Glossary
Getting Started with Your VXIpc 800/700
G-2
©
National Instruments Corporation
a byte location in a given space. Valid numbers for n are 16, 24, and 32.
In VME/VXI, because there are six address modifiers, there are 64
possible address spaces.
address window
A portion of address space that can be accessed from the application
program
ANSI
American National Standards Institute
ASIC
application-specific integrated circuit
B
B
bytes
backplane
An assembly, typically a printed circuit board, with 96-pin connectors
and signal paths that bus the connector pins. A C-size VXIbus system
will have two sets of bused connectors called J1 and J2. A D-size
VXIbus system will have three sets of bused connectors called J1, J2,
and J3.
BERR*
Bus error signal
BIOS
Basic Input/Output System. BIOS functions are the fundamental level
of any PC or compatible computer. BIOS functions embody the basic
operations needed for successful use of the computer’s hardware
resources.
BTO
See Bus Timeout Unit.
Bus Timeout Unit
A functional module that times the duration of each data transfer
and terminates the cycle if the duration is excessive. Without the
termination capability of this module, a bus master attempt to access a
nonexistent slave could result in an indefinitely long wait for a slave
response.
byte order
How bytes are arranged within a word or how words are arranged within
a longword. Motorola ordering stores the most significant (MSB) byte
or word first, followed by the least significant byte (LSB) or word. Intel
ordering stores the LSB or word first, followed by the MSB or word.
