensuring that connectors mate properly and that adjacent modules do not contact
each other. It also provides cooling airflow, and ensures that modules do not disengage from the
backplane due to vibration or shock.
MESSAGE BASED DEVICE: An intelligent device which implements the defined VXIbus regis-
ters and communication protocols.
MODULE: Typically consists of a board assembly and its associated mechanical parts, front
panel, optional shields, etc. A module contains everything required to occupy a slot in a main-
frame. A module may occupy one or more slots.
RESOURCE MANAGER: A message based commander located at Logical Address 0 which
provides configuration management services such as address map configuration, commander/
servant mappings, self test and diagnostics management.
RESPONSES: Signals or interrupts generated by a device to notify another device of an asyn-
chronous event. Response's contain the information in the sender's Response register.