FDC37B78X 查看數據表（PDF） - SMSC -> Microchip

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FDC37B78X

Enhanced Super I/O Controller with ACPI Support, Real Time Clock and Consumer IR

SMSC -> Microchip 

RUN STATE GPIO DATA REGISTER ACCESS

The GPIO data registers as well as the

Watchdog Timer Control, and the Soft Power

Enable and Status registers can be accessed by

the host when the chip is in the run state if

CR03 Bit[7] = 1. The host uses an Index and

Data port to access these registers. The Index

and Data port power-on default addresses are

0xEA and 0xEB respectively. In the

configuration state the Index port address may

be re-programmed to 0xE0, 0xE2, 0xE4 or

0xEA; the Data port address is automatically set

to the Index port address + 1. Upon exiting the

configuration state the new Index

and Data port addresses are used to access the

GPIO data, Soft Power Status and Enable, and

the Watchdog Timer Control registers.

For example, to access the GP1 data register

when in the run state, the host should perform

an I/O Write of 0x01 to the Index port address

(0xEX) to select GP1 and then read or write the

Data port (at Index+1) to access the GP1

register. Generally, to access any GPIO data

register GPx the host should perform an I/O

Write of 0x0X to the Index port address and then

access GPX through the Data port. The Soft

Power and Watchdog Timer Control registers

are accessed similarly.

PORT

NAME

Index

Data

TABLE 53 - INDEX AND DATA PORTS

PORT

ADDRESS

RUN STATE ACCESS

0xE0, E2, E4, EA 0x01-0x0F

Index address + 1

Access to GP1, Watchdog Timer Control,

GP5, GP6, and the Soft Power Status and

Enable registers (see TABLE 54).

TABLE 54 - RUN STATE ACCESSABLE CONFIGURATION REGISTERS

RUN STATE REGISTER

ADDRESS (INDEX)

REGISTER (CONFIGURATION STATE ADDRESSING1)

0x01

GP1 (L8 - CRF6)

0x03

Watchdog Timer Control (L8 - CRF4)

0x05

GP5 (L8 - CRF9)

0x06

GP6 (L8 - CRFA)

0x08

Soft Power Enable Register 1 (L8-CRB0)

0x09

Soft Power Enable Register 2 (L8-CRB1)

0x0A

Soft Power Status Register 1 (L8-CRB2)

0x0B

Soft Power Status Register 2 (L8-CRB3)

Note 1: These registers can also be accessed through the configuration registers L8 - CRxx, as

shown, when the FDC37B78x is in the configuration state.

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