USB Audio 2.0 MC Reference Design Quick Start
Version 1.0
Publication Date: 2010/07/07
Copyright © 2010 XMOS Ltd. All Rights Reserved.

---

USB Audio 2.0 MC Reference Design Quick Start (1.0)
2/6
1
Introduction
The USB Audio 2.0 Multichannel Reference Design (XS1-L2 Edition) is a hardware
reference design for a multi-channel USB audio interface using the XMOS XS1-L2
dual-core event-driven processor. It contains a single XS1-L2 device enabling imple-
mentation of a complete USB 2.0 high-speed device compliant with release 2.0 of
the USB Audio Class specification.
The XS1-L2 event-driven processor communicates with the USB host via a ULPI USB
transceiver at the 480Mb/s high-speed rate. The XS1-L2 controls the streaming of
audio data over the USB connection and direct I2S interface to the audio CODEC, dig-
ital streams and MIDI communications. Multiple additional functions (for example
Mixers/DSP) can be implemented by modifications to the standard software.
An XTAG-2 debug adapter can be connected to the development board to provide a
JTAG interface from your development system. To program the board you need to
download a set of free Development Tools from the XMOS website.
www.xmos.com

---

USB Audio 2.0 MC Reference Design Quick Start (1.0)
3/6
1.1
Connectors
The diagram below shows the layout of the connectors on the board:
5
6
7
8
9
10
11
12
4
13
3
14
15
2
16
20
19
1
18
17
1
5V DC Power In
11
Analogue 5/6 OUT (Stereo 3.5mm
Jack)
2
MIDI Input & Output (Via Gameport)
12
Analogue 7/8 OUT (Stereo 3.5mm
Jack)
3
75 BNC Word Clock Input
13
Optical Digital Output

4
Instrument IN (Mono 1/4" Jack)
14
Coaxial Digital Output
5
Microphone IN (Mono 3.5mm Jack)
15
Optical Digital Input
6
Analogue 1/2 IN (Stereo 3.5mm Jack)
16
Coaxial Digital Input
7
Analogue 3/4 IN (Stereo 3.5mm Jack)
17
Expansion Header
8
Analogue 5/6 IN (Stereo 3.5mm Jack)
18
XSYS Debug Interface
9
Analogue 1/2 OUT (Stereo 3.5mm
19
USB B Connector
Jack)
10
Analogue 3/4 OUT (Stereo 3.5mm
20
Push Button Power Switch
Jack)
www.xmos.com

---

USB Audio 2.0 MC Reference Design Quick Start (1.0)
4/6
2
Playing audio using the board
The USB Audio 2.0 Reference Design board requires a USB Audio 2.0 class compliant
driver available on the host. This functionality is built into Mac OS 10.6.4 or later.
A Windows demonstration driver is provided with the board.
1. Install the Windows USB Audio 2.0 demonstration driver, if required.
2. Connect the board to the 5V power supply provided.
3. Connect the board to your USB Audio 2.0 compliant host computer using a high
speed USB 2.0 cable.
4. Press the On/Off button to switch on the board.
The USB LED on the USB Audio 2.0 board is lit when the device is correctly con-
nected and powered up.
5. Connect your audio input/output devices to the connectors on the board.
6. In your audio application, select the USB Audio 2.0 device.
7. Start playing and recording.
3
Programming the board
The XTAG-2 debug adapter supplied with the kit can be connected to the board to
provide a JTAG interface from your development system that you can use to load
and debug software. You need to install a set of drivers for the XTAG-2 debug
adapter and download a set of free Development Tools (10.4 or later) from the
XMOS website:
http://www.xmos.com/tools
Instructions on installing and using the XMOS Tools can be found in the XMOS Tools
User Guide http://www.xmos.com/published/xtools_en. The following table pro-
vides a summary tools support for the USB Audio 2.0 L1 development board.
Minimum tools version required
10.4
Board support file
XR-USB-AUDIO-2.0-MC.xn
USB-to-JTAG adaptor
XTAG-2
USB-to-JTAG driver
XMOS
www.xmos.com

---

USB Audio 2.0 MC Reference Design Quick Start (1.0)
5/6
4
The USB Audio 2.0 Reference Design Software
The latest USB Audio 2.0 Reference Design software is available from XMOS. Please
register at http://www.xmos.com/ and send a request for the software from your
Account page, or contact your local sales representative for further details:
http://www.xmos.com/products/distributors
The software is distributed as an Eclipse archive that you can import into the XDE.
1. Import the software
· Start the Tools and select a workspace.
· Choose File · Import.
· Double-click the General folder, select the Existing Projects into Workspace
option and click Next.
· Double-click the General option, select Existing Projects into Workspace
and click Next. (Do not select the Archive File option as this results in
different behaviour.)
· Browse to the USB Audio 2.0 Reference Design Software archive (ZIP file) and
click Open to import the source code.
2. Build and run the source code on the board
· Click the Build button to compile the project.
· Click the Run button to load the compiled project onto the attached board.
Further details on how to build the project, load it onto the board and debug the
code is contained in the XMOS Tools User Guide.
5
Next Steps
Further information on using the board and Tools is available from:
www.xmos.com/usbaudio2mc
Document History
Date
Release
Comment
2010-07-07
1.0
First release
www.xmos.com

---

USB Audio 2.0 MC Reference Design Quick Start (1.0)
6/6
Disclaimer
XMOS Ltd. is the owner or licensee of this design, code, or Information (collectively, the
"Information") and is providing it to you "AS IS" with no warranty of any kind, express or
implied and shall have no liability in relation to its use. XMOS Ltd. makes no representation
that the Information, or any particular implementation thereof, is or will be free from any
claims of infringement and again, shall have no liability in relation to any such claims.
Copyright © 2010 XMOS Ltd. All Rights Reserved. XMOS and the XMOS logo are registered
trademarks of XMOS Ltd in the United Kingdom and other countries, and may not be used
without written permission. Company and product names mentioned in this document are
the trademarks or registered trademarks of their respective owners. Where those designa-
tions appear in this document, and XMOS was aware of a trademark claim, the designations
have been printed with initial capital letters or in all capitals.
www.xmos.com

---

Document Outline

• Introduction
• Playing audio using the board
• Programming the boar