MEC1632 datasheet(170/636 Pages) MICROCHIP

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MEC1632

DS00001592B-page 170

 2012-2018 Microchip Technology Inc.

9.0

ACPI EMBEDDED CONTROLLER INTERFACE (ACPI-ECI)

9.1

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.

Note 9-1

The EC host in Table 9-8 & Table 9-10 corresponds to the EC in the ACPI specification. This

interface is referred to elsewhere in this chapter as ACPI_EC.

Note 9-2

The LPC host in Table 9-8 & Table 9-10 corresponds to the “System Host Interface to OS” in the

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

9.2

References

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

poration Intel Corporation Microsoft Corporation Phoenix Technologies Ltd. Toshiba Corporation

9.3

Terminology

9.4

Interface

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

TABLE 9-1:

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 “System Host

Interface to OS”.

ACPI_OS terminology is not meant to distinguish the ACPI System Management from

Operating System but merely the hardware path upstream towards the CPU.

FIGURE 9-1:

ACPI EMBEDDED CONTROLLER INTERFACE (ACPI-ECI) I/O DIAGRAM

Host Interface

ACPI Embedded Controller

Interface (ACPI-ECI)

EC Interface

EC_IBF

EC_OBF

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