Forum Discussion

AAlas3's avatar
AAlas3
Icon for Occasional Contributor rankOccasional Contributor
6 years ago

NIOS II pixel buffers shows strange dots on VGA screen

Hey,

I am using DE2-115, my problem is when I use Pixel buffer to draw anything on the screen it works but it also draws small strange dots with different colors, I tried to clear the buffers but they still appear.

Thanks in advance

4 Replies

  • Ahmed_H_Intel1's avatar
    Ahmed_H_Intel1
    Icon for Frequent Contributor rankFrequent Contributor
    6 years ago

    Hi,

    Did you assign a default slave IP to clear all the invalid transactions?

    Are you using a DMA to stream on this screen?

    Regards

  • AAlas3's avatar
    AAlas3
    Icon for Occasional Contributor rankOccasional Contributor
    6 years ago

    Yes clearly the pixel buffer is with DMA, what do you mean by slave IP ?

  • Ahmed_H_Intel1's avatar
    Ahmed_H_Intel1
    Icon for Frequent Contributor rankFrequent Contributor
    6 years ago

    The slave IP is an option to assign an IP as a slave IP in Qsys. This helps to clear any invalid transactions that might cause a glitch in the system.

    You can simply add a PIO IP into your Qsys design and then assign this IP as a default slave as shown in the image below.