© National Instruments Corporation
Glossary-1
VXI-AT2000/NI-VXI MS-DOS 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
G-
giga-
10
9
Symbols
°
degrees
%
percent
±
plus or minus
A
A
amperes
A16 space
VXIbus address space equivalent to the VME 64 KB short address space.
In VXI, the upper 16 KB of A16 space is allocated for use by VXI devices
configuration registers. This 16 KB region is referred to as VXI
configuration space.
A24 space
VXIbus address space equivalent to the VME 16 MB standard address
space.
A32 space
VXIbus address space equivalent to the VME 4 GB 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.
