I've built a generic CVBS to HDMI converter with ADV7280 and ADV7511. What would be a good default register set for both devices?
I beleive this CVBS to HDMI conversion is possible with ADV7280 and ADV7511.
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It seems that ADV7511 requires DDR clock or 2x clock when working in 8-bit input mode.
Is it possible to make the ADV7280 work with the ADV7511 given these constraint?
The ADV7280 will output YCbCr 422 over an 8-bit bus. Yes, the 7280 output clock will be double the pixel rate to accommodate this but the ADV7511 can work just fine with this. We already have lots of scripts for the ADV7511 for this format.
Understood. I came across yet another potential issue: How about the fact that the 7280 LLC output clock is not stable but it varies with the analog input line(?) length.. Will the ADV7511 accept an unstable input pixel clock, thus producing unstable HDMI output clock?
The ADV7511 needs a stable clock to generator the tmds clock. What is your source? Why is the line length variable?
For ADV7511 Video Clock (pin 79) input I have used LLC output from ADV7280. Here it's said that the LLC clock can vary by 5% ADV7280 frame timing on the digital output video bus .
Thus it seems ADV7280 + ADV7511 is not a working combination?
First of all the ADV7280 is not recommended for new designs. A replacement would be the ADV7842 or ADV7850. These devices use external frame buffers to stabilize the clock rates.
Second the ADV7280 was designed to handle tracking problems with VCRs. Current video sources do not have these problems.
The ADV7511 will track the input clock as long as its deltaF/deltaT is not too great.
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