USB AUDIO 2.0 REFERENCE DESIGN XMOS, USB AUDIO 2.0 REFERENCE DESIGN Datasheet - Page 9

• Manufacturer Part Number: USB AUDIO 2.0 REFERENCE DESIGN
• Description: USB AUDIO 2.0 REFERENCE DESIGN
• Manufacturer: XMOS

Specifications of USB AUDIO 2.0 REFERENCE DESIGN

• Design Resources: USB AUDIO Schematic
• Main Purpose: Audio, Audio Processing
• Embedded: Yes
• Utilized Ic / Part: XS1-L1
• Primary Attributes: Audio data up to 24-bit @ 192kHz
• Secondary Attributes: I²S and S/PDIF
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 880-1017

The following diagrams show the software layout of the code running on the XS1-L1
USB Audio Software Design Guide
chip. Each unit runs in a single thread concurrently with the others units. The lines
show the communication between each functional unit. Due to the MIPS requirement
of the USB driver (see Section 3.13), only six threads can be run on the single core L1
device so only one of S/PDIF transmit or MIDI can be supported.
Endpoint 0
Endpoint buffer
Decoupler
Audio Driver
Device Firmware Upgrade (DFU)
S/PDIF Transmitter or MIDI
Figure 4: L1 Software Thread Diagram (with S/PDIF TX)
Figure 5: L1 Software Thread Diagram (with MIDI I/O)
Document Revision 1.2
9/57