Seagate ST318418N Product Manual - Page 67
REQ/ACK offset
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Barracuda 36ES2 Product Manual, Rev. B 57 9.5 Synchronous data transfer 9.5.1 Synchronous data transfer periods supported Table 11 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 11: Synchronous data transfer periods M (decimal) Transfer period Transfer rate (nanoseconds) (megatransfers/second) 9 12.5 10 25 12 50 25 100 50 200 80.0 [1] 40.0 [1] 20.0 10.0 5.0 [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 36ES2 family drives for REQ/ACK offset is 63 (3Fh). 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 16 and 17 show the locations of the DC power connector, SCSI interface connector, drive select headers, 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 and LW model drives receive DC power through a 4 pin connector (see Figures 22 and 23 for pin assignments) 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 14 AWG Connector MP 1-480424-0 Contacts (20-14 AWG) AMP 60619-4 (Loose Piece) AMP 61117-4 (Strip)
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