Seagate ST34501N Product Manual page 73

Cheetah 4LP Product Manual, Rev. B
Notes [ ] for Tables 13a through 13e.
[1] See Section 9.7.1 or 9.6.4.2 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
seconds times drive ID). This and [3] 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.
[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] The conductor number refers to the conductor position (right to left in Figure 16) when using 0.050 inch
(1.27 mm) centerline flat ribbon cable. Other cable types may be used to implement equivalent contact
assignments.
[12] Connector contacts are on 0.100 inch (2.54 mm) centers.
[13] 8-bit devices which are connected to the 16 data bit differential I/O should 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 that are connected to a 16-bit single-ended I/O should have the following signals connected
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 defined.
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