Synchronous Data Transfer; Synchronous Data Transfer Periods Supported; Req/Ack Offset; Physical Interface - Seagate ST3620N Product Manual

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11.5

Synchronous data transfer

11.5.1

Synchronous data transfer periods supported

Table 11.5-1 and 11.5-2 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 manual*.
M (Decimal)
25
31
37
50
62
75
87
100
112
125
137
150
162
175
187
200
11.5.2

REQ/ACK offset

The maximum value supported by the Hawk 1LP Family drives for REQ/ACK offset is 15 (0Fh).
11.6

Physical interface

Figure 11.6-1 shows the locations of the physical interface components for the ST31200N/ND drives. Shown
are the locations of the D.C. power connector, the SCSI interface connector, and the drive select and option
select header.
An optional version of this drive, the models ST31200NC and ST3620NC, has an 80 pin connector that has
the SCSI I/O signals and the DC power all together in the 80 pin I/O connector. See Figure 11.6.3-1b and Table
11.6.3-1c.
Details of the physical, electrical and logical characteristics are given in paragraphs following, while the SCSI
operational aspects of Seagate drive interfaces are given in the Seagate SCSI Interface Product Manual,
P/N 77738479.
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*SCSI Interface Product Manual, P/N 77738479
Product Manual - Hawk 1LP Family SCSI-2 (Volume 1), Rev. A
Table 11.5-1. Synchronous data transfer periods for drive
Transfer period (M times 4 nanoseconds)
100
125
150
200
250
300
350
400
450
500
550
600
650
700
750
800