Silicon Laboratories SiM3U1xx Manual de usuario Pagina 14

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AN726
14 Rev. 0.1
5.7. Play Prerecorded Flash Mode
In play prerecorded flash mode, the system outputs data from the flash at 9.6 kHz.
Figure 14. Play Prerecorded Flash Mode Block Diagram
The firmware reads the compressed data from the flash, decompresses the data using µLaw, performs the EWMA
algorithm, quantizes the data to 9 bits, and outputs the PWM waveform on the EPCA0 module. The remainder-
weighted dithering algorithm is not used at all in this mode since the data LSBs will often be 0s from the
compression algorithm.
Figure 15 shows the data flow for the play prerecorded flash mode.
Figure 15. Play Prerecorded Flash Mode Flow Diagram
Class-D RD Board
SiM3U1xx
Flash
EPCA
R
L
SiM3U1xx
Flash
12-bit
quantization
9-bit
quantization
µLaw
decompression 8
bits to 14 (signed)
EPCA
EWMA
R
L
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