ITE EC 架构介绍

ITE 8512Speaker: WY

What’s the EC ?Embedded Controller comes form ACPI structure Host is communicated EC by LPC interface. The I/O port are 60/64 and 62/66 EC integrated ps2 device, keyboard matrix, battery charger, fan control, power sequence, hot key function, backlight, CPU thermal sensor, system power consumption,etc.

System StructureNBLPC

SB

EC PS/2 KB/MS MATRIX FAN Control

ChargerFlash ROM Power Sequence….

Keyboard Controller OverviewHost SystemLPC/Firmware Hub

HIF Scan Matrix Keyboard PS/218 Scan Out (Column)

Scan

ITE KBCI2C

3 PS/2 Devices

8 Scan In (Row)

SMBus

3 SMBus Devices

EC FeatureITE ECPS/2 KB/MSMATRIX ACPI Power management SMBus UART / CIR ADC/DAC PWM Share BIOS KBS Monitor

EC PositionSouth Bridge

LPC BUS Power Management

IT8510E Or IT8512/IT8513

IT8510E -> ISA Bus IT8512/8513 -> SPI Bus

BIOS EEPROM

Share BIOS ArchitectureMax : 16M 64K~16M Byte BIOS ROM Zone

64K KBC ROM Zone 64K Byte KBC ROM Zone 0 Full space 16M Byte Max :16M-64K Byte

BIOS&EC Code Position

Features IBM AT & PS/2 8042-Compitable Host Interfaces

Support all standard Host Commands ACPI Embedded Controller Interface ACPI System Management Bus Interface PS/2 Devices Scan Matrix Keyboard OEM Customization

Features – Host Interface

Host Interfaces Primary Host Secondary

Interface (0x60, 0x64)

HIF1 – 8042 Command Interface

Host Interface (0x62, 0x66)

HIF2 – Logical HIF – ACPI Command Interface HIF3 – Logical HIF – SMI Access Third

Host Interface (0x68,0x6C)

IBM AT & PS/2 8042-Compatible Standard Standard Standard

KBC Commands – 0x64 port KBD Commands - 0x60 port AUX Commands – 0x64 port D4 command

Command HandlerCommand handler 60/64

Is system command?YES

NO

KBD Command

Is D4 command?NO

YES

Mouse Command

KBC Command

Bit 7 6 5 4 3

Keyboard Controller Status Register 64hDescription Parity Error Timeout Error Auxiliary Output Buffer Full Inhibit Switch Command/Data

21 0

System FlagInput Buffer Full ( IBF ) Output Buffer Full (OBF)

Features – Standard KBC CommandsStandard 64 command list Write / Read Keyboard Controller Command Byte (60h / 20h)

The KCCB resides in 8042 RAM location 20h, Address 20h defined in the IBM 8042 programming specification. IBM standard command set, use command 20h to read the KCCB and command 60h to write KCCB.

Default:» 0x65 – PS/2 Mouse Not Present » 0x47 – PS/2 Mouse Present

Controller Command Byte:

Bit[7] - Reserved Bit[6] - Keyboard Translate Bit[5] - Disable Auxiliary Device Bit[4] - Disable Keyboard Bit[3] - Reserved Bit[2] - System Flag Bit[1] - Enable Auxiliary Interrupt Bit[0] - Enable Keyboard Interrupt

Features – Standard KBC Commands

Output Buffer Write Commands: Write

Keyboard Output Buffer (D2h) Write Auxiliary Device Output Buffer (D3h)

Write to Auxiliary Device Co

mmand (D4h) Write

to PS2 Device

Pulse Output Port Commands: Pulse

Both Reset and Gate A20 (FCh) Pulse Gate A20 (FDh) Pulse System Reset (FEh)

Features – Standard KBD CommandsStandard KBD 60 command list

Set / Reset Status Indicators Command (EDh) Echo Command (EEh) Select Alternate Scan Codes Command (F0h) Read Id Command (F2h) Set Typematic Rate/Delay Command (F3h) Enable Command (F4h) Default Disable Command (F5h) Set Default Command (F6h) Set Keys Commands (F7h-FDh) Resend Command (FEh) Reset Command (FFh)

Features – Standard AUX CommandsStandard PS2 64_D4 command list Reset Scaling (E6h) Set Scaling to 2:1 (E7h) Set Resolution (E8h) Status Request (E9h) Set Stream Mode (EAh) Read Data (EBh) Read / Set Wrap Mode (ECh /EEh) Set Remote Mode (F0h) Read Device Type (F2h) Set Sampling Rate (F3h) Enable / Disable Auxiliary Device (F4h / F5h) Set Default (F6h) Reset Auxiliary Device (FFh)

Features – Commands

Extended Controller Commands Specific Functionalities

Access Legacy EC Space Sample A/D Channel Turn On/Off LED’s Access Configuration Table Etc.

Features – ACPI Interface Embedded Controller Interface(0x62/0x66) ACPI fully support Command Set 0x80-Read EC space 0x81-Write EC space 0x82-Burst Enable 0x83-Burst Disable 0x84-Query SCI event

Features – PS/2 Devices Three PS/2 Ports One internal ps2 mouse & two external ps2 device(one keyboard +one mouse) Port 1 & Port 2 – Keyboard & Pointing Devices Port 3 – Touchpad Devices (Internal) Active PS/2 Multiplexing

Hot-plug if Ext.aux device is also attached, send command to it but do not pass Ext. response to the system.

Features – Scan Matrix

All Standard Notebook PC Keys Easy Customization Download

OEM Scan Table in RAM Update Scan Table in ROM

Features – OEM Customization

OEM-Definable Hotkeys -Hotkey, Quick button OEM-Definable SMI / SCI Events -Battery event, System Beep, Thermel throttle event, etc…