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AVB

Audio Video Bridging (IEEE 802.1 AVB and IEEE 1722/1733) provides transport for AV streams across mixed use networks with a very high quality of service. XMOS has developed a flexible, software-only implementation of AVB audio which is configurable to support a simple stereo pair to 32 duplex audio channels over 100 Mbit Ethernet. The deterministic architecture of XMOS devices is a perfect match for the low latency, time synchronized nature of AVB. XMOS devices also provide the ability to integrate digital audio interfacing, control functionality using TCP/IP or IEEE 1722.1 and DSP processing often required in AVB endpoints.

Software Reference Design

The AVB Audio software reference design is free of charge and is released under a royalty free license. It contains the following components:

802.1as
Timing synchronization		 802.1Qav
Flow control
TCP/IP
Control protocol		 I2S (including TDM)
CODEC interface
802.1Qat
Stream reservation protocol		 IEC 61883-6
Audio format for P1722
IEEE 1722.MAAP
MAC address acquisition protocol		 IIC, GPIO
IC configuration and general purpose I/O
IEEE P1722
Encapsulation protocol		 Ethernet MAC
Network interface
IEEE 1722.1
Discovery and control		 S/PDIF, ADAT, DSP processing *

* Optional free software components available from XMOS

The latest development tree for the AVB Software Reference Design is available from the XCore Open Source Project (github.com/xcore).

Development Kit

Low-cost AVB Audio Endpoint Kit

Low-cost AVB Audio Endpoint

Two 100Mbit endpoints with high quality clock recovery using a PLL, 2ch out/2ch out analog via 3.5mm jacks with headers for connection to external CODEC via I2S/I2C.
Infocomm 2012