Glossary
© National Instruments Corporation
Glossary-7
VME-MXI-2 User Manual
interlocked arbitration mode
Contrasted with normal operating mode; an optional mode of
operation in which the system performs as one large VMEbus
mainframe with only one master of the entire system (VMEbus
and MXIbus) at any given moment. In this mode there is no
chance for a deadlock situation.
interrupt
A means for a device to request service from another device.
interrupt handler
A VMEbus functional module that detects interrupt requests
generated by interrupters and responds to those requests by
requesting status and identify information.
interrupter
A device capable of asserting interrupts and responding to an
interrupt acknowledge cycle.
interrupt level
The relative priority at which a device can interrupt.
INTX
Interrupt and Timing Extension; a daughter card option that
plugs into the two daughter card connectors on the first-
generation VME-MXI. It extends the seven VMEbus interrupt
lines and the VMEbus utility signals SYSRESET*, SYSFAIL*,
and ACFAIL*. This functionality is built into the VME-MXI-2,
so this daughter card is not required.
inward cycle
A data transfer cycle that maps from the MXIbus to the
VMEbus.
IRQ*
Interrupt signal
K
KB
Kilobytes of memory
L
LED
Light Emitting Diode
logical address
An 8-bit number that uniquely identifies each VXIbus device in
a system. It defines the A16 register base address of a device,
and indicates Commander and Servant relationships.
LSB
Least Significant Bit (bit 0)
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