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ST15150N/ND/W/WD/WC/DC Product Manual, Rev. D
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 12 lists synchronous data transfer periods supported by the drive. The
data transfer periods used by the drive and initiator is established by an
exchange of messages during the Message phase of operation. Refer to the
message protocol section in the SCSI-2 Interface Product Manual .
Table 12. 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
ST15150N/ND/W/WD drives receive DC power through a 4-pin connector
mounted at the rear of the main PCB (see Figure 28, 29, or 30). Recom-
mended part numbers of the mating connector are listed below, but equiva-
lent parts may be used.
ST15150WC/DC drives receive DC power through the SCA connector (see
Tables 18 and 19).
Table 13. 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.
Pins
1 +12V DC
2 +12V DC return
3 +5V DC return
4 +5V DC
100
125
150
200
250
300
350
400
Contacts (20-14 AWG)
AMP 60619-4 (loose piece)
AMP 61117-4 (strip)
4
Transfer rate
10.0
8.0
6.66
5.0
4.0
3.33
2.86
2.5
3
2
1
67
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