Forum Discussion

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

trouble making a custom vip usign data_valid signal

Hi all.

I am trying to make a custom image processing block, it should be a kind of median filter.

The problem is that between the input and the output of my median filter there is a latency of 6 clock. I was thinking of use data_valid as "clock" for my median block, so elaboration is performed only when there aree active pixel.

But when the last pixel of the frame enters the block,data valid is deasserted - or it becomes the data valid of config packets.

If I try to make longer processing, the latency incresaes, so i cant't perform an elaboration onto a complete frame.

Someone has any hint, please?

Best regards

Phate.

2 Replies

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

    Keep the data valid, but instead of using it as a clock enable, just use it as a data valid (maybe used at the other end as a write enable. Then have a "complete" signal when all processing is complete that disables the clock enable.

    Or just keep the block processing invalid data untill the next frame arrives.
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    15 years ago

    thanks a lot for your reply.

    I was thinking somethng like that, this weekend I'll try and I'll let you know if I had been able to resolve that problem!

    best regards

    Phate.