VS1033 Datasheet, PDF (32/70 Pages) List of Unclassifed Manufacturers – MP3/AAC/WMA/MIDI AUDIO CODEC

VLSI
Solution ^y
VS1033a PRELIMINARY
VS1033A
8. FUNCTIONAL DESCRIPTION
8.6.1 SCI MODE (RW)
SCI MODE is used to control the operation of VS1033 and defaults to 0x0800 (SM SDINEW set).
Bit Name
Function
Value Description
0 SM DIFF
Differential
0 normal in-phase audio
1 left channel inverted
1 SM LAYER12
Allow MPEG layers I & II
0 no
1 yes
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 SETTOZERO2 Set to zero
0 right
1 wrong
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
14 SM LINE IN
ADPCM recording selector
0 microphone
1 line in
15 SM CLK RANGE Input clock range
0 12..13 MHz
1 24..26 MHz
When SM DIFF is set, the player inverts the left channel output. For a stereo input this creates virtual
surround, and for a mono input this creates a differential left/right signal.
SM LAYER12 enables MPEG 1.0 and 2.0 layer I and II decoding in addition to layer III. If you enable
Layer I and Layer II decoding, you are liable for any patent issues that may arise. Joint licensing
of MPEG 1.0 / 2.0 Layer III does not cover all patents pertaining to layers I and II.
Software reset is initiated by setting SM RESET to 1. This bit is cleared automatically.
If you want to stop decoding a WAV, WMA, or MIDI file in the middle, set SM OUTOFWAV, and send
data honouring DREQ until SM OUTOFWAV is cleared. SCI HDAT1 will also be cleared. For WMA
and MIDI it is safest to continue sending the stream, send zeroes for WAV.
Bit SM PDOWN sets VS1033 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.
If SM TESTS is set, SDI tests are allowed. For more details on SDI tests, look at Chapter 9.10.
Version 0.6, 2005-01-05
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