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Aug 20, 2016, 03:57 AM
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Death of TOSLINK

It was disappointing to discover TOSLINK was not decoded by a SOC but a very complicated, shielded board. The key component was the YSS908, an undocumented Yamaha chip which had the DAC & multiplexed all the inputs. The SDA & SCK pins revealed an I2C interface. Mike Harrison could reverse engineer it, but a better waste of time would be to use a more modern digital format than TOSLINK. The only reason for the cable was the amplifier being limited to just that. It's a miracle last year's Macbook still supported TOSLINK because of the number of legacy amplifiers.

For the moment, it's back to ages old RCA cables again. For the tone control, it would make more sense to use a digital input with EQ in a microcontroller than an op-amp. A TOSLINK decoder could be made out of a modern microcontroller, for the true believers.
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