Synchronous Data Transfer; Synchronous Data Transfer Periods Supported; Req/Ack Offset - Seagate ST34520N - Medalist 4.55 GB Hard Drive Product Manual

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Supported Conditions or feature
N TTD/CIOP
Y Embedded servo
Y 512K data buffer
Y Motor start enable
Y Delayed motor start
Y Write protected
Y Immediate status on Format Unit command
Y Format progress indication
N Sync spindles
N Sync spindles—rotational position offset
N Parameter rounding
N (always strict) Strict bit support
N S2 bit
Y (not implemented) Audio video recovery scheme
Y Segmented caching (1 and 3 supported)
Y Good
Y Check Condition
N Condition Met/Good
Y Busy
N Intermediate/Good
N Intermediate/Condition Met/Good
Y Reservation Conflict
Y Queue Full
9.5

Synchronous data transfer

9.5.1

Synchronous data transfer periods supported

Table 13 and Section 9.5.2 list Synchronous Data transfer periods supported by the drive. The data transfer
period to be used by the drive and the initiator is established by an exchange of messages during the Message
Phase of operation. See the section on message protocol in the SCSI Interface Product Manual , part number
77738479.
Table 13: Synchronous data transfer periods for drive
Transfer period
M (decimal)
(M times 4 nanoseconds)
12 [1]
25 100
50 200
10 [2] 25 [2]
Note.
[1] Fast-20 SCSI transfer period.
[2] Fast-40 SCSI transfer period.
9.5.2

REQ/ACK offset

The maximum value supported by the Medalist Pro family drives for REQ/ACK offset is 15 (0Fh).
50 [1]
Medalist Pro Product Manual, Rev. D