Scsi Bus Electrical Characteristics; Auxiliary Connector On 68-Pin Model; Logic Signal Levels - IBM DCAS-32160 - Ultrastar 2.1 GB Hard Drive Specifications

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 :
O u t p u t s :
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 Up is disabled.
Pin #8 is for external LED cathod.
If pin #9 is tied-down to the ground, SCSI Terminator is enabled.
I n p u t H i g h V o l t a g e
I n p u t L o w V o l t a g e
O u t p u t H i g h V o l t a g e
O u t p u t L o w 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 )
= 1 . 0 V d c m a x i m u m ( s i g n a l t r u e )
= 2 . 5 t o 3 . 7 V d c ( s i g n a l a s s e r t e d )
= 0 . 0 t o 0 . 5 V d c ( s i g n a l n e g a t e d )
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Specification