USB Audio 2.0 Reference Design XS1-L1 Quick Start
Version 1.0
Publication Date: 2009/10/05
Copyright © 2009 XMOS Ltd. All Rights Reserved.

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Introduction
The USB Audio 2.0 Reference Design (XS1-L1) board is a reference design for pro-
duction audio products that need to implement USB Audio Class 2.0. The board is
available with a software framework that provides USB High Speed and Audio Class
2.0, with options to add additional audio processing, interfaces and peripherals.
The development board, which is powered directly from the USB connection, com-
prises a single XS1-L1 device, 1Mbit SPI FLASH memory, a 24-bit 192kHz stereo
CODEC, USB Standard A Type connector, In/Out 3.5mm stereo jacks and an optical
S/PDIF connector. Two LEDs and two push-button switches are provided.
Green LEDs
20-way XSYS
Push Button
Connector
Switches
13MHz OSC
S/PDIF Optical
Connector
USB PHY
USB Connector
3.5mm Stereo
USB LED
Jacks
SPI Flash
Audio
XS1-L1
Audio
Clocking
Processor
CODEC
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 Design Tools from the XMOS website.
Standard A-Type
20-way IDC
USB Connector
XSYS Connector
USB Transceiver
www.xmos.com

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Playing audio using the board
The USB Audio 2.0 Reference Design board requires a USB Audio 2.0 class com-
pliant driver available on the host. This functionality is built into Mac OS 10.6 or
later. For Windows driver availability, please contact your local sales representative:
http://www.xmos.com/products/distributors.
1. Connect the board to your USB Audio 2.0 compliant host computer using a high
speed USB 2.0 cable.
The USB LED on the USB Audio 2.0 card is lit when the device is correctly connected.
2. Connect your audio output device (speakers or headphones) to the 3.5mm stereo
jacks or optical S/PDIF connector on the board.
3. In your audio application, select the USB Audio 2.0 device.
4. Start playing and recording.
www.xmos.com

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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 Design Tools from the XMOS website (version 9.9 or
later).
3.1
Mac OSX Users
1. Connect the board to your system
· Connect the 20-way IDC header on the XTAG-2 to the XSYS connector on the
board.
· Plug the XTAG-2 into your development system.
The board starts up and flashes the LEDs on the card.
2. Download and install the tools
· Go to: http://www.xmos.com/downloads and download the Design Tools.
· Double-click the downloaded DMG file to open it, and then drag the XMOS
icon into your Applications folder.
· When the tools have been installed, eject the DMG file (CMD+E) and drag it
to the Trash to delete it.
3. Start the tools
· Run the XDE.app file from Finder (in the installation directory) to start the
Design Tools.
· Click OK when prompted to select a workspace.
You are now ready to import the USB Audio 2.0 Reference Design Software. See
Section 4.
www.xmos.com

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3.2
Windows Users
1. Connect the board to your system
· Connect the 20-way IDC header on the XTAG-2 to the XSYS connector on the
board.
· Plug the XTAG-2 into your development system.
· Click No when the New Hardware prompt is displayed on screen asking you
to connect to Windows Update.
· Click Next .
· Select Install from list and then click Advanced .
· Browse to the drivers installation directory (default Program Files/XMOS/Desk-
top Tools/version/drivers/xtag2) and select the XTAG-2 file.
· Click Next and follow the instructions on screen.
· Click Finish to complete the driver installation.
2. Download and install the tools
· Go to: http://www.xmos.com/downloads and download the Tools.
· Run the Windows Installer to install the tools. Follow the instructions on
screen.
3. Start the tools
· Select Start · Programs · XMOS · Desktop Tools · version · XMOS De-
velopment Environment to start the Tools.
· Click OK when prompted to select a workspace.
You are now ready to import the USB Audio 2.0 Reference Design Software. See
Section 4.
www.xmos.com

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The USB Audio 2.0 Reference Design Software
The USB Audio 2.0 Reference Design software is available from XMOS. Please 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/usbaudio2
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.
www.xmos.com

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Document Outline

• Introduction
• Playing audio using the board