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SCSI Interconnections
Table F-1. SCSI Connector J10 Interconnect Signals (Continued)
Pin
Number
57
58
59
60
F
61
62
63
64
65-68
F-2
Signal
Mnemonic
BSY*
Busy. SCSI busy signal; indicates that the bus is in use.
ACK*
Acknowledge. Driven by an initiator; indicates an
acknowledgment for a REQ/ACK data transfer handshake.
RST*
Reset. SCSI reset signal; clears the bus of all activity.
MSG*
Message. Driven by the target during the message transfer
phase.
SEL*
Select. Used by the initiator to select a target or by a target
to reselect an initiator.
D/C*
Data/Command. Driven by the target; indicates whether
control or data information is on the data bus. True (low)
indicates control information.
REQ*
Request. Driven by the target; indicates a request for a
REQ/ACK data transfer handshake.
O/I*
Output/Input. Driven by a target; controls the direction of
data movement on the SCSI 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.
DB08*-DB11* Data Bus (bits 08-11). SCSI interconnect lines.
Signal Name and Description
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