A.2.3 On-Board LED

On-board LEDs are used to indicate the status of the SCSI bus.

The SCSI Activity LED lights when the SCSI bus is transferring information.

A.2.4 The SCSI Busy LED

The SCSI Activity LED interface on the LSIU80ALVD is a four-wire arrangement that allows the user to connect an LED harness to the board. The buffered GPIO0_FETCH line (maximum output low voltage

0.4V and minimum output low current 16 mA) is pulled low to complete the circuit when a harness with an LED is attached. The SCSI Busy LED connector is J4.

Table A.6 LED Connector J4

Signal Name

Pin

 

 

LED+

1

 

 

LED−

2

 

 

LED−

3

 

 

LED+

4

 

 

A-10

Technical Specifications