FDC37M817-MS Standard Microsystems (SMSC), FDC37M817-MS Datasheet - Page 134

• Manufacturer Part Number: FDC37M817-MS
• Manufacturer: Standard Microsystems (SMSC)

Specifications of FDC37M817-MS

• Pin Count: 100
• Lead Free Status / RoHS Status: Compliant

CONFIGURATION SEQUENCE
To program the configuration registers, the
following sequence must be followed:
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 0x55 written to the
CONFIG PORT. Once the configuration key is
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.
1. Enter Configuration Mode
2. Configure the Configuration Registers
3. Exit Configuration Mode.
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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