Glossary
VME-MXI-2 User Manual
Glossary-10
© National Instruments Corporation
P
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. RETRY support is also located on P2. 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
VME-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 VMEbus 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.
R
read
To get information from any input device or file storage media.
register-based device
A Servant-only device that supports VXIbus configuration
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.
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