VS1103B Datasheet, PDF (34/61 Pages) List of Unclassifed Manufacturers – MIDI/ADPCM AUDIO CODEC

VLSI
Solution ^y
VS1103b
VS1103B
6. FUNCTIONAL DESCRIPTION
Only user areas in X, Y, and instruction memory are listed above. Other areas can be accessed, but should
not be written to unless otherwise specified.
6.6.9 SCI IN0 and SCI IN1 (R)
SCI IN0 and SCI IN1 are used for offering SCI stream data and for reading encoded ADPCM Stream 4
data.
The bits in the registers are as follows:
Register
SCI IN0
SCI IN0
SCI IN1
SCI IN1
R/W
Read
Write
Read
Read
Bits/
15:0
15:0
15:8
7:0
Description
Read one word from Stream 4
Write one word to SCI sourced stream
Number of words ×8 that can be read from SCI IN0 (Stream 4)
Number of words ×8 that can be written to SCI IN0 (SCI sourced stream)
Note: Data word length is 16 bits.
Example: If reading SCI IN1 returns 0x0312, then 0x03×8 words = 24 words = 48 bytes can be read
from SCI IN0 and 0x12×8 words = 144 words = 288 bytes can be written to SCI IN0.
6.6.10 SCI AIADDR (RW)
SCI AIADDR indicates the start address of the application code written earlier with SCI WRAMADDR
and SCI WRAM registers. If no application code is used, this register should not be initialized, or it
should be initialized to zero. For more details, see Application Notes for VS10XX.
6.6.11 SCI VOL (RW)
SCI VOL is a volume control for the player hardware. For each channel, a value in the range of 0..254
may be defined to set its attenuation from the maximum volume level (in 0.5 dB steps). The left channel
value is then multiplied by 256 and the values are added. Thus, maximum volume is 0 and total silence
is 0xFEFE.
Example: for a volume of -2.0 dB for the left channel and -3.5 dB for the right channel: (4*256) + 7
= 0x407. Note, that at startup volume is set to full volume. Resetting the software does not reset the
volume setting.
Note: Setting SCI VOL to 0xFFFF will activate analog powerdown mode.
Version 1.01, 2007-09-03
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