Honored Contributor
Honored ContributorI managed to get a pixel perfect genlock. The main problem was that my pixel clock wasn't a NTSC clock multiple. I'm running now at 114.54Mhz. I also changed the RAM access using altram 2 port and implemented a SDRAM module to capture the full frame. It's working well as you can see in the video:
https://www.youtube.com/watch?v=p8typuh1hqq But I'm getting noise, specially with some colors red or cyan. I'm grounding the computer, the altera and the VGA output together. Is there anything else I can do ? I tried to space the input pins away across the GPIO_0 banks to avoid cross talk but still the problem remains (maybe less noisy now). I also tried to use LVDS inputs to implement fast 2-bit ADC but what I get is even more noise. I was using a resistor ladder for different voltage levels: 1.65, 1.0, 0.4 but LVDS inputs seemed to oscillate. When I outputted the LVDS inputs to the LEDs and I could see the LEDs with a dim light where it was supposed to be off due to the applied voltage.
