Here are some more links for VGA signal and programmable logic:

1) http://www.xess.com/appnotes/vga.pdf
2) http://www.eecg.utoronto.ca/~singhd/241/vgacon.htm
3) http://www.geocities.com/ipm_grp/S...r_SVGA.htm

And some more from the well known epanorama.net site concernig Video/VGA signal in general (as well as circuits and ICs):

1) http://www.epanorama.net/links/video.html
2) http://www.epanorama.net/links/pc_video.html
3) http://www.epanorama.net/links/videochips.html
4) http://www.epanorama.net/links/videocircuits.html

George