Toshiba A40 manual Kbc

1 Hardware Overview 1.2 System Unit Block Diagram

‰VGA Controller

Included in the North Bridge

‰Sound Controller

AC 97’ Link (in the South Bridge) is used.

•Amplifier, internal stereo speakers, stereo headphone connector, external microphone connector and volume control knob are mounted.

‰EC/KBC (Embedded Controller/Keyboard Controller)

One SMSC LPC-47N259 micon chip functions as both EC and KBC.

•EC

This controller controls the following functions:

–Power supply sequence

–Thermal conditions

–LEDs

–Beep

–Device ON/OFF

–Fan speed

–Universal I/O port

–Docker Docking Sequence

–Battery capacity check

–Forced reset

–Flash rewriting

–EC interface

–I2C communication

–EC access

–Slim Select Bay Control

•KBC

This controller has the following functions:

–Scan controller to check status of keyboard matrix

–Interface controller between the keyboard scan controller and the system

–Control of switching and simultaneous operation of the accupoint/external PS/2 mouse and of the internal keyboard/external PS/2 keyboard

‰PSC (Power Supply Controller)

•One Toshiba TMP87PM48U chip is used.

•This controller controls the power sources.

1-10 Satellite A40 Maintenance Manual (960-458)