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Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it.

The point is simple Parallel vs Serial DATA

It's all about the DATA . Calling it serial or parallel is BASED ON the DATA . Has been for decades. Still is today.

Parallel printer ports had 8 electrical data lines and those 8-bits were all sent as one byte all at once - - in parallel. Similar for old SCSI.... 8 electrical data lines + parity all bits sent in parallel over all those lines all at once.

Serial interfaces don't do that. They send the DATA as a serial stream sometimes most significant bit (MSB) first, at other times least significant bit (LSB) first, depending on the interface. They do NOT send a full byte or DATA word in parallel all at once.

Call I2S whatever YOU like but based on the DATA [and numerous technical resources] and industry nomenclature it is a serial interface.

I am not missing the point by muddying the topic with supporting signals and the challenges they present and other irrelevant minutia. If the DATA moves serially it is considered to be a serial protocol and interface. Period.





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