LSI SYM8953U - Manual (Page 72)

3.75 pc 10.25 pc 11.25 pc 38.25 pc
4.333 pc
48.583 pc
52.5 pc
34.5 pc
44.25 pc
A-10 Technical Specifications
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 SYM8953U is a four-wire
arrangement that allows the user to connect a LED harness to the board.
The buffered GPIO0_FETCH line (maximum output low voltage 0.4 V
and minimum output low current 16 mA) is pulled low to complete the
circuit when a harness with a 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