MEC1404 Datasheet, PDF (199/572 Pages) Microchip Technology – Keyboard and Embedded Controller Products for Notebook PC

MEC140X/1X
12.0 EMBEDDED MEMORY INTERFACE (EMI)
12.1 Introduction
The Embedded Memory Interface (EMI) provides a standard run-time mechanism for the system host to communicate
with the Embedded Controller (EC) and other logical components. The Embedded Memory Interface includes 13 byte-
addressable registers in the Host’s address space, as well as 22 bytes of registers that are accessible only by the EC.
The Embedded Memory Interface can be used by the Host to access bytes of memory designated by the EC without
requiring any assistance from the EC. The EC may configure these regions of memory as read-only, write-only, or
read/write capable.
Note: The Embedded Memory Interface (EMI) is supported for the LPC interface, however, it is not supported for
eSPI.
12.2 Interface
This block is designed to be accessed externally and internally via a register interface.
FIGURE 12-1:
I/O DIAGRAM OF BLOCK
Embedded Memory Interface (EMI)
Host Interface
Clock Inputs
Resets
Interrupts
Signal Description
 2015 - 2016 Microchip Technology Inc.
DS00001956D-page 199