The following figure illustrates a typical implementation for the TEMAC (100/1000 Mbps) core when the optional Ethernet AVB endpoint is included. Endpoint refers to a talker (for example, DVD player) or listener (for example, TV set) device as opposed to an intermediate bridge function that is not supported. In the implementation, the Tri-Mode Ethernet MAC core, with the AVB front end, is connected to an AVB-capable network.
Figure 1 illustrates that the Tri-Mode Ethernet MAC core with the Ethernet AVB Endpoint logic supports two main data interfaces at the user side:
- The AV traffic interface is intended for the Quality of Service audio/video data. Illustrated are several audio/video sources (for example, a DVD player) and several audio/video sinks (for example, a TV set). The Ethernet AVB Endpoint gives priority to the AV traffic interface over the legacy traffic interface, as dictated by IEEE 802.1Q 75% bandwidth restrictions.
- The legacy traffic interface is maintained for best effort Ethernet data: Ethernet as it is known today (for example, a PC surfing the internet). Wherever possible, the priority is given to the AV traffic interface (as dictated by IEEE 802.1Q bandwidth restrictions), but a minimum of 25% of the total Ethernet bandwidth is always available for legacy Ethernet applications.
The AV traffic interface in the previous figure is shown as interfacing to a 1722 Packet Manager block. The IEEE1722 is another standard that specifies the embedding of audio/video data streams into Ethernet Packets. The 1722 headers within these packets include presentation timestamp information. Contact AMD for an engineering solution and for more system-level information.