Avago Technologies LSI53C895A - Manual (Page 101)

SCSI Bus Interface Signals 3-13
3.4.3 SCSI Control Signals
Table 3.11 describes the SCSI Control signals.
Table 3.11 SCSI Control Signals
Name PQFP BGA Pos Type Strength Description
SCSI Control includes the following signals:
SCD
−
SCD+
SIO
−
SIO+
SMSG
−
SMSG+
SREQ
−
SREQ+
SREQ2
−
SREQ2+
SACK
−
SACK+
SACK2
−
SACK2+
SBSY
−
SBSY+
SATN
−
SATN+
SRST
−
SRST+
SSEL
−
SSEL+
111
112
97
98
116
117
99
100
101
102
121
122
160
161
123
124
126
127
118
119
113
114
C17
D16
C20
E17
B16
A16
D18
C19
B20
B19
B14
A14
D2
D3
B13
A13
B12
A12
B15
A15
A18
A17
I/O 48 mA
SCSI
SCSI phase line, command/data.
SCSI phase line, input/output.
SCSI phase line, message.
Data handshake line from target device.
Data handshake line from target device. Duplicate
of SREQ
−
and SREQ+ enabled by pulling MAD5
HIGH at reset.
Data handshake signal from the initiator device.
Data handshake signal from the initiator device.
Duplicate of SACK
−
and SACK+ enabled by pulling
MAD5 HIGH at reset.
SCSI bus arbitration signal, busy.
SCSI Attention, the initiator is requesting a
message out phase.
SCSI bus reset.
SCSI bus arbitration signal, select device.
For all SCSI control signals:
LVD Mode: Negative and positive halves of LVDlink signal pairs shown for the SCSI Control.
SE Mode: SCSI Control signals shown. + signals are at 0 Volts.
HVD Mode: SCSI Control signals shown. + signals become direction control.