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MEC1322

DS00001719D-page 128

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10.0 ACPI EMBEDDED CONTROLLER INTERFACE (ACPI-ECI)

10.1

Introduction

The ACPI Embedded Controller Interface (ACPI-ECI) is a Host/EC Message Interface. The ACPI specification defines

the standard hardware and software communications interface between the OS and an embedded controller. This inter-

face allows the OS to support a standard driver that can directly communicate with the embedded controller, allowing

other drivers within the system to communicate with and use the EC resources; for example, Smart Battery and AML

code.

The ACPI Embedded Controller Interface (ACPI-ECI) provides a four byte full duplex data interface which is a superset

of the standard ACPI Embedded Controller Interface (ACPI-ECI) one byte data interface. The ACPI Embedded Control-

ler Interface (ACPI-ECI) defaults to the standard one byte interface.

The MEC1322 has two instances of the ACPI Embedded Controller Interface.

The EC host in Table 10-8 and Table 10-10 corresponds to the EC in the ACPI specification. This interface is

referred to elsewhere in this chapter as ACPI_EC.

The LPC host in Table 10-8 and Table 10-10 corresponds to the “System Host Interface to OS” in the ACPI

specification. This interface is referred to elsewhere in this chapter as ACPI_OS.

10.2

References

• Advanced Configuration and Power Interface Specification, Revision 4.0 June 16, 2009, Hewlett-Packard Corpo-

ration Intel Corporation Microsoft Corporation Phoenix Technologies Ltd. Toshiba Corporation

10.3

Terminology

TABLE 10-1:

TERMINOLOGY

Term

Definition

ACPI_EC

The EC host corresponding to the ACPI specification interface to the EC.

ACPI_OS

The LPC host corresponding to the ACPI specification interface to the “Sys-

tem Host Interface to OS”.

ACPI_OS terminology is not meant to distinguish the ACPI System Man-

agement from Operating System but merely the hardware path upstream

towards the CPU.

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