User manual

Glossary
VXI-MXI-2 User Manual Glossary-14 © National Instruments Corporation
V
V volts
VDC volts direct current
VME Versa Module Eurocard or IEEE 1014; the IEEE Standard for a
Versatile Backplane Bus.
VME64 ANSI/VITA 1-1994; defines additional VMEbus protocols such
as MBLT and RETRY.
VMEbus System Controller A device configured for installation in Slot 0 of a VXIbus
mainframe or Slot 1 of a VMEbus chassis. This device is unique
in the VMEbus system in that it performs the VMEbus System
Controller functions, including clock sourcing and arbitration for
data transfers across the backplane. Installing such a device into
any other slot can damage the device, the VMEbus/VXIbus
backplane, or both.
VXIbus VMEbus Extensions for Instrumentation
VXIbus System Controller A functional module with circuitry that generates the 16 MHz
system clock, provides the VMEbus arbiter and the VMEbus
Bus Timer Unit, and drives the VXIbus CLK10 signal.
W
write Copying data to a storage device.
Word Serial Protocol The simplest required communication protocol supported by
message-based devices in a VXIbus system. It utilizes the A16
communication registers to transfer data using a simple polling
handshake method.