Hitachi Ultrastar 15K147 SCSI Hard Disk Drive Specification
218
transfer agreement and to set the protocol options between the initiator and the drive.
•
Transfer Period Factor
selects the transfer period and determines the timing values for the trans-
fer rate. When both DT_REQ and IU_REQ are set to one, the following values are used. For the
values larger than 9 is received from the initiator when both DT_REQ and IU_REQ are set to one,
the drive responds with these bits set to zero.
Table 177: Initiator Request/Target Response (DT_REQ = 1, IU_REQ = 1)
If DT_REQ is set one and IU_REQ is set to zero, the following values are used.
Table 178: Initiator Request/Target Response (DT_REQ = 1, IU_REQ = 0)
If both DT_REQ and IU_REQ is set to zero, the following values are used
Table 179: Initiator Request/Target Response (DT_REQ = 0, IU_REQ = 0)
•
REQ/ACK
Offset determines the maximum number of REQs allowed to be outstanding before a
corresponding ACK is received at the drive during synchronous or paced transfers.
-
The REQ/ACK
Offset value is chosen to prevent overflow conditions in the reception buffer and offset
counter of the drive. The drive supports maximum offset of 127 (7Fh). A REQ/ACK Offset value of zero
indicates asynchronous data transfer mode and that the Transfer Period Factor and the protocol options
bits except QAS_REQ will be ignored.
•
Transfer Wide Exponent
defines the transfer width to be used during DATA IN and DATA OUT
phases. If any of the protocol options bits other than QAS_REQ are set to one, then only wide
transfer agreements are valid. The following values are supported.
Initiator Request
Target
Response
Target
Transfer
Transfer Rate
0 <= Mi <= 8
Mt = 08h
6.25 nSec
Fast-160
9 <= Mi <= 9
Mt = 09h
12.5 nSec
Fast-80
Initiator Request
Target
Response
Target
Transfer
Transfer Rate
0 <= Mi <= 9
Mt = 09h
12.5 nSec
Fast-80
10 <= Mi <= 10
Mt = 0Ah
25 nSec
Fast-40
11 <= Mi <= 12
Mt = 0Ch
50 nSec
Fast-20
13 <= Mi <= 25
Mt = 19h
100 nSec
Fast-10
26 <= Mi <= 255
Mt = 19h
(Asynch Mode)
Asynch
Initiator Request
Target
Response
Target
Transfer
Transfer Rate
0 <= Mi <= 10
Mt = 0Ah
25 nSec
Fast-40
11 <= Mi <= 12
Mt = 0Ch
50 nSec
Fast-20
13 <= Mi <= 25
Mt = 19h
100 nSec
Fast-10
26 <= Mi <= 50
Mt = 32h
200 nSec
Fast-5
51 <= Mi <= 255
Mt = 32h
(Asynch Mode)
Asynch
Содержание HUS151414VL3600
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