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DE2-115 D5M image issues

Altera_Forum
Honored Contributor II
834 Views

Howdy, 

 

I am an absolute FPGA beginner... but for a beginner I have a very nice collection of Altera products:) 

 

I am running Quartus Web Edition v14 with DE2-115. 

 

The updated example from the CD that comes with the D5M compiles and runs fine.  

 

The default resolution provides a nice clean VGA image, with minor color balance problems. 

However, when I change the resolution to 640x480 by uncommenting the setting in VGA_Param.h, 

the resulting image has vertical bars of noise. 

 

Another thread with a different but somewhat similar issue resolved that issue by making clock changes to the .sdc file. 

I have played with various changes to D5M_PIXCLK in the .sdc file... from 20 to 48, with no visible changes in the output. 

 

Thanks, 

 

Rich
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1 Reply
Altera_Forum
Honored Contributor II
90 Views

Oops... the SDRAM clock was set for 100MHz for simulation purposes. By commenting out the 100MHz settings and uncommenting the 133MHz settings, the problem went away.

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