FDC37B72X_07 SMSC [SMSC Corporation], FDC37B72X_07 Datasheet - Page 159

• Manufacturer Part Number: FDC37B72X_07
• Description: 128 Pin Enhanced Super I/O Controller with ACPI Support
• Manufacturer: SMSC [SMSC Corporation]

2.
3.
Enter Configuration Mode
To place the chip into the Configuration State the
Config Key is sent to the chip's CONFIG PORT.
The config key consists of a write of 0x55 data to
the CONFIG PORT.
received correctly the chip enters into the
Configuration State (The auto Config ports are
enabled).
Configuration Mode
The system sets the logical device information
and activates desired logical devices through the
INDEX and DATA ports. In configuration mode,
the INDEX PORT is located at the CONFIG PORT
address and the DATA PORT is at INDEX PORT
address + 1.
Configure the Configuration Registers
Exit Configuration Mode.
Once the initiation key is
160
The desired configuration registers are accessed
in two steps:
a. Write the index of the Logical Device Number
b. Write the address of the desired configuration
Note: if accessing the Global Configuration
Registers, step (a) is not required.
Exit Configuration Mode
To exit the Configuration State the system writes
0xAA to the CONFIG PORT. The chip returns to
the RUN State.
Note: Only two states are defined (Run and
Configuration).
always be ready to enter the Configuration State.
Configuration Register (i.e., 0x07) to the
INDEX PORT and then write the number of the
desired logical device to the DATA PORT
register within the logical device to the INDEX
PORT and then write or read the configuration
register through the DATA PORT.
In the Run State the chip will