Synchronous Data Transfer Periods Supported; Req/Ack Offset; Physical Interface; Dc Cable And Connector - Seagate Savvio 10K Product Manual

9.5.1

Synchronous data transfer periods supported

In the following tables, M is the synchronous period value (in the transfer rate negotiation message) that repre-
sents the associated transfer period and transfer rate values.
Table 17 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 17: Synchronous DT DATA transfer periods
Transfer period
M (decimal)
(nanoseconds)
8 6.25
9 12.5
10 25
12 50
25 100
Table 18 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 18: Synchronous ST DATA transfer periods
Transfer period
M (decimal)
(nanoseconds)
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

Savvio SCSI family drives support REQ/ACK offset values from 7 to 63 (3Fh). Offsets of 1 through 6 are nego-
tiated 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 9.8.1 for additional terminator information.
Figure 14 shows the location of the SCSI interface connector.
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

SFF.1 LC model drives receive power through the 80-pin I/O connector. See Tables 20 and 21.
52
Transfer rate
(megatransfers/second)
160.0
80.0
40.0
20.0
10.0
Transfer rate
(megatransfers/second)
1
40.0
20.0
10.0
5.0
Transfer rate
(Mbytes/second) on wide bus
320.0
160.0
80.0
40.0
20.0
Savvio SCSI Product Manual, Rev. D