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Use TFP401AMPZPEP transe HDMI to Parallel RGB,HSYNC/VSYNC Setting

Other Parts Discussed in Thread: TFP401A

I  connected  a LCD display with parallel RGB, to HDMI. Schematic diagram see attachment. 

It is found that the HSYNC and VSYNC time series parameters we set on TFP401AMPZPEP are different from the actual output.

the LCD Display effect see attachment.

4_(HDMI转RGB)原理图.pdf

  • Hello,
    Are you transmitting audio during blanking periods?
    The tFP401A requires an even number of clock during blanking.
    Regards
  • Hello, thanks for your answers.
    I don't transmitting audio during blanking periods. My question is that : why the HSYNC and VSYNC timing that the TFP401AMPZPEP actual output are different from the parameters we set on TFP401AMPZPEP. For example, the parameters we set on TFP401AMPZPEP is as follows. then, there is no HSYNC signal output from the TFP401AMPZPEP .why?
    //Please setting timing here:
    //-------------------------- Hs
    //Hs Low:
    HsLwidth<=11'd1; //48
    //Hs Hign:
    HsHwidth<=11'd251; //HsHwidth=HsBPorch+HsAPixel+HsFPorch
    //Hs Backporch & AA & Frontporch
    HsBPorch<=11'd1; HsAPixel<=11'd240; HsFPorch<=11'd10; //39.168
    //-------------------------- Vs
    //Vs Low:
    VsLwidth<=11'd1; //4
    //Vs Hign:
    VsHwidth<=11'd328; //VsHwidth=VsBPorch+VsALine+VsFPorch
    //Vs Backporch & AA & Frontporch
    VsBPorch<=11'd0; VsALine<=11'd320; VsFPorch<=11'd8; //29.6
  • Are you sending an even number of clocks during DE high and during DE low?
    Regards