Seagate ST15150N Product Manual - Page 77

Synchronous data transfer, DC cable and connector

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ST15150N/ND/W/WD/WC/DC Product Manual, Rev. D 67 11.5 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. 11.5.1 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 Transfer rate (decimal) (M times 4 nanoseconds) (mega transfers/second) 25 100 31 125 37 150 50 200 62 250 75 300 87 350 100 400 10.0 8.0 6.66 5.0 4.0 3.33 2.86 2.5 11.5.2 REQ/ACK offset The maximum REQ/ACK offset supported by Barracuda drives is 15 (0Fh). 11.6 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). Recommended part numbers of the mating connector are listed below, but equivalent 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 Contacts (20-14 AWG) 14 AWG AMP 1-480424-0 AMP 60619-4 (loose piece) AMP 61117-4 (strip) 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 4 32 1 3 +5V DC return 4 +5V DC

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ST15150N/ND/W/WD/WC/DC Product Manual, Rev. D
67
11.5
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.
11.5.1
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
Transfer rate
(decimal)
(M times 4 nanoseconds)
(mega transfers/second)
25
100
10.0
31
125
8.0
37
150
6.66
50
200
5.0
62
250
4.0
75
300
3.33
87
350
2.86
100
400
2.5
11.5.2
REQ/ACK offset
The maximum REQ/ACK offset supported by Barracuda drives is 15 (0Fh).
11.6
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
Contacts (20-14 AWG)
14 AWG
AMP 1-480424-0
AMP 60619-4 (loose piece)
AMP 61117-4 (strip)
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
1
2
3
4