© National Instruments Corporation
Glossary-1
VXI-AT2023/NI-VXI ISC 386/ix Getting Started
Glossary
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Prefix
Meaning
Value
n-
nano-
10
-9
µ
-
micro-
10
-6
m-
milli-
10
-3
k-
kilo-
10
3
M-
mega-
10
6
Symbols
°
degrees
%
percent
±
plus or minus
A
A
amperes
A16 space
VXIbus address space equivalent to the VME 64 kilobyte short address
space. In VXI, the upper 16 kilobytes of A16 space is allocated for use by
VXI devices configuration registers. This 16 kilobyte region is referred to
as VXI configuration space.
A24 space
VXIbus address space equivalent to the VME 16 megabyte standard
address space.
A32 space
VXIbus address space equivalent to the VME 4 gigabyte extended address
space.
address
Character code that identifies a specific location (or series of locations) in
memory.
address modifier
One of six signals in the VMEbus specification used by VMEbus masters
to indicate the address space in which a data transfer is to take place.
address space
A set of 2
n
memory locations differentiated from other such sets in
VXI/VMEbus systems by six addressing lines known as address
modifiers. n is the number of address lines required to uniquely specify 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.
