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Technical Reference Guide www.hp.com 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

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Hp DC5850 Manuale Utente Pagina 49