4 scsi b single-ended interface pins, Scsi b single-ended interface pins, Scsi b signal description – Avago Technologies LSI53C120 User Manual
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Signal Descriptions
3-5
3.1.4 SCSI B Single-ended Interface Pins
lists the SCSI B side single-ended interface pins associated
with the 128 pin Plastic Quad Flat Pack (PQFP).
Table 3.2
SCSI B Signal Description
SCSI B
Pin
Type
Strength
Description
B_SD/(15-0)
95, 97, 98,
99, 67, 68,
69, 71, 84,
85, 87, 88,
89, 90, 92,
93
I/O
48 mA
Data (16-bit SCSI bus)
B_SDP/(1-0)
94, 83
I/O
48 mA
Data parity bits
B_SCD/
74
I/O
48 mA
Phase line, command/data
B_SIO/
72
I/O
48 mA
Phase line, input/output
B_SMSG/
77
I/O
48 mA
Phase line, message
B_SREQ/
73
I/O
48 mA
Data handshake signal from target device
B_SACK/
79
I/O
48 mA
Data handshake signal from initiator device
B_SBSY/
80
I/O
48 mA
Bus arbitration signal, busy
B_SATN/
82
I/O
48 mA
Attention, the initiator is requesting a message out
phase
B_SSEL/
76
I/O
48 mA
Bus arbitration signal, select device
B_SRST/
78
I/O
48 mA
Bus Reset