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Altera_Forum
Honored Contributor I
909 Views

Help: Writing into CVO registers

My system consists of only TPG , CVO and SD-SDI output. 

 

TPG (720x480)>> CVO >> SD SDI output 

 

Using Neo, I can read/write the TPG correctly, but each time 

when I try to write into the VCO the software hung.  

 

Does this mean I have to do something on TPG (i.e stop) or put into certain operating mode before I can write into any of the VCO registers ? My goal is I want to be able to change VCO parameters at runtime and view the changes of video image on SDI monitor. 

 

Thanks in advance.
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3 Replies
Altera_Forum
Honored Contributor I
44 Views

You should be able to read/write the CVO registers at any time without hanging the system. The only thing I can think of is that maybe you selected the a wrong/bad clock in SOPC builder for the CVO.

Altera_Forum
Honored Contributor I
44 Views

Thanks, Kevin. I will check. 

Since I can read/write the TPG fine, I would think my clock (27MHZ) should be fine.  

 

Question for you though: At the moment I am only interested in using MODE1 of the CVO, the following two parameters were what I set on the megawizard that I am not very certain about ! 

 

Runtime configurable video modes = 1 

Width of "vid_std" bus = 1 

 

Are these setting correct? 

 

Again thank you for your help, 

 

 

JIMMY
CSoil
Beginner
44 Views

Hi Jimmy, did you ever figure out your issue? I am having issues with the CVO not getting the mode matched.

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