Seagate Hawk 2 ST11900N, Руководство по эксплуатации продукта

Страница: 57 / 82

Product Manual - Hawk 2 Family SCSI-2 (Volume 1), Rev. B 49
_________________________________________________________________________________________
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.*
Table 11.5-1. Synchronous data transfer periods
M (Decimal) Transfer Period (M times 4 nanoseconds)
25 100
31 125
37 150
50 200
62 250
75 300
87 350
100 400
112 450
125 500
137 550
150 600
162 650
175 700
187 750
200 800
11.5.2 REQ/ACK offset
The maximum REQ/ACK offset supported by the Hawk 2 family is 15 (0Fh).
11.6 Physical interface
Figure 11.6-1 shows 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 “NC” version of this drive has 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 11.6.3-1c.
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.
__________
*SCSI Interface Product Manual, P/N 77738479