National Instruments 800 Series User Manual
Page 94
Glossary
Glossary-2
© National Instruments Corporation
B
b
bits
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.
bus error
An error that signals failed access to an address. Bus errors occur with
low-level accesses to memory and usually involve hardware with bus
mapping capabilities. For example, nonexistent memory, a nonexistent
register, or an incorrect device access can cause a bus error.
C
CLK10
A 10 MHz, ±100 ppm, individually buffered (to each module slot),
differential ECL system clock that is sourced from Slot 0 of a VXIbus
mainframe and distributed to Slots 1 through 12 on P2. It is distributed
to each slot as a single-source, single-destination signal with a matched
delay of under 8 ns.
CMOS
Complementary Metal Oxide Semiconductor; a process used in making
chips
D
DIN
Deutsches Institut für Normung—German Standards Institute
DMA
Direct Memory Access; a method by which data is transferred between
devices and internal memory without intervention of the central
processing unit