Glossary
©
National Instruments Corporation
G-3
MXI-2 Configuration Reference Manual
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 capable of requesting the Data Transfer Bus (DTB) for the
purpose of accessing a slave device.
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.
CompactPCI
An adaptation of the PCI specification for industrial and/or embedded
applications that require a more robust mechanical form factor than desktop
PCI. CompactPCI provides a standard form factor for those applications
requiring the high performance of PCI as well as the small size and
ruggedness of a rack-mount system.
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 VXIbus
specification requires that all VXIbus devices have a set of such registers.