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Chapter 3: Overview of Ethernet Audio Video Bridging
P802.1Qat
This specification defines a Stream Reservation Protocol (SRP) which must be used over
the AVB network. Every listener that intends to receive audio/video AV traffic from a
talker must make a request to reserve that bandwidth. Both the talker and every bridge
device that exists between the talker and the listener has the right to decline this request.
Only if each device is capable of routing the new AV traffic stream without violating the
75% total bandwidth restriction (when taking into account previously granted bandwidth
commitments), will the bandwidth request be successful. However, after granted, this
audio / video stream is reliably routed across the network until the reservation is
removed.
Note:
software task. This software is not provided by the Ethernet AVB Endpoint core.
Typical Implementation
X-Ref Target - Figure 3-2
Figure 3-2
Endpoint refers to a talker or listener device from the example network shown in
Figure
In the implementation, the Ethernet AVB Endpoint core is shown connected to a Xilinx Tri-
Mode Ethernet MAC core, which in turn is connected to an AVB capable network. All
devices attached to this network should be AVB capable to obtain the full Quality of
Service advantages for the AV traffic. This AVB network can be a professional or consumer
network (as illustrated in
32
No hardware components are required for the P802.1Qat specification because this is a pure
Xilinx Device
Audio /
IEEE 1722
Video
Packet
Sources /
Manager
Sinks
Embedded
Processor
System
with TCP/IP
stack
PLB management
Figure 3-2: Example Ethernet AVB Endpoint System
illustrates a typical implementation for the Ethernet AVB Endpoint core.
3-1, as opposed to an intermediate bridge function, which is not supported.
Figure
www.xilinx.com
AV
traffic
Ethernet
Tri-Mode
AVB
Ethernet
Endpoint
MAC
LogiCORE
LogiCORE
legacy
traffic
3-1).
Ethernet
PHY
AVB
network
Ethernet AVB Endpoint User Guide
UG492 September 21, 2010
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