Video and Vision Processing Suite Intel® FPGA IP User Guide

ID 683329
Date 4/04/2022

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3.1. Auxiliary Control Packets

Full variant video and vision processing IPs may transmit other types of auxiliary control packet, such as timestamp packets to synchronize with audio or other types of auxiliary control packets. You can define auxiliary control packets, which contain information such as active format description (AFD) or closed captioning.

IPs propagate auxiliary control packets with the video data packets. IPs such as the video frame buffer observe rules that determine how to handle auxiliary control packets.

Figure 6. Auxiliary control packet positions.The figure shows an example where two auxiliary control packets precede an image information packet and a third precedes an end of frame packet.

Auxiliary control packets in between image information packets and video packets, or in between adjacent data packets contravene the Intel FPGA streaming video protocol. IPs presented with metapackets in these locations exhibit undefined behavior and the system may break.

In the figure, the video field described by the image information packets, video and end of field packets has three auxiliary control packets. If the frame buffer receives these packets, the IP processes them in the same way as the video field. The IP potentially drops or repeats them.

Auxiliary control packets only occupy the low 16 bits of the TDATA bus.

For TDATA widths greater than16 bits, to adapt to a different interface, do not use standard AXI4-Stream converters. Use the protocol converter IPs.