MEC1322 Datasheet, PDF (114/456 Pages) Microchip Technology – Keyboard and Embedded Controller for Notebook PC

MEC1322
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.
FIGURE 9-1:
I/O DIAGRAM OF BLOCK
Embedded Memory Interface (EMI)
Host Interface
Clock Inputs
Resets
Interrupts
Signal Description
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".
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