MEC1404 Datasheet, PDF (10/572 Pages) Microchip Technology – Keyboard and Embedded Controller Products for Notebook PC

MEC140X/1X
1.4.3 I2C HOST SYSTEM BLOCK DIAGRAM
CPU
S0 (Main)
Power
Supply
PECI 3.0
Interface
PCH
SPI Interface
(3.3V only)
Shared
Flash
Fans or
General
Use
VCC_PWRGD
TACHs (2)
PWMs (8)
nRESET_OUT,
nRESET_IN,
RSMRST# (GPIO)
2‐pin Debug
32Khz
UART
2‐pin Debug
Trace FIFO
Debug Port
ICSP or JTAG
TFDP
Breathing PWM
MEC14xx
32‐Bit PC Embedded
Controller
LEDs
PS/2
(3x)
KeyScan
SMBus
SMBus/I2C
PS/2
SPI I/F
PS/2
Mouse
PS/2
Keyboard
Keyboard
Battery
Pack
SMBus/I2C
Device (s)
Voltage Monitoring
ADCs (8) (e.g., Thermistors,
Power Supplies)
Voltage Generator
DACs (2) (e.g., DC Controlled
Fans)
VCI_OUT
SYSPWR_PRES
S5 (Suspend)
Power Supply
VCI_OVRD_IN _ACAVCHARGER
VCI_IN[1:0]# _{Power Button(s)}
BGPO
Battery Powered
GPIO
BC‐Link (2x)
GPIOs
BC‐Link
Companion
Chip(s)
Private SPI Flash
(accessible on
KeyScan pins)
1.5 MEC140x Internal Address Spaces
The Internal Embedded Controller can access any register in the EC Address Space or Host Address Space. The LPC
and eSPI Host Controllers can directly access peripheral registers in the Host Address Space. If the I2C interface is
used as the Host Interface, access to all the IP Peripherals is dependent on the EC firmware.
Note: The eSPI and LPC Host Controllers also have access to the SRAM data space via the SRAM Memory
BARs, which is not illustrated below.
DS00001956D-page 10
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