UPD9971 datasheet(46/112 Pages) RENESAS

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µPD9971

Data Sheet S17455EJ2V0DS

5.8 Digital Mixing Block

Figure 5-9 Digital Mixing Block

Audio

DAC

MELLSW[1:0],

MELRSW[1:0]

DACLMIX[1:0],

DACRMIX[1:0]

DACLSW[1:0],

DACRSW[1:0]

L-ch

R-ch

L-ch

STADIG

MELLMIX[1:0],

MELRMIX[1:0]

DACLMIX

Audio serial I/F

(ASI)

DACLSW

DACRSW

R-ch

L-ch

DACRMIX

Audio serial I/F

(ASI)

MELLMIX

Melody

3D positioning

MELLSW

MELRSW

R-ch

L-ch

MELRMIX

Melody

3D positioning

Audio

DAC

Audio serial I/F

(ASO)

Audio serial I/F

(ASO)

This block has the following functions:

• Mixes digital signals input from the audio serial interface and output from the sound generator. (The mixing can

be performed only when the fs = 32 kHz.)

• Outputs the mixed digital data to the ASIO and Audio DAC blocks.

• Equipped with selectors to select channels. The selector names and the selectable channels are as follows:

Through (L-ch

→ L-ch and R-ch → R-ch); Channel inversion (L-ch → R-ch and R-ch → L-ch); Monaural (L-ch

→ L-ch + R-ch and R-ch → L-ch + R-ch); Mute (L-ch → no output and R-ch → no output).

In the case of the monaural selector, first, the L-ch and R-ch are divided by two then added.

• Receives power supply from DVDD.

This block operates when the STADIG bit is set to the high level.

UPD9971 Datasheet(PDF) 46 Page - Renesas Technology Corp

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