Teletext clock speed: how to send bits in 6.9375MHz speed?

[hasaranga]

How rpi sends teletext data in 6.9375MHz speed (fractional)?

[ali1234]

With DISPMANX hardware scaler.

[hasaranga]

I'm trying to generate a teletext signal from fpga. The issue is generating data at 6.9375MHz speed. Is it essential to have exact data rate or can I use a rate like 7MHz?

[ali1234]

You must have exact data rate.

[ZXByteman]

Data rate is H-sync multiply by 444. So if you have H-sync = 15625 Hz in your design, you may produce exact bit clock too.

[hasaranga]

Thanks for the idea. I will try that with a PLL.