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Seitenansicht 5
2 Hardware Platforms
IN THIS CHAPTER
· USB Audio 2.0 Hardware Reference Design (L-Series)
· USB Audio 2.0 Multichannel Hardware Reference Design (L-Series)
· USB Audio 2.0 DJ Kit (U-Series)
The following sections describe the hardware platforms that support development
with the XMOS USB audio software platform.
2.1 USB Audio 2.0 Hardware Reference Design (L-Series)
The USB Audio 2.0 Reference Design (L-Series)
6
is a hardware reference design
available from XMOS. The diagram in Figure 1 shows the block layout of the USB
Audio 2.0 Reference Design board. The main purpose of the XS1 L-Series device is
to provide a USB Audio interface to the USB PHY and route the audio to the audio
CODEC and S/PDIF output. Note that although the software supports MIDI, there
are no MIDI connectors on the board. For full details please refer to the hardware
manual found on the XMOS website.
13MHz
Oscillator
USB
Series B
Receptacle
1.8V LDO
3.3V LDO
1.0V DC-DC
4.3V LDO
User
LEDs
Push-button
Switches
Audio Master
Clock Oscillator
Produces
24.576MHz
or
11.2896MHz
USB
Transceiver
USB3318
Passive
LPF
‘-244
Stereo
TRS Jack
‘-244
Stereo
TRS Jack
Passive
LPF
24 bit 192kHz
Stereo Audio
CODEC
CS4270
USB
High Speed
480Mb/s
+5V VBus
8’.’
Tile
Supply
CODEC
Analogue
Supply
ULPI
I2S
Analog Out
1Vrms at
Full Scale
Analog In
2Vrms at
Full Scale
JTAG
SPI
MCLK
S/PDIF
XSYS
Debug
1MBit
FLASH
Resync
Optical
Digital Audio
Transmitter
Figure 1:
USB Audio
2.0 Reference
Design Block
Diagram
6
http://www.xmos.com/products/development-kits/usbaudio2
REV 6.1
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