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Altera_Forum's avatar
Altera_Forum
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15 years ago

TG > VCO > SDI IP block issue

I have a simple test design that consist of only three IP blocks. Using Quartus 9.1, and here is the problem I can't figure out what causing it.

test1:

TG (720x486, 10bit sequence, interlace) >> VCO (preset to ntsc) >> SD SDI = No picture on the sdi monitor !!

test2:

TG (1920x1080, 10bit pararell, interlace ) >> VCO (preset to sdi 1080i60) >> HD SDI = Good picture !!

Could somebody in the forum tell me what I did wrong on the TEST1 above? or may be there is bug on the TG for SD SDI?

In fact, on the Test1 above, I have tried to set the TG resolution to 720x480 as well but no luck.

Thanks in advance,

Jimmy

2 Replies

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

    Test1 does not work because the CVO is expecting F0=244 lines and F1=243 lines in this case. The Test Pattern Generator cannot produce this sequence. You can work around this issue as follows:

    TG (720x487, 10bit sequence, PROGRESSIVE) >> Interlacer >> VCO (preset to ntsc)