Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

confusion about scaler

hi,

I have a problem with scaler, my data path is :

CVI(clocked video input)->SCL(scaler)->FRM(frame buffer)->CVO(clocked video output)

It takes the input resolution 800x600 and scaled to 1920x1080 and output , when the input is 800x600, it worked well.

But when I changed the input resolution from 800x600 to 640x480, the whole screen flickered badly.

So I think the input resolution of scaler is fixed, am I right?

Thanks for reply!

4 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    15 years ago

    Hi,

    If you use the Scaler as is (without controlling it via the run-time control) then the input is fixed per the configuration in the SOPC.

    If you use the run-time control then the input resolution is the maximum resolution you can input.

    BR,

    Reuven
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    15 years ago

    --- Quote Start ---

    Hi,

    If you use the Scaler as is (without controlling it via the run-time control) then the input is fixed per the configuration in the SOPC.

    If you use the run-time control then the input resolution is the maximum resolution you can input.

    BR,

    Reuven

    --- Quote End ---

    hi, ra2m, thanks for reply.

    do you mean if I use the run-time control of scaler which means I can input other resolution equal to or less than the maximum resolution I set in sopc?

    But it seems that there is no register of scaler for me to explictly change the scaler to adapt to the input resolution at run time.
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    15 years ago

    Yes, when the run-time control is used the input resolution in the SOPC setting is the maximum resolution. Any resolution below the set input resolution it will be scaled.

    But if the run-time control is not used the input resolution in the SOPC is the only resolution that can be used in the input.

    BR,

    Reuven