VS1002D Datasheet, PDF (26/54 Pages) List of Unclassifed Manufacturers – MP3 AUDIO CODEC

VLSI
Solution ^y
VS1002d
VS1002D
8. FUNCTIONAL DESCRIPTION
8.6.1 SCI MODE (RW)
SCI MODE is used to control operation of VS1002d. Note that this register is not reset to 0, but to
0x0800 (i.e. SM SDINEW is set).
Bit Name
Function
Value Description
0 SM DIFF
Differential
0 normal in-phase audio
1 left channel inverted
1 SM SETTOZERO Set to zero
0 right
1 wrong
2 SM RESET
Soft reset
0 no reset
1 reset
3 SM OUTOFWAV Jump out of WAV decoding
0 no
1 yes
4 SM PDOWN
Powerdown
0 power on
1 powerdown
5 SM TESTS
Allow SDI tests
0 not allowed
1 allowed
6 SM STREAM
Stream mode
0 no
1 yes
7 SM PLUSV
MP3+V active
0 no
1 yes
8 SM DACT
DCLK active edge
0 rising
1 falling
9 SM SDIORD
SDI bit order
0 MSb first
1 MSb last
10 SM SDISHARE Share SPI chip select
0 no
1 yes
11 SM SDINEW
VS1002 native SPI modes
0 no
1 yes
12 SM ADPCM
ADPCM recording active
0 no
1 yes
13 SM ADPCM HP ADPCM high-pass filter active 0 no
1 yes
When SM DIFF is set, the player inverts the left channel output. For a stereo input this creates a virtual
surround, and for a mono input this effectively creates a differential left/right signal.
By setting SM RESET to 1, the player is software reset. This bit clears automatically.
When the user decoding a WAV file wants to get out of the file without playing it to the end, set
SM OUTOFWAV, and send zeros to VS1002d until SM OUTOFWAV is again zero. If the user doesn’t
want to check SM OUTOFWAV, send 128 zeros.
Bit SM PDOWN sets VS1002d into software powerdown mode. During powerdown, no audio is played
and no SDI operations are performed. For best results, set SCI VOL to 0xFFFF before activating soft-
ware powerdown. Note that software powerdown is not nearly as power efficient as hardware powerdown
activated with the XRESET pin.
Version 1.0, 2005-04-27
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