Seagate Elite 9 Handbuch PDF herunterladen (Seite 70)

60 Elite 23 Product Manual, Rev. A

Notes.

[1] Positive logic enables transmitter (+5 V = asserted).

Negative logic enables receivers (0 V = asserted).

[2] Negative logic signal (0 V = asserted).

[3] Total interface cable length should not exceed value given in Section 9.6.3.2 from first SCSI device at

beginning to end of daisy chain. See Section 9.7.2 for signal characteristics.

[4] I/O line terminators. If SCSI device is a Seagate disc drive, terminators and a place to plug them in must

be provided external to the drive by user, systems integrator, or host equipment manufacturer where

needed. The drive has no terminators and there are no provisions on the drive for terminator installation.

[5] Arrangements for connecting terminator power to the terminators must be made by the systems designer.

As a help, drive +5 V power is made available on SCSI bus (“N,” “W,” and “WD” models) for powering

external terminators if the drive option select header jumper TP (Figures 8 and 9a) is installed in rightmost

position “TP.” See pin assignment Table 14 for pins assigned to terminator power.

[6] SCSI I/O line (pin 21) disables I/O circuits if single-ended cable plugged in or cable plugged in upside

down.

[7] SCSI I/O cable ground. See Table 14.

Figure 18. Typical differential I/O line transmitter/receiver and terminators

LSI

XCVR

+5V

5.6K

Transmit/Receive

Enable [1]

Transmit or

Receive

Signal [2]

[3]

Term

Power

[5]

330

Ohm

150

Ohm

330

Ohm

SCSI Device at Beginning of I/O Cable

(usually Host Adaptor/Initiator)

LSI

XCVR

+5V

5.6K

Transmit/Receive

Enable [1]

Transmit or

Receive

Signal [2]

Term

Power

[5]

330

Ohm

150

Ohm

330

Ohm

SCSI Device at End of I/O Cable

(Drive/Target)

[4]

Twisted or Flat

Cable Pair

[4]

DIFFSENS [6]

Disable

DIFFSENS [6]

Disable

[7]

1 2 ... 65 66 67 68 69 70 71 72 73 74 75 ... 83 84

Kommentare zu diesen Handbüchern

Keine Kommentare

Seagate Elite 9 Handbuch Seite 70

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Interne Festplatten Seagate Elite 9