Specifications
Hawk 2XL Product Manual, Rev. B 49
9.5 Synchronous data transfer
9.5.1 Synchronous data transfer periods supported
Table 10 lists 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 opera-
tion. See the section on message protocol in the SCSI Interface Manual P/N 77738479.
Table 10: Synchronous data transfer periods for drive
9.5.2 REQ/ACK offset
The maximum value supported by the Hawk 2XL family drives for REQ/ACK offset is 15 (0Fh).
9.6 Physical interface
Figures 9a, 9b and 9c show the locations of the drive physical interface components. Shown are the locations
of the DC power connector, the SCSI interface connector, and the drive select and option select headers.
Details of the physical, electrical and logical characteristics are given in sections following, while the SCSI
operational aspects of Seagate drive interfaces are given in the Seagate SCSI Interface Product Manual, P/N
77738479.
This section describes the connectors, cables, signals, terminators and bus timing of the DC and SCSI I/O
Interface. See Sections 9.7 and 9.8 for additional terminator information.
9.6.1 DC cable and connector
With the exception of “WC” model drives, the drive receives DC power through a 4 pin connector (see Figure
9a for pin assignment) mounted at the rear of the main PCB. Recommended part numbers of the mating DC
power connector are listed below, but equivalent parts may be used.
Model “WC” receives power through the 80 pin I/O connector. See Table 11c.
[1] ULTRA SCSI transfer periods. Applies only to models ST32155/ST31055.
M (Decimal) Transfer period (M times 4 nanoseconds)
12 [1] 50 [1]
15 [1] 62.5 [1]
18 [1] 75 [1]
25 100
31 125
37 150
50 200
62 250
75 300
87 350
100 400
Type of Cable Connector Contacts (20-14 AWG)
14 AWG MP 1-480424-0 AMP 60619-4 (Loose Piece)
AMP 61117-4 (Strip)
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