Barracuda 18LP Family: ST39175LW/LC ST318275LW ... - Seagate

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52 Barracuda 18LP Product Manual, Rev. E 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 “Extended Message” on message protocol in the SCSI Interface Product Manual, part number 77738479. Byte 3 of the message format lists a transfer period factor. The factors possible and equivalent transfer periods are listed in Table 11. Table 11: Synchronous data transfer periods for drive Transfer period factor Transfer period (nanoseconds) 00h-09h Reserved [1] 0Ah Transfer period equals 25 ns [2] 0Bh Transfer period equals 30.3 ns [3] 0Ch Transfer period equals 50 ns [3] 0Dh-18h Transfer period equals the transfer period factor * 4 [3] 19h-31h Transfer period equals the transfer period factor * 4 [4] 32h-FFh Transfer period equals the transfer period factor * 4 [5] Notes. [1] Faster timings may be allowed by future SCSI parallel interface standards. [2] Fast-40 data transfer rates that have a period equal to 25 ns or 30.3 ns. [3] Fast-20 data transfer rates that have a period of ≤ 96 ns and ≥ 50 ns. [4] Fast-10 data transfer rates that have a period of ≤ 196 ns and ≥ 100 ns. [5] Fast-5 data transfer rates that have a period of ≤ 1020 ns and ≥ 200 ns. 9.5.2 REQ/ACK offset The maximum value supported by the Barracuda 18LP family drives for REQ/ACK offset is 15 (0Fh). 9.6 Physical interface Figures 9a and 9b show the locations of the drive physical interface components for the various models of the drive. Shown are the locations of the DC power connector, the SCSI interface connector, and the drive select 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 77738479. 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. 9.6.1 DC cable and connector With the exception of the “LC” drives, the drive receives DC power through a 4 pin connector (see Figure 9a 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. Type of cable Connector Contacts (20-14 AWG) 14 AWG MP 1-480424-0 AMP 60619-4 (Loose Piece) AMP 61117-4 (Strip) Model “LC” receives power through the 80 pin I/O connector. See Table 13d.
Barracuda 18LP Product Manual, Rev. E 53 Pin 1P 2P 3P 4P Power +12V +12V ret + 5V ret + 5V J1 Pin 1 J5 Pin 1 J1-DC Power 4P 3P 2P 1P PCBA J5 Pin 1 Pin 1P J1-DC Power J1 Pin 1 68 Pin SCSI I/O Connector J2 J6 Figure 9a. Model “LW” drive physical interface (68 pin J1 SCSI I/O connector) J1 80 Pin SCSI I/O and Power Connector Pin 1 J2 J6 Note: See Table 13d for DC power pin assignments. Figure 9b. Model “LC” drive physical interface (80 pin J1 SCSI I/O connector and DC power connector)
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