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Creating custom applications

To create your own AVB application, the general steps are:

1. Make a copy of the Eclipse project or application directory (the directory starting with app_) you wish to base your code on, to a separate directory with a different name.
2. Make a copy of any modules you wish to alter, and update the Makefile of your new application to use these new custom modules.
3. Make appropriate changes to the code, rebuild and reflash the device for testing.

If you are using a custom board and have made a copy, you need to:

1. Provide a .xn file for your board (updating the TARGET variable in the Makefile appropriately).
2. Update avb_conf.h with the specific defines you wish to set.
3. Update avb_device_defines.h and avb_device_defines.c to provide device specific information to the AVB control API.
4. Update the top level main.
5. Add any custom code in other files you need.

Board Design

The key PCB components for an XMOS AVB solution are:

1. XS1-G4 or XS1-L2 chip
2. 100 Mbit/s MII ethernet phy (100 Mbit)
3. SPI flash for boot image loading and persistent storage
4. PLL/frequency synthesizer chip
5. An audio CODEC or processor

To aid board design please refer to the schematics that can be found at:

http://www.xmos.com/support/documentation.

This page includes reference designs for XMOS chips (including BOM costs). The following schematics show examples connecting to additional hardware:

Schematic	Component
XR-AVB-LC-BRD	XS1-L2, Ethernet, Flash, PLL, Audio CODECs
XC-2	XS1-G4, Ethernet, Flash
XAI Audio Interface	PLL, Audio CODEC, S/PDIF

It is highly recommend to add an XSYS connector for an XTAG2 device onto a board for debugging.