Very usefull manual. From my point of view there are needs more clearables images.
Text excerpt from page 10 (click to view)
DAC (LSI6: UPD6379GR)
The DAC receives 16-bit serial data output from the DSP. The data contains digital sound data of the melody, chord, bass, and percussion for the right and left channels. The DAC converts the data into analog waveforms and output them to each channel separately.
Synch signal SINC L OUT DAC IC6 UPD6379GR R OUT SI Word clock LRCK WCKO Bit clock CLK
2.2K 0.01 µF
SCK1 Data SO CPU LSI1 UPD913GF-3BA
Data SO DSP LSI2 HG51B277FB SI
Word clock WCKI LRCK Bit clock BCKI BCK
FILTER BLOCK
Since the sound signals from the DAC are stepped waveforms, the filter block is added to smooth the waveforms.
