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Glossary
Glossary–4
VX4101A MultiPaq Instrument User Manual
External System Controller
The host computer or other external controller that exerts overall control
over VXIbus operations.
FDC
See Fast Data Channel
Fast Data Channel
A communication protocol that uses a block of memory that is accessible to
both client and server. The memory block operates as a message buffer for
either data or command communication.
FAILED Indicator
A red LED indicator that lights when a device on the VXIbus has detected an
internal fault. This might result in the assertion of the SYSFAIL* line.
IACK Daisy Chain Driver
The circuit that drives the VMEbus Interrupt Acknowledge daisy chain line
that runs continuously through all installed modules or through jumpers
across the backplane.
ID-ROM
An NVRAM storage area that provides for non-volatile storage of diagnostic
data.
Instrument Module
A plug-in printed circuit board, with associated components and shields, that
may be installed in a VXIbus mainframe. An instrument module may
contain more than one device. Also, one device may require more than one
instrument module.
Interface Device
A VXIbus device that provides one or more interfaces to external equipment.
Interrupt Handler
A functional module that detects interrupt requests generated by Interrupters
and responds to those requests by requesting status and identity information.
Interrupter
A device capable of asserting VMEbus interrupts and performing the
interrupt acknowledge sequence.
IRQ
The Interrupt ReQuest signal, which is the VMEbus interrupt line that is
asserted by an Interrupter to signify to the controller that a device on the bus
requires service by the controller.
Local Bus
A daisy-chained bus that connects adjacent VXIbus slots.