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Altera_Forum
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16 years ago

CVO and PAL - How?

Hi all, I am trying to generate a PAL video output using the VIP suite. At the moment my device (A cyclone 2c35) only has the test pattern generator and the clocked video output. I...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

The CEA861 specs for digital video for 720x576i are as follows:

H Sync - 63

Front Porch - 12

Back Porch - 69

Field 1:

V Sync - 3

Front Porch - 2

Back Porch - 19

Field 2:

V Sync - 3

Front Porch - 2.5

Back Porch - 19.5

This gives a total frame size of:

(12 + 63 + 69 + 720) x (2 + 3 + 19 + 288 + 2.5 + 3 + 19.5 + 288) = 864 x 625

I am not sure how that translates to analog video timings. I am also not sure how the VIP CVO block handles the half line or if it even can. You can't seem to enter half lines into the wizard. The half lines in interlaced video always confuse me a bit. So far I have never tried to use the CVO with interlaced video.