I'm trying to determine what is the correct timing for 640x480 VGA. Using Tinyvga.com for 640x480@60Hz I get a pixel frequency of 25.2 Mhz and not 25.175 Mhz.
800*525*60 = 25200000
I have wrote assembly for a AVR outputing Hsync and Vsync and my logic analyzer shows the freq per frame is 60.06hz which is correct for a oscillator of 25.175Mhz.
If I use a 25.2Mhz oscillator the freq per frame is 59.94hz.
Which is right?