Seagate Barracuda 18LP ST318275LC, Product Manual

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64 Barracuda 18LP Product Manual, Rev. E
Notes [ ] for Tables 13b and 13d.
[1] See Section 9.7.1 for detailed electrical characteristics of these signals.
[2] The conductor number refers to the conductor position when using 0.025-inch (0.635 mm) centerline flat
ribbon cable. Other cables types may be used to implement equivalent contact assignments.
[3] Connector contacts are on 0.050 inch (1.27 mm) centers.
[4] Front panel LED signal; indicates drive activity for host front panel hard drive activity indicator.
[5] Asserted by host to enable Motor Start option (enables starting motor via SCSI bus command).
[6] Asserted by host to enable Delayed Motor Start option (motor starts at power on or after a delay of 12 sec-
onds times drive ID). This and [5] above are mutually exclusive options.
[7] Binary code on A3, A2, A1 and A0 asserted by host to set up SCSI bus ID in drive.
[8] GND provides a means for differential devices to detect the presence of a single ended device on the bus.
Drive will not operate I/O bus at ULTRA-2 data rates if this is grounded.
[9] Signals [4] through [7] are used in place of installing jumpers and cables on option select connectors J2
and J6. See Section 8.1.1 notes.
[10] “NC” means no connection.
[11] 8 bit devices which are connected to the 16 data bit differential I/O shall leave the following signals open:
–DB12 –DB13 –DB14 –DB15 –DBP1 –DB8 –DB9 –DB10 –DB11,
+DB12 +DB13 +DB14 +DB15 +DBP1 +DB8 +DB9 +DB10 +DB11.
8 bit devices which are connected to the 16 data bit single-ended I/O shall have the following signals con-
nected as shown:
to ground: +DB12 +DB13 +DB14 +DB15 +DBP1 +DB8 +DB9 +DB10 +DB11,
open circuit: –DB12 –DB13 –DB14 –DB15 –DBP1 –DB8 –DB9 –DB10 –DB11.
All other signals should be connected as shown.