National Instruments VXI-AO-48XDC, Руководство пользователя, Страница: 44 / 58

Glossary
VXI-AO-48XDC User Manual G-2 © National Instruments Corporation
A/D analog-to-digital
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.
address window A portion of address space that can be accessed from the application
program.
ANSI American National Standards Institute.
API application programming interface
B
backplane An assembly, typically a printed circuit board, with 96-pin connectors and
signal paths that bus the connector pins. VXIbus systems will have two sets
of bused connectors, called the J1 and J2 backplanes, or have three sets of
bused connectors, called the J1, J2, and J3 backplane.
base address A memory address that serves as the starting address for programmable
registers. All other addresses are located by adding to the base address.
BCD binary-coded decimal
bit One binary digit, either 0 or 1.
bus The group of conductors that interconnect individual circuitry in a
computer. Typically, a bus is the expansion vehicle to which I/O or other
devices are connected.
byte Eight related bits of data, an eight-bit binary number. Also used to denote
the amount of memory required to store one byte of data.