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52
11.5
11.5.1
11.5.2
11.6
Synchronous data transfer
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-2 Interface Product Manual.
Synchronous data transfer periods supported
Table 8 lists the synchronous data transfer periods supported by the drive.
Table 8. Synchronous data transfer periods
M
Transfer period
(decimal)
(M times 4 nanoseconds) (mega transfers/second)
25
31
37
50
62
75
87
100
REQ/ACK offset
The maximum REQ/ACK offset supported by Barracuda drives is 15 (0Fh).
DC cable and connector
The drive receives DC power through a 4-pin connector mounted at the rear
of the main PCB (see Figure 17). Recommended part numbers of the mating
connector are listed below, but equivalent parts may be used.
Table 9. Mating connector parts
Type of cable Connector
14 AWG
AMP 1-480424-0
Note. The output of a power supply must meet SELV (safety extra low
voltage), as defined in IEC 950.
3
4
2
ST12450W/WD Product Manual, Rev. A
100
125
150
200
250
300
350
400
Contacts (20-14 AWG)
AMP 60619-4 (loose piece)
AMP 61117-4 (strip)
Pins
1
+12V DC
1
2
+12V DC return
3
+5V DC return
4
+5V DC
Transfer rate
10.0
8.0
6.66
5.0
4.00
3.33
2.86
2.5
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