We used ADV7180 capture CVBS video signal through the FPGA to ADV7391 output to monitor, which the video screen have flicker problem.This problem is very urgent, please to help to solve as soon as possible.Thank you!
The test environment is such: DVD output CVBS video signal to the ADV7180 capture and then output to the FPGA, in the FPGA did not do anything with control signals and video data signals output and directly output to ADV7391 (including 7180 output of 27M clock signal, SFL signals, 8 bit data signals), when at the same time enable SFL in 7180 and 7391, 7391 of the output video images are flashing; Disable SFL in ADV7180 or ADV7391, the output of the ADV7391 video images do not flash, is normal; When set 7180 work in the free run mode and
output blue screen , and enable SFL in 7180 and 7391, 7391 of the output video picture is normal, no flicker.
Additional, Video output from DVD direct connect to the monitor and the picture is not flashing, so we can determine the video source is normal.In addition, the peripheral circuit of 7180 and 7391 are reference to the device manual.
ADV7180 register configuration:
ADV7391 register configuration: