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25
2 System Board
Devices on the ISA Bus
Little Ben
Little Ben is an HP application specific integrated circuit (ASIC), designed
to be a companion to the Super I/O chip. It connects between the chip-set
and the processor. It contains the following:
•
BIOS timer
❒
hardware wired 50 ms long 880 Hz beep module.
❒
automatic blinker that feeds the LEDs module with a 1 Hz oscillator
signal.
•
security protection (access, flash and anti-virus protection)
❒
For 128, 256 or 512 KB Flash EEPROMs.
❒
For the Ultra I/O space: the Serial EEPROM, serial ports, parallel port
and mass storage drives (disable write on Flexible Disk Drive, disable
boot on any drive, disable use of any embedded drive)
•
hard and soft control for the power supply
•
Advanced power management (APM) version 1.1
•
glue logic (such as programmable chip selects)
Little Ben can be powered by battery, so its consumption has been kept as
low as possible. When
VccState
and
PowerGood
pins are both low, all output
pins are in tri-state mode, except for
RemoteOnBen
which continues to be
driven. This allows the computer to be restarted even after a power loss has
occurred.
When the user requests a ShutDown from the operating system, the
environment is first cleared. Any request to turn off the computer, from the
status panel, or from the operating system, can only be granted if the
computer is not locked by Little Ben’s lock bit (otherwise the power remains
on, a red light is illuminated, and the buzzer is sounded).
General Purpose I/O
Description
GPIO number
Enable remote ON
GPIO0
This signal is used to control a status panel light on HP Vectra 500
GPIO1
Jumper J15. (GPIO2=0 if the jumper is removed, to clear the product ID field)
GPIO2
Screen blanking enabled (GPIO3=0)
GPIO3
Not used. (Depends on an unused setting of jumper J15).
VPP_ON2
Содержание Vectra VE5 3
Страница 1: ...Technical Reference Manual Hardware and BIOS HP Vectra VE series 3 PC ...
Страница 8: ...Contents viii ...
Страница 16: ...8 1 System Overview Documentation ...