LSI 53C875A User Manual
SCSI Bus Interface Signals
3-9
3.4.2 SCSI Signals
describes the SCSI signals.
3.4.3 SCSI Control Signals
describes the SCSI Control signals.
Table 3.9
SCSI Signals
Name
PQFP
BGA
Type
Strength
Description
SD[15:0]
113, 115–17, 85–87, 89,
102, 103, 105–108, 110,
111
102, 103, 105–108, 110,
111
D13, E10, C13, D11, J9,
L13, K11, J10, G10, G9,
F13, F11–9, E12, E11
L13, K11, J10, G10, G9,
F13, F11–9, E12, E11
I/O
48 mA SCSI SCSI Data.
SDP[1:0] 112, 101
F8, G13
I/O
48 mA SCSI SCSI Parity.
Table 3.10
SCSI Control Signals
Name
PQFP
BGA
Type Strength Description
SCD
92
J12
I/O
48 mA
SCSI phase line, command/data
SIO
90
K13
I/O
48 mA
SCSI phase line, input/output.
SMSG
95
H11
I/O
48 mA
SCSI phase line, message.
SREQ
91
J11
I/O
48 mA
Data handshake line from target device.
SACK
97
H13
I/O
48 mA
Data handshake signal from the initiator device.
SBSY
98
H9
I/O
48 mA
SCSI bus arbitration signal, busy.
SATN
100
G12
I/O
48 mA
SCSI Attention, the initiator is requesting a message out
phase.
phase.
SRST
96
H12
I/O
48 mA
SCSI bus reset.
SSEL
94
H10
I/O
48 mA
SCSI bus arbitration signal, select device.