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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 Mes-
sage 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 REQ/ACK offset supported by the ST15230 family is 15 (0Fh).
11.6
Physical interface
Figures 11.6-1a and 11.6-1b show the locations of the physical interface components for the drive. 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
The "W" and "WD" models of this drive have a 68 pin SCSI I/O connector and a 4 pin DC power connector
together with a 12 pin jumper plug header in one common connector body. See Figures 11.6.3-1a and 11.6.3-
1c for pin outs and signal names.
The "WC" and "DC" models of this drive have an 80 pin I/O connector that has the SCSI interface signals, DC
power and some option select functions all together in the same 80 pin connector. See Figure 11.6.3-1b and
Table 11.6.3-1d for pinouts and signal names.
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.
__________
*SCSI Interface Product Manual, P/N 77738479
Product Manual - Hawk 4 Family (Wide) SCSI-2 (Volume 1), Rev. E
Table 11.5-1. Synchronous data transfer periods
Transfer Period (M times 4 nanoseconds)
100
125
150
200
250
300
350
400
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