Forum Discussion
Altera_Forum
Honored Contributor
Honored ContributorVGA 25MHz, Clock 100MHz, Help!
Hi, I would like to use a 100MHz clock to drive my logic, but the problem is that VGA needs a clock of 25MHz. Right now, I am using 2 PLLs to create a 100MHz clock and 25MHz clock by us...
Altera_ForumHonored Contributor
Honored Contributora VGA controller is realy a pretty simple statemachine, just some counters and a bit combinatorial logic thats it.
you need a counter for x and one for y based on these values you generate the blanking signals i could give you an example for 640x480 und you just need to add 2 bit counter to slow down the pixel rate from 100 : 25 = 4 : 1. vga runs at 25 very well if you just add your own vga controller and let it run at 100MHz you wont need to worry about the clock crossing stuff
