S1R72104 Technical Manual
16
EPSON
Rev.1.1
7.3.10 SCSI Own ID (OWNID) R/W
Sets the SCSI-ID of this IC itself.
7 6 5 4 3 2 1 0
- -
-
-
-
OID2 OID2 OID0
0Eh
7.3.11 Source/Destination ID (SDID) R/W
Sets both the SCSI-ID of the selector side and the target SCSI-ID when selection is made.
7 6 5 4 3 2 1 0
- SID2 SID1 SID0 -
DID2
DID1 DID0
0Fh
DESTINATION
ID
(R)
SOURCE
ID
(R/W)
In Initiator mode, sets the target SCSI-ID to be selected in DESTINATION ID.
When re-selection is received, the target SCSI-ID which made 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 which made selection is set in SOURCE ID.
7.3.12 Selection Timeout Counter (SLTIME) R/W
Sets time-out delay for selection and re-selection.
7 6 5 4 3 2 1 0
ST7
ST6 ST5 ST4 ST3
ST2 ST1 ST0
10h
The time-out delay value is calculated according to the following formula:
Delay value = count value
×
2
15
×
T
×
2
Where, T is internal clock cycle (40MHz).
The IC acts as follows if it detected time-out:
Suspends to output ID bit.
Negates XSSEL 4000
×
T
×
2 (about 200µs) after such suspension, and outputs selection time-out interrupt.
No time-out is detected if “0” is set to this register.
7.3.13 FIFO Control (FIFOCTL) R/W
Used for clearing the data of SCSI-FIFO and for checking its status.
7 6 5 4 3 2 1 0
- -
-
- - FCLR
FULL
EMPTY
11h
FIFO EMPTY
FIFO
FULL
CLEAR FIFO
BIT7,6,5,4,3 RESERVED
BIT2 CLEAR FIFO
HIGH of this bit clears the data stored in SCSI-FIFO.
The bit returns to LOW automatically after such clearing.
BIT1 FULL
HIGH of this bit means that SCSI-FIFO is full. In such a condition, any data written in SCSI-FIFO is ignored.
BIT0 EMPTY
HIGH of this bit means that SCSI-FIFO is empty. In such a condition, any trial to read data from SCSI-FIFO results
in invalid data read out.