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Table 3-6. Connector SCSI interface interconnect signals
Pin
Number
46
47
48
49
50
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Signal
Signal Name and Description
Mnemonic
MSG*
MESSAGE - signal driven by the target during the
message phase.
SEL*
SELECT - signal used by an initiator to select a target
or by a target to reselect an initiator.
D/C*
DATA/COMMAND - signal driven by the target. It
indicates whether command or data information is on
the data bus. True (low) indicates command.
REQ*
REQUEST - signal driven by a target to indicate a
request for a REQ/ACK data transfer handshake.
O/I*
OUTPUT/INPUT - signal driven by a target which
controls the direction of data movement on the bus.
True (low) indicates input to the initiator. False (high)
indicates output from the initiator. This signal is also
used to distinguish between selection and reselection
phases.
MVME712M Transition Module
3
3-17
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