Compaq dc5850 Technical Reference Guide: HP Compaq dc5850 Series Business Desk - Page 49
GPIO Functions
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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