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Glossary
© National Instruments Corporation G-3 VXI-8340 Series User Manual
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. Examples of buses include the ISA bus, PCI bus,
VXI bus, and VME bus.
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.
bus master A device that is capable of requesting the Data Transfer Bus (DTB) for the
purpose of accessing a slave device.
byte order How bytes are arranged within a word or how words are arranged within
a longword. Motorola ordering stores the most significant byte (MSB) 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.
C
C Celsius
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.
Commander A message-based device that is also a bus master and can control one or
more Servants.
configuration registers A set of registers through which the system can identify a module
device type, model, manufacturer, address space, and memory
requirements. To support automatic system and memory configuration,
the VXI specification requires that all VXIbus devices have a set of such
registers.