Am I correct in understanding that the limitation is the AKM DAC chip takes in a DSD stream via its I2S line, and the XMOS handles both USB interfacing and DoP to DSD deencapsulation? Meaning a potential I2S input (suggested elsewhere) could also be capable of receiving a straight DSD stream?
Correct - the XMOS chip handles the DSD input (via USB) and DoP, and I2S is fed to the dual AK4399 d/a chips.
If an external transport can feed a similar DoP stream, then I don't see why a straight DSD stream could not fed in.
I have to admit that I'm not used to seeing I2S lines being used beyond runs just a few inches on a PCB. I would think
that running long lengths (over HDMI) would result in high jitter and defeat the point, but I am NOT saying that is happening
with those who are doing this. I'm sure it is all in the implementation. Just trying to see the benefit.