IBM DCAS-32160 - Ultrastar 2.1 GB Hard Drive, Specifications

Page: 39 / 232

6.1.5 SCSI Bus Electrical Characteristics
The interface logic signals has the following electrical specifications. Details should be referred to ANSI
X3T10/1071D.
I n p u t s : I n p u t H i g h V o l t a g e = 1 . 9 V d c m i n i m u m ( s i g n a l f a l s e )
I n p u t L o w V o l t a g e = 1 . 0 V d c m a x i m u m ( s i g n a l t r u e )
O u t p u t s : O u t p u t H i g h V o l t a g e = 2 . 5 t o 3 . 7 V d c ( s i g n a l a s s e r t e d )
O u t p u t L o w V o l t a g e = 0 . 0 t o 0 . 5 V d c ( s i g n a l n e g a t e d )
Figure 18. Logic Signal Levels
6.1.6 Auxiliary Connector on 68-pin Model
The 68-pin models contain Auxiliary Connector between power connector and 68-pin SCSI connector in
addition to Option Jumper Block. The setting at Option Jumper Block and the Auxiliary Connector work
as logical OR.
Pin #1,3,5,7 specify SCSI-ID as -DAS0,1,2,3. Tie-down to the ground is to assert.
If pin #4 is tied-down to the ground, Auto Spin U p is disabled.
Pin #8 is for external L E D cathod.
If pin #9 is tied-down to the ground, SCSI Terminator is enabled.
Specification
25