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MEC1322

DS00001719D-page 114

 2014 - 2015 Microchip Technology Inc.

9.0

EMBEDDED MEMORY INTERFACE (EMI)

9.1

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.

9.2

Interface

This block is designed to be accessed externally and internally via a register interface.

9.3

Signal Description

There are no external signals associated with this block.

9.4

Host Interface

The registers defined for the Embedded Memory Interface (EMI) are accessible by the System Host and the Embedded

Controller as indicated in Section 9.10, "EC-Only Registers" and Section 9.9, "Runtime Registers".

FIGURE 9-1:

I/O DIAGRAM OF BLOCK

Embedded Memory Interface (EMI)

Signal Description

Clock Inputs

Interrupts

Resets

Host Interface

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