MSP3401G datasheet(45/104 Pages) MICRONAS

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PRELIMINARY DATA SHEET

MSP 34x1G

Micronas

3.4. Programming Tips

This section describes the preferred method for initial-

izing the MSP 34x1G. The initialization is grouped into

four sections:

– SCART Signal Path (analog signal path)

– Demodulator

– SCART and I2S Inputs

– Output Channels

See Fig. 2–1 on page 9 for a complete signal flow.

SCART Signal Path

1. Select analog input for the SCART baseband pro-

cessing (SCART DSP Input Select) by means of the

ACB register.

2. Select the source for each analog SCART output

(SCART Output Select) by means of the ACB regis-

ter.

Demodulator

For a complete setup of the TV sound processing from

analog IF input to the source selection, the following

steps must be performed:

1. Set MODUS register to the preferred mode and

Sound IF input.

2. Choose preferred prescale (FM and NICAM) values.

3. Write STANDARD SELECT register.

4. If Automatic Sound Select is not active:

Choose FM matrix repeatedly according to the

sound mode indicated in the STATUS register.

SCART and I2S Inputs

1. Select preferred prescale for SCART.

2. Select preferred prescale for I2S inputs

(set to 0 dB after RESET).

Output Channels

1. Select the source channel and matrix for each out-

put channel.

2. Set audio baseband processing.

3. Select volume for each output channel.

3.5. Examples of Minimum Initialization Codes

Initialization of the MSP 34x1G according to these list-

ings reproduces sound of the selected standard on the

loudspeaker output. All numbers are hexadecimal. The

examples have the following structure:

1. Perform an I2C controlled reset of the IC.

2. Write MODUS register

(with Automatic Sound Select).

3. Set Source Selection for loudspeaker channel

(with matrix set to STEREO).

4. Set Prescale

(FM and/or NICAM and dummy FM matrix).

5. Write STANDARD SELECT register.

6. Set Volume loudspeaker channel to 0 dB.

3.5.1. SCART1 Input to Loudspeaker in

Stereo Sound

<80 00 80 00>

// reset

<80 00 00 00>

<80 12 00 08 02 20>

// source loudspeaker = scart, stereo

<80 12 00 0d 19 00>

// prescale scart

<80 12 00 00 73 00>

// volume main = 0dB

3.5.2. SCART1 Input to Loudspeaker in

3D-PANORAMA Sound

<80 00 80 00>

// reset

<80 00 00 00>

<80 12 00 08 02 20>

// source loudspeaker = scart, stereo

<80 12 00 0d 19 00>

// prescale scart

<80 12 00 00 73 00>

// volume main = 0dB

<80 12 00 48 01 00>

// virtual surround sound: on

<80 12 00 49 40 00>

// Surround spatial effect = 50%

<80 12 00 4a 54 00>

// panorama sound effect = 66%

<80 12 00 4b 00 60>

// Surround mode = 3d_panorama

<80 12 00 4d 00 00>

// Noise Sequencer = off

3.5.3. Noise Sequencer for 3D-PANORAMA Sound

// switch into 3D-PANORAMA sound (s.a.). Then:

<80 12 00 4d 80 a0>

// noise L

[wait for 2 seconds]

<80 12 00 4d 80 b0>

// noise C

[wait for 2 seconds]

<80 12 00 4d 80 c0>

// noise R

[wait for 2 seconds]

<80 12 00 4d 80 d0>

// noise S

[wait for 2 seconds]

// switch back to normal operation

<80 12 00 4d 00 00>

// Noise Sequencer = off

MSP3401G Datasheet(PDF) 45 Page - Micronas

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