Seagate ST373454 Manual download pdf (Page 65)

Cheetah 15K.3 SCSI Product Manual, Rev. G 55

9.5 Synchronous data transfer

9.5.1 Synchronous data transfer periods supported

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. In the following tables, M is the synchronous period value (in the transfer rate

negotiation message) that represents the associated transfer period and transfer rate values.

Table 12 lists the synchronous data transfer periods supported by the drive in DT DATA phase. DT DATA phase

is only allowed when using the LVD interface.

Table 12: Synchronous DT DATA transfer periods

Table 13 lists the synchronous data transfer periods supported by the drive in ST DATA phase. ST DATA phase

is allowed with either LVD or SE interface except as noted.

Table 13: Synchronous ST DATA transfer periods

9.5.2 REQ/ACK offset

Cheetah 15K.3 SCSI family drives support REQ/ACK offset values from 7 to 63 (3Fh). Offsets of 1 through 6

are negotiated to 0 (asynchronous transfer).

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

9.6.1 DC cable and connector

ST373453LW and ST336753LW drives receive DC power through a 4-pin connector (see Figure 24 for pin

assignment) mounted at the rear of the main PCBA. Recommended part numbers of the mating connector are

listed below, but equivalent parts may be used.

LC model drives receive power through the 80-pin I/O connector. See Tables 17 and 18.

M (decimal)

Transfer period

(nanoseconds)

Transfer rate

(megatransfers/second)

Transfer rate

(MBytes/second) on wide bus

8 6.25 160.0 320.0

9 12.5 80.0 160.0

10 25 40.0 80.0

12 50 20.0 40.0

25 100 10.0 20.0

M (decimal)

Transfer period

(nanoseconds)

Transfer rate

(megatransfers/second)

10 25 40.0

1. This transfer rate is only allowed when using the LVD interface.

12 50 20.0

25 100 10.0

50 200 5.0

Type of cable Connector Contacts (20-14 AWG)

14 AWG MP 1-480424-0 AMP 60619-4 (Loose Piece)

AMP 61117-4 (Strip)

1 2 ... 60 61 62 63 64 65 66 67 68 69 70 ... 93 94

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Seagate ST373454 Manual Page 65

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