Intel® FPGA Streaming Video Protocol Specification

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ID 683397
Date 5/15/2024
Public
Document Table of Contents
Document Table of Contents x
1. About the Intel FPGA Streaming Video Protocol 2. Intel FPGA Streaming Video Protocol Description 3. Intel FPGA Streaming Video Protocol Rules 4. Intel FPGA Streaming Video Full-Raster Protocol 5. Document Revision History for Intel FPGA Streaming Video Protocol Specification
1. About the Intel FPGA Streaming Video Protocol x
1.1. Protocol Signals 1.2. Data Exchange
2. Intel FPGA Streaming Video Protocol Description x
2.1. Metapackets (Full Variants) 2.2. Video Packets
2.1. Metapackets (Full Variants) x
2.1.1. Image Information Packets 2.1.2. End-of-Field Packets 2.1.3. Auxiliary Control Packets
2.1.3. Auxiliary Control Packets x
2.1.3.1. Timestamp Packets 2.1.3.2. Register Update Packets 2.1.3.3. Commit Packets 2.1.3.4. User-defined Auxiliary Control Packets
2.2. Video Packets x
2.2.1. TDATA Pixel Packing 2.2.2. RGB Pixel Packing 2.2.3. YCbCr 444 Pixel Packing 2.2.4. YCbCr 422 Pixel Packing 2.2.5. YCbCr 420 Pixel Packing 2.2.6. Four-Channel Video Pixel Packing 2.2.7. Packing with Multiple Pixels in Parallel 2.2.8. Multiple Pixels in Parallel and Empty Pixels 2.2.9. YCbCr 422 Video with Multiple Pixels in Parallel 2.2.10. Packing RGB444 onto an RGB888 Interface 2.2.11. Packing with Less than 8 bits per Symbol Natively 2.2.12. Interlaced Fields
3. Intel FPGA Streaming Video Protocol Rules x
3.1. Rules for Packets 3.2. Rules for IPs
3.1. Rules for Packets x
3.1.1. Auxiliary Control Packet Rules
4. Intel FPGA Streaming Video Full-Raster Protocol x
4.1. Full-Raster Frame Structure 4.2. Full-Raster Start of Frame 4.3. Full-Raster TDATA Signal Layout 4.4. Full-Raster TREADY Signal 4.5. Full-Raster I/O Signals
4.4. Full-Raster TREADY Signal x
4.4.1. Full-Raster TREADY Handshake Process 4.4.2. Optional TREADY Signal: Receiver Interface 4.4.3. Optional TREADY Signal: Transmitter Interface 4.4.4. Optional Backpressure 4.4.5. Synchronous Pixel Clock Rates I/O Interfaces 4.4.6. Asynchronous Pixel Clock Rates I/O Interfaces
1. About the Intel FPGA Streaming Video Protocol
2. Intel FPGA Streaming Video Protocol Description
3. Intel FPGA Streaming Video Protocol Rules
4. Intel FPGA Streaming Video Full-Raster Protocol
5. Document Revision History for Intel FPGA Streaming Video Protocol Specification

4.4.4. Optional Backpressure

Most of the connectivity video IPs such as SDI, HDMI and DisplayPort do not support backpressure and you can omit or drive high TREADY.

These modules cannot support backpressure because this type of connectivity IP works on a live video stream and uses a synchronous pixel clock rate to drive the video interface. Hence, any TREADY backpressure breaks the video timing relationship.

However, other connectivity IPs have a data packet exchange based on command driven protocols, such as PCIe and Ethernet. Backpressure requires TREADY to process the AXI4-S flow control mechanism and the full-raster compatible interfaces to support an optional TREADY signal. To analyze the effect TREADY has on the backpressure that a transmitter full-raster interface can experience during data transfer, look at the relationship of pixel clock rate between the video interfaces that exchange video data. The two scenarios are:

  • Synchronous pixel clock rates
  • Asynchronous pixel clock rates
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