Well, it's been a long time coming. I started this project in February 2017 and have finally had a successful text, palette, and color bar test. Life got in the way and slowed down my progress, but progress has been made!
There is a little bit of pixel jitter on the output, which I'm pretty sure is due to the fact that the FPGA is running asynchronous with the AD723. The FPGA outputs pixels at 12.5 MHz and the AD723 is running at 14.31818 MHz. I can fix this in the future with a board revision and some clock domain management, but it's not important right now.
With the video test complete, I now need to work on a comprehensive SRAM test and output the results to the television. I've already ran a basic error check on the SRAM and output the results via serial, but I want to display everything on the television. Coming soon!