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Technical Reference Guide

hp compaq d330 and d530 Series of Personal Computers

Featuring the Intel Pentium 4 Processor

First Edition - June 2003

4-31

The systems covered in this guide utilize the following specialized functions built into the LPC

47B387 I/O Controller:

♦

Power/Hard drive LED control – The I/O controller provides color and blink control for the

front panel LEDs used for indicating system events (refer to Table 4-14).

Intruder sensing – Supported on SFF, DT, MT, and CMT form factors, battery-backed D-

latch logic internal to the LPC47B387 is connected to the hood sensor switch to record hood

(cover) removal.

Hood lock/unlock – Supported on SFF, DT, MT, and CMT form factors, logic internal to the

LPC47B387 controls the lock bar mechanism.

I/O security – The parallel, serial, and diskette interfaces may be disabled individually by

software and the LPC47B387’s disabling register locked. If the disabling register is locked, a

system reset through a cold boot is required to gain access to the disabling (Device Disable)

Processor present/speed detection – One of the battery-back general-purpose inputs (GPI26)

of the LPC47B387 detects if the processor has been removed. The occurrence of this event is

passed to the ICH5 that will, during the next boot sequence, initiate the speed selection

routine for the processor.

Legacy/ACPI power button mode control – The LPC47B387 receives 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.

HP Compaq d330 DT User Manual

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