vesa tolerances

[filippo]

I'm wondering if it's available (free or paying for it) a full
electrical specification of VESA standards with tolerances, es

vga is 640x480@60hz:
hsync= 31,46KHz
bsync = 60Hz
what is the tolerance on HSINC and VSYNC?

is that standardized?

Thanks,
Fil

 

[Jasen Betts]

I'm wondering if it's available (free or paying for it) a full
electrical specification of VESA standards with tolerances, es

vga is 640x480@60hz:
hsync= 31,46KHz
bsync = 60Hz
what is the tolerance on HSINC and VSYNC?

is that standardized?

probably.

In my experiance with old fixed or multi-sync displays 0.5Khz horizontal and 2hz vertical can
make a difference. modern displays with microcontrollers and OSD are much more lenient.

Computer video cards derive the sync rate from ordinary quarts crystal
clocks, if you do the same you should be fine.

Bye.
Jasen