S1R72105 Technical Manual
36
EPSON
Rev.1.0
7.3.37 Source/Destination ID (SDID) R/W
Sets both the SCSI-ID of the selector side and the target SCSI-ID when selection is made.
Address
Register Name
Bit Symbol
Description
2Fh SDID
7:
-
6: SID2
SOURCE ID[2] (R/W)
5: SID1
SOURCE ID[1] (R/W)
4: SID0
SOURCE ID[0] (R/W)
3:
-
2: DID2
DESTINATION ID[2] (R)
1: DID1
DESTINATION ID[1] (R)
0: DID0
DESTINATION ID[0] (R)
In Initiator mode, sets the target SCSI-ID to be selected in DESTINATION ID.
When re-selection is received, the target SCSI-ID that makes a re-selection is set in SOURCE ID.
In Target mode, sets the initiator SCSI-ID to be re-selected in DESTINATION ID.
When selection is received, the initiator SCSI-ID that makes a selection is set in SOURCE ID.
7.3.38 Selection Timeout Counter (SLTIME) R/W
Sets time-out delay for selection and re-selection.
Address
Register Name
Bit Symbol
Description
30h SLTIME
7:
ST7
(MSB)
6:
ST6
5:
ST5
4: ST4
Selection Time out Counter
3:
ST3
2:
ST2
1:
ST1
0:
ST0
(MSB)
The time-out delay value is calculated according to the following formula:
Delay value = count value
×
2
15
×
T
×
2
Where T is an internal clock cycle (40MHz).
Detecting time-out causes the following operation of the IC:
Suspends output ID bit.
Negates XSSEL 4000
×
T
×
2 (about 200µs) after such suspension and outputs selection time-out interrupt.
No time-out is detected when this register is set to “0.”
