Introduction to the XMOS USB Audio 2.0 Reference Design - YouTube
Douk Audio U2 XMOS XU208 Digital Interface, USB to TOSLINK Coaxial/Optical Audio Adapter, for DAC/Preamp/Amplifier, Support PCM & DSD64 (Upgrade Version): Amazon.com: Industrial & Scientific
BREEZE AUDIO XMOS XU208 USB to I2S digital interface 384kHz/32bit DSD256 - AliExpress
Dev Kits & Debug Adapters | XMOS
SITIME Crystal XU208 XMOS USB Digital Audio Interface U8 Upgrade Asynchronous Amanero Module For ES9038 DAC
Unidentified device XMOS USB Audio 2.0 - Support - Roon Labs Community