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2 gpio functions – HP DC5850 User Manual

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Technical Reference Guide

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4-15

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