HP dc73 Technical Reference Guide: HP Compaq dc7800 Series Business Desktop Co - Page 54
I/O Controller Functions
View all HP dc73 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 54 highlights
System Support ■ Chassis and board ID ■ Hood (cover) sensor and lock detect ■ Media card reader detect ■ S4 state indicator ■ USB port over-current detect ■ Flash security override ■ Serial port detect ■ REQn#/GNTn# sigal control ■ Password enable ■ Boot block enable I/O Controller Functions In addition to the serial and parallel port functions, the SCH5327 I/O controller provides the following specialized functions through GPIO ports: ■ Power/Hard drive LED control for indicating system events (refer to Table 4-8) ■ Hood lock/unlock controls the lock bar mechanism ■ Thermal shutdown control turns off the CPU when temperature reaches certain level ■ Processor present/speed detection detects if the processor has been removed. The occurrence of this event will, during the next boot sequence, initiate the speed selection routine for the processor. ■ Legacy/ACPI power button mode control uses the pulse signal from the system's power button and produces the PS On signal according to the mode (legacy or ACPI) selected. Refer to chapter 7 for more information regarding power management. 4-16 www.hp.com Technical Reference Guide