MEC1632 datasheet(181/636 Pages) MICROCHIP

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 2012-2018 Microchip Technology Inc.

DS00001592B-page 181

MEC1632

IBF

(IBF_OS; ALIASED)

The Input Buffer Full bit is set to indicate that a the ACPI_OS has

written a command or data to the ACPI_EC and that data is ready.

This bit is automatically cleared when data has been read by the

ACPI_EC.

Note:

The setting and clearing of this IBF varies depending on

the setting of the following bits: CMD bit in this register

and Four Byte Access bit in the Byte Control OS-Regis-

ter. Three scenarios follow:

The IBF is set when the ACPI_OS writes to the ACPI OS

COMMAND Register. This same write autonomously sets the

CMD bit in this register.

The IBF is cleared if the CMD bit in this register is set and the

ACPI_EC reads from OS2EC Data EC-Register Byte 0.

Note:

When the CMD bit in this register is set the Four Byte

Access bit in the Byte Control OS-Register has no impact

on the IBF bit behavior.

A write by the ACPI_OS to the ACPI OS Data Register Byte 0

sets the IBF bit if the Four Byte Access bit in the Byte Control

OS-Register is in the cleared to ‘0’ state prior to this write. This

same write autonomously clears the CMD bit in this register.

A read of the OS2EC Data EC-Register Byte 0 clears the IBF bit if

the Four Byte Access bit in the Byte Control OS-Register is in the

cleared to ‘0’ state prior to this read.

A write by the ACPI_OS to the ACPI OS Data Register Byte 3

sets the IBF bit if the Four Byte Access bit in the Byte Control

OS-Register is in the set to ‘1’ state prior to this write. This

same write autonomously clears the CMD bit in this register.

A read of the OS2EC Data EC-Register Byte 3 clears the IBF bit if

the Four Byte Access bit in the Byte Control OS-Register is in the

set to ‘1’ state prior to this read.

An EC_IBF interrupt signals the ACPI_EC that there is data

available. The ACPI Specification usage model is as follows:

The ACPI_EC reads the STATUS EC-Register and sees the

IBF flag set,

The ACPI_EC reads all the data available in the OS2EC DATA

BYTES[3:0]. This causes the IBF bit to be automatically

cleared by hardware.

The ACPI_EC must then generate a software interrupt (See

Note: on page 171) to alert the ACPI_OS that the data has

been read and that the host is free to write more data to the

ACPI_EC as needed.

R0h

nSYS_R

Offset

04h

Bits

Description

Type

Default

Reset

Event

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