Three Host Interface Channels Support; Support Three Independent Devices Through Ps/2 Channel Simultaneously; Devices Pnp Configuration - Compal JHL90 Service Manual

• EC will output voltage to control fan directly. (VGA Thermal Policy)
Speed stage
Speed 0
Speed 1
Speed 2
Speed 3
Speed 4
Speed 5
Speed 6
(Throttling start)

12.12 Three host interface channels support

12.12.1 Keyboard and mouse interface transfer port
• One channel is dedicated for the keyboard and mouse data transfer (host
address 60h and 64h). The Keyboard and Mouse channel of KBC is
compatible to the legacy 8042 host interface. It is base on two registers:
Command/Data and Status
• The EC-FW interrupt generates IRQ1 (Keyboard) and IRQ12 (Mouse) for
system.
12.12.2 Power management interface transfer port
• The other channel is for the power management function (host address 62h
and 66h). The Power Management channel of KBC structure and operation
are similar to those of the Keyboard/Mouse channel.
12.12.3 Extra transfer port
• This channel (host address 68h and 6Ch) was created to prevent conflict with
the other channels.
12.13 Support three independent devices through PS/2 channel
simultaneously
• The KBC provides three data transfer channels. Each channel has two quasi-
bidirectional signals that are used for the direct interface to an external
keyboard, mouse or any other PS/2 compatible pointing device.
• The three channels are identical and thus allow the connector ports to be
interchangeable.

12.14 Devices PnP configuration

12.14.1 Hot Plug-and-Play
• The KBC watches both external devices, checking if the devices have recently
been plugged in or unplugged. The Hot plug ability of external PS2 devices
feature detects the attachment or removal of these devices.
Speed down
temperature (°C)
65
90
Speed up
temperature (°C)
75
94
105 (VGA)
(Shutdown temp)
JHL90 Service Manual
Fan 1
RPM
4200
4200
2-35