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Glossary
© National Instruments Corporation G-9 VXI-USB User Manual
VME Versa Module Eurocard or IEEE 1014
VMEbus System
Controller
A device configured for installation in Slot 0 or a VXIbus mainframe or the
first slot in 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
W
Wwatts
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.
write posting A mechanism that signifies that a device will immediately give a successful
acknowledge to a write transfer and place the transfer in a local buffer. The
device can then independently complete the write cycle to the destination.