Video and Image Processing Suite User Guide

ID 683416
Date 4/04/2022
Public
Document Table of Contents

3.1.3. Separate Synchronization Format

The separate synchronization format uses separate signals to indicate the blanking, sync, and field information.

The CVO IP cores create horizontal and vertical syncs and field information through their own signals. The CVO IP cores create a sample for each clock cycle on the vid_data bus. The vid_datavalid signal indicates when the vid_data video output is in an active picture period of the frame.

Table 11.  Clocked Video Input and Output Signals for Separate Synchronization Format Video
Signal Name Description
vid_h_sync When 1, the video is in a horizontal synchronization period.
vid_v_sync When 1, the video is in a vertical synchronization period.
vid_f When 1, the video is interlaced and in field 1. When 0, the video is either progressive or interlaced and in field 0.
vid_h When 1, the video is in a horizontal blanking period, (only for Clocked Video Output IP core).
vid_v When 1, the video is in a vertical blanking period, (only for Clocked Video Output IP core).
vid_de When asserted, the video is in an active picture period (not horizontal or vertical blanking). This signal must be driven for correct operation of the IP cores.
Note: Only for Clocked Video Input IP cores.
vid_datavalid
  • Clocked Video Output IP cores: When asserted, the video is in an active picture period (not horizontal or vertical blanking)
  • Clocked Video Input IP cores: Tie this signal high if you are not oversampling your input video.
Figure 16. Separate Synchronization Signals Timing Diagram

The CVI IP cores only read the vid_data, vid_de, vid_h_sync, vid_v_sync, and vid_f signals when vid_datavalid is 1. This allows the CVI IP cores to support oversampling where the video clock is running at a higher rate than the pixel clock.