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

Software

The USB Audio 2.0 Multichannel Reference Design is an application of the USB audio

framework speciﬁcally for the hardware described in §2.1 and is implemented on

an L-Series dual tile device (1000MIPS). The software design supports up to 16

channels of audio in and 10 channels of audio out and supports sample frequencies

up to 192 kHz and uses the following components:

· XMOS USB Device Driver (XUD)

· Endpoint 0

· Endpoint buﬀer

· Decoupler

· Audio Driver

· Device Firmware Upgrade (DFU)

· Mixer

· S/PDIF Transmitter

· S/PDIF Receiver

· ADAT Receiver

· Clockgen

· MIDI

Figure 29 shows the software layout of the USB Audio 2.0 Multichannel Reference

Design.

3.20.1 Clocking

For complete clocking ﬂexibility the dual tile L-Series reference design drives a

reference clock to an external fractional-n clock multiplier IC (Cirrus Logic CS2300).

This in turn generates the master clock used over the design. This is described in

§3.13.

3.20.2 Validated Build Options

The reference design can be built in several ways by changing the option described

in §5.1. However, the design has only been validated against the build options as

set in the application as distributed with the following four variations.

REV 6.1

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