MSP3421G MICRONAS [Micronas], MSP3421G Datasheet - Page 45

• Manufacturer Part Number: MSP3421G
• Description: Multistandard Sound Processor Family with Virtual Dolby Surround
• Manufacturer: MICRONAS [Micronas]

PRELIMINARY DATA SHEET
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 I
– 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-
2. Select the source for each analog SCART output
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
2. Choose preferred prescale (FM and NICAM) values.
3. Write STANDARD SELECT register.
4. If Automatic Sound Select is not active:
SCART and I
1. Select preferred prescale for SCART.
2. Select preferred prescale for I
Output Channels
1. Select the source channel and matrix for each out-
2. Set audio baseband processing.
3. Select volume for each output channel.
Micronas
cessing (SCART DSP Input Select) by means of the
ACB register.
(SCART Output Select) by means of the ACB regis-
ter.
Sound IF input.
Choose FM matrix repeatedly according to the
sound mode indicated in the STATUS register.
(set to 0 dB after RESET).
put channel.
2
S Inputs
2
S Inputs
2
S inputs
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 I
2. Write MODUS register
3. Set Source Selection for loudspeaker channel
4. Set Prescale
5. Write STANDARD SELECT register.
6. Set Volume loudspeaker channel to 0 dB.
3.5.1. SCART1 Input to Loudspeaker in
<80 00 80 00>
<80 00 00 00>
<80 12 00 08 02 20>
<80 12 00 0d 19 00>
<80 12 00 00 73 00>
3.5.2. SCART1 Input to Loudspeaker in
<80 00 80 00>
<80 00 00 00>
<80 12 00 08 02 20>
<80 12 00 0d 19 00>
<80 12 00 00 73 00>
<80 12 00 48 01 00>
<80 12 00 49 40 00>
<80 12 00 4a 54 00>
<80 12 00 4b 00 60>
<80 12 00 4d 00 00>
3.5.3. Noise Sequencer for 3D-PANORAMA Sound
// switch into 3D-PANORAMA sound (s.a.). Then:
<80 12 00 4d 80 a0>
[wait for 2 seconds]
<80 12 00 4d 80 b0>
[wait for 2 seconds]
<80 12 00 4d 80 c0>
[wait for 2 seconds]
<80 12 00 4d 80 d0>
[wait for 2 seconds]
// switch back to normal operation
<80 12 00 4d 00 00>
(with Automatic Sound Select).
(with matrix set to STEREO).
(FM and/or NICAM and dummy FM matrix).
Stereo Sound
3D-PANORAMA Sound
2
C controlled reset of the IC.
// reset
// source loudspeaker = scart, stereo
// reset
// source loudspeaker = scart, stereo
// virtual surround sound: on
// panorama sound effect = 66%
// prescale scart
// volume main = 0dB
// prescale scart
// volume main = 0dB
// Surround spatial effect = 50%
// Surround mode = 3d_panorama
// Noise Sequencer = off
// noise L
// noise C
// noise R
// noise S
// Noise Sequencer = off
MSP 34x1G
45