DoP

DSD over PCM is an open standard to transmit DSD to a DAC using the PCM format.

 

Normally you need a dedicated player for DSD. Your PC won't play it without converting it to PCM first. A couple of guys formulated an open standard allowing direct playback on a PC. Not only your hardware (DAC) must support it but your media player as well.

 

As XMOS supports this standard and their USB receiver is used in many async USB DACs, probably more DACs will support this standard in the near future.

The bit rate of DSD (2.8224Mbits/sec) looks impressive but it is less than a 24 / 176 PCM. The trick is to pack the DSD in a PCM stream and put a marker in this stream allowing the DAC to discriminate between PCM and DSD.

Native DSD

UAC2 (USB Audio Class 2) has a "RAW" data format also called native DSD.

Indeed it allows for sending DSD straight to a DAC over the USB2.

This make DoP superfluous.

References

DoP Open Standard. Method for transferring DSD Audio over PCM Frames - DSD Guide

DSD-Guide.com

 

USB audio design quide - XMOS 2014

Does "Native DSD" over USB exist? - Emotiva 2018