Glossary
VME-MXI-2 User Manual
Glossary-4
© National Instruments Corporation
BTO unit
Bus Timeout Unit; a functional module that times the duration of
each data transfer and terminates the cycle if the duration is
excessive. Without the termination capability of this module, a
bus master attempt to access a nonexistent slave could result in
an indefinitely long wait for a slave response.
bus master
A device that is capable of requesting the Data Transfer Bus
(DTB) for the purpose of accessing a slave device.
byte
A grouping of adjacent binary digits operated on as a single unit.
Most commonly consists of eight bits.
C
C
Celsius
clearing
Replacing the information in a register, storage location, or
storage unit with zeros or blanks.
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 which 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. In order to support automatic system and
memory configuration, the VXIbus specification requires that all
VXIbus devices have a set of such registers.
configuration space
The upper 16 KB of A16 space in which the configuration
registers for VXIbus devices exist.
controller
An intelligent device (usually involving a CPU) that is capable
of controlling other devices.
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