Synchronous Data Transfer; Synchronous Data Transfer Periods Supported; Req/Ack Offset; Physical Interface - Seagate ST336737LW Product Manual

Barracuda 36ES Product Manual, Rev. H
9.5

Synchronous data transfer

9.5.1

Synchronous data transfer periods supported

Table 12 and Section 9.5.2 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 Product Manual, part number
75789509.
Table 12: Synchronous data transfer periods
Transfer period
M (decimal)
(nanoseconds)
9 12.5
10 25
12 50
25 100
50 200
1. This transfer rate is only allowed when using the LVD interface.
9.5.2

REQ/ACK offset

The maximum value supported by the Barracuda 36ES family drives for REQ/ACK offset is 31 (1Fh).
9.6

Physical interface

This section describes the connectors, cables, signals, terminators and bus timing of the DC and SCSI I/O
interface. See Section 9.8 and Section 9.9 for additional terminator information.
Figures 22 and 23 show the locations of the DC power connector, SCSI interface connector, drive select head-
ers, 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 SCSI Interface Product Manual , part number
75789509.
9.6.1

DC cable and connector

N, W, and LW model drives receive DC power through a 4 pin connector (see Figures 22 and 23 for pin assign-
ments) mounted at the rear of the main PCBA. Recommended part numbers of the mating connector are listed
below, but equivalent parts may be used.
Type of cable Connector
14 AWG MP 1-480424-0
LC model drives receive power through the 80-pin I/O connector. See Tables 17 and 18.
Transfer rate
(megatransfers/second)
1
80.0
1
40.0
20.0
10.0
5.0
Contacts (20-14 AWG)
AMP 60619-4 (Loose Piece)
AMP 61117-4 (Strip)
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