USB Audio Offload Support

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Introduction
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Miscellaneous Signals
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USB Audio Offload provides audio mixing / processing support for USB audio endpoint connected through the xHCI Controller. This is aimed at providing a universal audio offload power benefit across various audio devices connected to the platform and USB audio usage is expected to gain more popularity with the introduction of USB Type-C* connector. These USB audio endpoint will be enumerated by the xHCI Controller SW and only the audio streaming path is peer to the Audio DSP subsystem for DSP FW mixing / processing support. USB Audio Offload capabilities are listed as follows:

Up to 2 audio output streams support

Up to 4 audio input streams support

Provides cadence for 44.1 kHz-based sample rate output

Support isochronous audio stream offload for LS / FS / HS USB audio device

Support synchronous / asynchronous / adaptive modes of isochronous audio streaming

Support non-PCM encoded audio bit stream defined by IEC61937 / IEC60958 standard
- Packetizing into PCM sample format and PCM equivalent rates

I2S / PCM Interface

Direct Attached Digital Microphone (PDM) Interface I2S / PCM Interface