CAM35C44 datasheet(19/50 Pages) SMSC

19 / 50 page

Configuration State

Logical devices in the CAM35C44 can operate in

the run state and/or the configuration state. After

power up the CAM35C44 is in the run state, by

default.

To program the configuration registers the

configuration state must be explicitly enabled.

Entering the Configuration State

To enter the configuration state, a configuration

access key must be written to the config port.

The configuration access key is one byte of 55H

data.

Once the configuration access key has been

written to the config port, the CAM35C44

automatically activates the configuration access

ports and enters the configuration state.

Configuration Select Register

The Configuration Select Register (CSR) is

located at the index port address and must be

initialized with the configuration register index

before the register can be accessed using the

data port.

The CSR can only be accessed when the

CAM35C44 is in the configuration state.

Configuration Register Programming

The

CAM35C44

contains

ten

configuration

registers CR00-CR09.

After the CAM35C44

enters the configuration state, the configuration

registers are programmed by first writing the

index

number

(00

09)

the

configuration select register (CSR) and then

writing or reading the configuration register

contents through the data port.

Configuration register access remains enabled

until the configuration state is explicitly exited.

Exiting the Configuration State

To exit the configuration state one byte of AAH

data must be written to the config port.

Once AAH has been written to the config port,

the CAM35C44 automatically deactivates the

configuration access ports and enters the run

state.

In the run state, configuration register

access cannot occur until the configuration state

is explicitly re-enabled.

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