I'm not sure if this is totally relevent - but when I was looking at the
video transmission details a week or so ago, the sync timing is defined on
the falling edge of the pulse.
I would have thought that most systems would control the pulse widths to
better than 1uS - but this may not be the case.
Richard P





Hi,

Anyone familiar with the Elantec/Intersil LM1881 Sync Separator?

I am trying to use the rising edge of Vertical Sync pulse to trigger a pic
intrpt. I have found that the rising edge has unstable timing, with a
variation of up to 1us. The falling edge of the pulse appears to be
perfectly stable. I have tried various combinations of Rset with no
apparent effect on the stability.

Has anyone experienced this? Anyone know if it can be corrected? Or will
just have to change my code to use the falling edge (would perfer to aviod
this if possible).

Thank you
Regards,
Daniel Sweet

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