Video and Image Processing Suite User Guide

ID 683416
Date 2/12/2021

A newer version of this document is available. Customers should click here to go to the newest version.

Document Table of Contents 12G-SDI with Clocked Video Input II

You can configure the CVI II IP core to allow 12G-SDI packets pass into the Avalon-ST video domain.

The 12G-SDI option uses the two-sample interleave (2SI) pattern, which transmits two lines simultaneously, The simultaneous transmission of two lines means that the active width received by the CVI II IP core in between two sets of horizontal SYNC is two times the actual width. The CVI II IP core applies the appropriate scaling before reporting to the Active Sample Count status register and the Avalon-ST video control packet. The 2SI pattern also requires that the clocked video input to be remapped to raster scan order for processing in a VIP pipeline. The CVI II IP core performs the remapping.

Figure 35. Clocked Video Capture of 12G-SDI Mapping and Resampling (Remapping) for Avalon-ST Video
When a 6G-SDI packet is carried over the 12G link, half of the 80-bit data bus will be unused. The SDI Resampler within the CVI II IP core discards the null pixels, splits the pixel components, and accumulates successive components to recombine the original image format into Avalon-ST format.
Note: The SDI Resampler is only enabled when you turn on the Support 6G and 12G-SDI parameter with the pixels in parallel fixed to 4 in the CVI II or CVO II Intel FPGA IP parameter editor.
Figure 36. Clocked Video Capture of 6G-SDI Mapping Transported Over 12G-SDI Link and Required Remapping

When a 3G-SDI packet is carried over a 12G-SDI link, the CVI II IP core captures 3 null pixels for every active pixel. The SDI Resampler discards these null pixels to reestablish the 3G-SDI sample order in the Avalon-ST video frame, as shown in the figure below.

Figure 37. Clocked Video Capture of 3G-SDI Mapping Transported Over 12G-SDI Link
Table 15.  SDI Resampler with CVI II IP ParametersThe table shows the differences in the CVI II IP core with the presence of the SDI Resampler.
Parameters Support 6G and 12G-SDI Off Support 6G and 12G-SDI On
SDI Resampler Not available Present
Pixels in parallel 1 4
Standard width range 1–16 3
Multi-rate Mode 3G-SDI, HD-SDI, SD-SDI 12G-SDI, 6G-SDI, 3G-SDI, HD-SDI, SD-SDI
Square Division Quad format Not supported Not supported
2 Sample-interleave (2SI) format Not supported Supported
12G-SDI with 8 streams interleaved Not supported Supported
12G-SDI with 16 streams interleaved Not supported Not supported
6G-SDI with 4 streams interleaved Not supported Not supported
6G-SDI with 8 streams interleaved Not supported Supported
3G-SDI Level A Supported Supported
3G-SDI Level B Not supported Not supported
HD-SDI Supported Supported
SD-SDI Supported Supported
4:4:4 Not supported Not supported
4:2:2 Supported Supported
4:2:0 Not supported Not supported
Minimum active frame size 32x32
  • 3G-SDI, HD-SDI, SD-SD: 32x32
  • 12G-SDI, 6G-SDI: 32x64
Active width supported Modulo 1
  • 12G-SDI, 6G-SDI, 3G-SDI, HD-SDI: Modulo 4
  • SD-SD: Modulo 8
Active height supported Modulo 1 Modulo 1
Clipping Supported Not supported
Padding Supported Not supported