Synchronous Data Transfer; Synchronous Data Transfer Periods Supported; Req/Ack Offset; Physical Interface - Seagate ST32430N - Hawk 2.1 GB Hard Drive 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
11.5.2

REQ/ACK offset

The maximum value supported by the Hawk 2LP 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 N/ND drives. Shown are the
locations of the D.C. power connector, the SCSI interface connector, the I/O line terminators, and the drive
select and option select header.
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 2LP Family SCSI-2 (Volume 1), Rev. A
Table 11.5-1. Synchronous data transfer periods for drive
Transfer period (M times 4 nanoseconds)
100
124
150
200
250
300
350
400