3 scsi a interface pins, Scsi a interface pins, Scsi a signal description – Avago Technologies LSI53C120 User Manual
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3-4
Specifications
3.1.3 SCSI A Interface Pins
lists the SCSI A side interface pins associated with the 128-pin
Plastic Quad Flat Pack (PQFP).
Table 3.1
SCSI A Signal Description
SCSI A
Pin
Type
Strength
Description
A_SD[15:0]
8, 6, 5,
4, 36,
35, 34,
32, 19,
18, 16,
15, 14,
13, 11,
10
I/O
48 mA
Data (16-bit SCSI bus)
A_SDP/(1-0)
9, 20
I/O
48 mA
Data parity bits
A_SCD/
29
I/O
48 mA
Phase line, command/data
A_SIO/
31
I/O
48 mA
Phase line, input/output
A_SMSG/
26
I/O
48 mA
Phase line, message
A_SREQ/
30
I/O
48 mA
Data handshake signal from target device
A_SACK/
24
I/O
48 mA
Data handshake signal from initiator device
A_SBSY/
23
I/O
48 mA
Bus arbitration signal, busy
A_SATN/
21
I/O
48 mA
Attention, the initiator is requesting a message out
phase
A_SSEL/
27
I/O
48 mA
Bus arbitration signal, select device
A_SRST/
25
I/O
48 mA
Bus Reset