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Glossary
VX4380 256-Crosspoint Relay Matrix Module User Manual
Glossary–3
D-Size Card
A VXIbus instrument module that is 340.0 × 366.7 mm × 30.48 mm (13.4 ×
14.4 in × 1.2 in).
DTB
See Data Transfer Bus.
DTB Arbiter
A functional module that accepts bus requests from Requester modules and
grants control of the DTB to one Requester at a time.
DUT
Device Under Test.
ECLTRG
Six single-ended ECL trigger lines (two on P2 and four on P3) that function
as inter-module timing resources, and that are bussed across the VXIbus
subsystem backplane. Any module, including the Slot 0 module, may drive
and receive information from these lines. These lines have an impedance of
50 W; the asserted state is logical High.
Embedded Address
An address in a communications protocol in which the destination of the
message is included in the message.
ESTST
Extended STart/STop protocol; used to synchronize VXIbus modules.
Extended Self Test
Any self test or diagnostic power-on routine that executes after the initial
kernel self test program.
External System Controller
The host computer or other external controller that exerts overall control
over VXIbus operations.
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