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HP Vectra VL 5/xxx Series 5 User Manual

Page 74

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74

4 Summary of the HP/Phoenix BIOS

Power Saving and Ergonometry

dog timer detects that the BIOS is inactive (and not reloading the timer
once every 6 seconds), the computer is turned off without further BIOS
acknowledgment.

The following table summarizes the main signals that drive or are driven by
the Little Ben chip.

1.

➹ indicates triggered on a rising edge; ➷ indicates triggered on a falling

edge

Signal

1

Address

Description

SMI_OFF

User wants to power off: computer enters RPO shutdown mode
(computer clock, HDDs all stopped; only RTC, Little Ben and
network board still active)

SMI_RWU ➹

pin 69, LBen channel 7 Signal from RTC, FAX, control panel, and power key on keyboard.

Magic Frame from network board: computer wakes up from RPO
mode.

CoffeeBreak# ➷

pin 66, LBen channel 0 Connected to the lock button (coffee break) on the control panel.

ASL# ➷

pin 65, LBen channel 4 Connected to the Super IO Auto Soft Lock (ASL) timer.

Reset by an interrupt from the keyboard or mouse.

APM chip-set SMI# ➷ pin 67, LBen channel 2 SMIs from the chip set pass first to Little Ben, then are sent on to

the processor on the SMI# line

SMI#

StopClk#

Stops the processor clock

SMI_CONFIG

Tells Little Ben that the processor is in SMM

SMI_ACT#

SMI_TRIG_EN

SMI channels

index Ah

Used to enable individual SMI channels during the boot process

SMI_EN

index Bh, bit 0

Enable general SMI generation (during the boot process)

SMI status register

index 10h

This register is cleared when the computer is re-booted

SM

index 11h, bit 1

When set, computer mains button is disabled

index 11h, bit 2

When set, Flash ROM is write protected; Super IO space is write
protected (Serial EEPROM access, serial ports configuration,
parallel port configuration, flexible disk drive configuration)

index 11h, bit 4

When set, flexible disk drive is write protected

PWD_EN

pin 21
index Dh, bit 3

Not used

Super Secure Mode

pin 64 (shared with
FLPWPT#)

Not used