4-40
Registers
Register: 0x0A
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
Encoded Destination SCSI ID
[3:0]
Reading the
register
immediately after the LSI53C896 SCSI function 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
bit.
Register: 0x0B
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
0
0
0
0
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
*
Содержание LSI53C896
Страница 6: ...vi Preface...
Страница 16: ...xvi Contents...
Страница 88: ...2 62 Functional Description...
Страница 112: ...3 24 Signal Descriptions...
Страница 306: ...6 38 Specifications This page intentionally left blank...
Страница 310: ...6 42 Specifications This page intentionally left blank...
Страница 338: ...6 70 Specifications Figure 6 40 LSI53C896 329 BGA Bottom View...
Страница 340: ...6 72 Specifications...
Страница 346: ...A 6 Register Summary...
Страница 362: ...IX 12 Index...