User manual

Glossary

VXI-MXI-2 User Manual Glossary-10 © National Instruments Corporation

P1 The minimum connector required for a VMEbus system. It

includes 24 address lines, 16 data lines, and all control,

arbitration, and interrupt signals.

P2 A second VMEbus connector providing 32 bits of address and

data. In VXI, the P2 connector adds trigger, MODID, and

CLK10 signals.

P3 A third connector defined by the VXIbus specification that adds

a 100 MHz CLK and additional triggering capabilities. The

VXI-MXI-2 does not have support for P3.

parity Ensures that there is always either an even number or an odd

number of asserted bits in a byte, character, or word, according

to the logic of the system. If a bit should be lost in data

transmission, its loss can be detected by checking the parity.

PASSED state The state a VXIbus device enters after its self-tests are complete

and the device is ready for normal operation.

PRI Priority

privileged access See supervisory access.

propagation The transmission of signal through a computer system.

read To get information from any input device or file storage media.

registers. Register-based devices are typically controlled by

message-based devices via device-dependent register reads and

writes.

retry An acknowledge by a destination that signifies that the cycle did

not complete and should be repeated.