Compal NBLB2 - CD;DVD and Digital Mode LED Status; Three Host Interface Channels Support; Keyboard and Mouse Interface Transfer Port; Power Management Interface Transfer Port

NBLB2 Service Manual
46
 Play/Pause ( ) – press this button will play Audio CD or pause
playing Audio CD, but if there is DVD in DVD_ROM that will turn on system
automatically.
 Stop/Eject ( ) – press this button will stop playing Audio CD or eject
CD/DVD-ROM tray.
 Next/FF ( ) – press this button will play next track when Audio CD
was playing.
 Previous/Rewind ( ) – press this button will play previous track when
Audio CD was playing.
12.11.3 CD/DVD and Digital mode LED status
 There are two LED indicated which mode that end user to select it. One
is Direct CD LED another one is Digital LED.
 The Direct CD LED was indicted the system in CD/DVD mode. The
Digital LED was indicted the system in Digital mode.
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.