DE2 TV Decoder

Same flickering problem also applies to me.

I have more than 5 DE2 boards.

With a same video input, and a video output(to LCD monitor), I just replaced the target DE2 board with another one.

For the DE2_Video_In example in UPDS, just one DE2 board showed good video output with no flicker.

But, the rest always showed flickering problem with different level of flickering.

Also for the good DE2 board, if I execute some light software with the derivatives of Video_In, flickering appears.

In debug mode with the derivative of the DE2_Video_In, the pixel memory written by the UP Video DMA controller sometimes showed incorrect data (all zeros, or just small section of pixel buffer is written for continuous addressing mode).

The Video_In_Decoder(altera_up_avalon_video_decoder.v) verilog design in UPDS does not use the HSync(TD_HS) and VSync(TD_VS) inputs, but only TD_DATA and TD_CLK27 to .

I suspect that the reason that the flickering problem depends on a DE2 board is due to the different synchronization per board.

Is there any one to solve this flickering problem? Your experience would be very helpful to me.