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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 over a 100 audio channels over 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 and DSP processing often required in AVB endpoints.

AVB Endpoint

Software Reference Design

The AVB Audio software reference design is free of charge and is released under a royalty free license. To request the software, please register on this site and then send a request from the Reference Designs section of your Profile page. The software reference design contains the following components:

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

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

* 802.1Qat, IEEE 1722.map and Zeroconf are only available in version 5v0 of the software reference design, which is currently only supported on XS1-L2 devices such as the Low-cost AVB Audio Endpoint Kit
** Optional free software components available from XMOS

Development Kits

XMOS offers a range hardware options for the evaluation and development of products based on our AVB audio reference design software. The table below outlines common configurations:

ConfigurationKits
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. Low-cost AVB Audio Endpoint Kit
Single 100Mb endpoint with high quality clock recovery using a PLL, 8ch out/6ch in analog via 3.5mm jacks and S/PDIF out/in XS1-G Development Kit (XDK)
Single 100Mb endpoint with two ports (supporting a daisy chain topology) with headers for user connection to CODEC via I2S/I2C and optional PLL for improved clock quality XC-3 Ethernet Kit
Single 1Gbit endpoint with high quality clock recovery using a PLL, 8ch out/6ch out analog via 3.5mm jacks with S/PDIF out/in Please contact XMOS

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