FDC37M607 datasheet(123/182 Pages) SMSC

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123

CONFIGURATION SEQUENCE

To program the configuration registers, the

following sequence must be followed:

1. Enter Configuration Mode

2. Configure the Configuration Registers

3. Exit Configuration Mode.

Enter Configuration Mode

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

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.

The

desired

configuration

registers

are

accessed in two steps:

a. Write the index of the Logical Device

Number Configuration Register (i.e., 0x07)

to the INDEX PORT and then write the

number of the desired logical device to the

DATA PORT

b. Write

the

address

the

desired

configuration register within the logical

device to the INDEX PORT and then write

or read the configuration register through

the DATA PORT.

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). In the Run State the chip will

always be ready to enter the Configuration

State.

Programming Example

The following is an example of a configuration

program in Intel 8086 assembly language.

;----------------------------.

; ENTER CONFIGURATION MODE

;----------------------------'

MOV DX,3F0H

MOV AX,055H

OUT DX,AL

;----------------------------.

; CONFIGURE REGISTER CRE0,

; LOGICAL DEVICE 8

;----------------------------'

MOV DX,3F0H

MOV AL,07H

OUT DX,AL ; Point to nLD Config Reg

MOV DX,3F1H

MOV AL, 08H

OUT DX,AL; Point to Logical Device

;

MOV DX,3F0H

MOV AL,E0H

OUT DX,AL

; Point to CRE0

MOV DX,3F1H

MOV AL,02H

OUT DX,AL

; Update CRE0

;----------------------------.

; EXIT CONFIGURATION MODE

;----------------------------'

MOV DX,3F0H

MOV AX,0AAH

OUT DX,AL

FDC37M607 Datasheet(PDF) 123 Page - SMSC Corporation

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