HP Vectra VL 5/xxx Series 5 User Manual
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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