@peipaul @oddiofyl partially correct - it will downsample to PCM (N20) if your DAC is not compatible with DoP on AES interface. In case of DAVE it does accept DSD over PCM (DoP) and that is how N20 outputs DSD64 via its AES out.
Refer to this chart
https://aurenderteam.notion.site/2e2261cddc904b5e9372b4917bfa0aef?v=32b06a95f9a74d3e91d73a3e674c89be