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3 Software Architecture

IN THIS CHAPTER

· Validated Build Options

· Binary Naming

· The USB Audio System Architecture

· USB Audio Class Support

· USB Interface

· Audio Endpoints (Endpoint Buﬀer and Decoupler)

· Device Firmware Upgrade (DFU)

· Audio Driver

· Digital Mixer

· S/PDIF Transmit

· S/PDIF Receive

· ADAT Receive

· Clock Recovery

· MIDI

· Audio Controls via Human Interface Device (HID)

· Apple Authentication (iAP)

· Resource Usage

· The USB Audio 2.0 Reference Design (L-Series) Software

· The USB Audio 2.0 DJ Kit (U-Series)

· The USB Audio 2.0 Multichannel Reference Design (L-Series) Software

The following sections describe the system architecture of the XMOS USB Audio

software platform.

3.1 Validated Build Options

As previously described the XMOS USB Audio solution is provided as a framework

with reference design applications provided using this frame work running on a

reference hardware platform.

For each reference design an application is provided which extends and customises

the framework to operate on the particular reference platform.

Due to the ﬂexibility of the framework there are many diﬀerent build options. For

example input and output channel count, Audio Class version, interface types etc

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