Compaq W4000 Technical Reference Manual page 87

The systems covered in this guide utilize the following specialized functions built into the LPC
47B367 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 as listed below:
System Status
S0: System on (normal operation)
S1: Suspend
S3: Suspend to RAM
S4: Suspend to disk
S5: Soft off
Processor not seated
CPU thermal shutdown
ROM error
Power supply crowbar activated
System off
NOTE:
[1] Later systems using PCA#s 011305, 011308, or 011311 will power down for this condition.
♦ Intruder sensing – Used on Small Form Factor and Desktop models, battery-backed D-latch
logic internal to the LPC47B367 is connected to the hood sensor switch to record hood
(cover) removal.
♦ Hood lock/unlock – Used on Small Form Factor and Desktop models, logic internal to the
LPC47B34x controls the lock bar mechanism.
♦ I/O security – The parallel, serial, and diskette interfaces may be disabled individually by
software and the LPC47B367'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)
register.
♦ Processor present/speed detection – One of the battery-back general-purpose inputs (GPI26)
of the LPC47B367 detects if the processor has been removed. The occurrence of this event is
passed to the ICH2 that will, during the next boot sequence, initiate the speed selection
routine for the processor. The speed selection function replaces the manual DIP switch
configuration procedure required on previous systems.
♦ Legacy/ACPI power button mode control – The LPC47B367 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.
Power LED
Steady green
Blinks green @ 1 Hz
Blinks green @ 1 Hz
Blinks green @ 0.5 Hz
Off - clear
Steady red
Off (system powers down)
Blinks red @ 1 Hz
Blinks red @ 0.5 Hz
Off
Compaq Evo and Workstation Personal Computers
Featuring the Intel Pentium 4 Processor
Second Edition - January 2003
Technical Reference Guide
HD LED
Green w/HD activity
Off
Off
Off
Off
Off
Off (system powers down)
Off
Off
Off
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