HP 7800 Spécifications télécharger pdf (Page 54)

4-16 www.hp.com Technical Reference Guide

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.

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HP 7800 Spécifications Page 54