Glossary
VXIpc-486 Model 500 Series
Glossary-4
© National Instruments Corporation
I/O
input/output; the techniques, media, and devices used to achieve
communication between entities.
interrupt
A means for a device to request service from another device.
interrupt handler
A VMEbus functional module that detects interrupt requests
generated by Interrupters and responds to those requests by
requesting status and identify information.
ISA
Industry Standard Architecture
K
KB
kilobytes of memory
L
LED
light-emitting diode
logical address
An 8-bit number that uniquely identifies the location of a VXIbus device's
configuration registers in a system. The A16 base address of a device is
C000h + Logical Address * 40h.
Longword Serial
A form of Word Serial communication in which Commanders and
Servants communicate with 32-bit data transfers instead of 16-bit data
transfers as in the normal Word Serial Protocol.
M
m
meters
MB
megabytes of memory
master
A functional part of a MXI/VME/VXIbus device that initiates data
transfers on the backplane. A transfer can be either a read or a write.
Message-Based
An intelligent device that implements the defined VXIbus registers and
device
communication protocols. These devices are able to use Word Serial
Protocol to communicate with one another through communication
registers.
MIGA
Message-Based Interface Gate Array; a proprietary National Instruments
chip.
MODID
A set of 13 signal lines on the VXI backplane that VXI systems use to
identify which modules are located in which slots in the mainframe.