Toshiba Satellite A40 Series Maintenance Manual page 24

1 Hardware Overview
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
1.2 System Unit Block Diagram
Satellite A40 Maintenance Manual (960-458)