System Support

4.6.2 GPIO Functions

SB700 Functions

The SB700 South Bridge provides various functions through the use of programmable general purpose input/output (GPIO) ports. These systems use GPIO ports and associated registers of the for the following functions:

■Chassis and board ID

■Front audio/USB detect

■SPI data I/O

■SATA hard drive LED

■Flash security override

■Serial port (COM 2) detect

SIO Controller Functions

In addition to the serial and parallel port functions, the SIO controller provides the following specialized functions through GPIO ports:

■Power/hard drive LED control for indicating system events (refer to Table 4-8)

■Chassis and CPU fan control (PWM)

■PCI Wake control

■Power On/Power Good control

■Power supply fan control

 

Technical Reference Guide

www.hp.com

4-15