Register: 0x0b (0x8b) – Avago Technologies LSI53C825AE User Manual
Page 127
Operating Registers
4-39
Register: 0x0A (0x09)
SCSI Selector ID (SSID)
Read Only
VAL
SCSI Valid
7
If VAL is asserted, then the two SCSI IDs are detected
on the bus during a bus-initiated selection or reselection,
and the encoded destination SCSI ID bits below are valid.
If VAL is deasserted, only one ID is present and the
contents of the encoded destination ID are meaningless.
R
Reserved
[6:4]
ENID[3:0]
Encoded Destination SCSI ID
[3:0]
Reading the
register
immediately after the LSI53C825A is selected or
reselected returns the binary-encoded SCSI ID of the
device that performed the operation. These bits are
invalid for targets that are selected under the single
initiator option of the SCSI-1 specification. This condition
is detected by examining the VAL bit above.
Register: 0x0B (0x8B)
SCSI Bus Control Lines (SBCL)
Read Only
REQ
Assert SCSI REQ/ Signal
7
ACK
Assert SCSI ACK/ Signal
6
BSY
Assert SCSI BSY/ Signal
5
SEL
Assert SCSI SEL/ Signal
4
ATN
Assert SCSI ATN/ Signal
3
7
6
4
3
0
VAL
R
ENID[3:0]
0
x
x
x
0
0
0
0
7
6
5
4
3
2
1
0
REQ
ACK
BSY
SEL
ATN
MSG
C/D
I/O
x
x
x
x
x
x
x
x