[linux-dvb] Possible patch for CAM/CI issues

Andrew de Quincey adq_dvb at lidskialf.net
Mon Nov 7 19:34:54 CET 2005

On Monday 07 Nov 2005 18:31, Marco Coli wrote:
> Georg Acher wrote:
> > The signal integrity of some CAMs is quite bad. The have slow and and
> > irregular rise and fall times for the clock, with varying setup/hold
> > times for the data. This can lead to data corruption on the receiving
> > side of the CI slot. AFAIK the Matrix cam was one of the worst I've seen.
> > I can't imagine how one create such an "analog" clock signal from a
> > digital source...
> I am sorry to hear that... Unfortunately for me, I can't consider a cam
> change, because Matrix and Dragon, as far as I know, are the only ones
> which can be programmed for NDS-Videoguard for sky italy.
> > In short: There is so much badly designed crap in the CAM market. It is
> > a wonder that at least some CAM/receiver combinations work...
> But in all receiver I tried, my cam worked well, except for my nova card
> :-(
> Do yiu think, like Andrew suggested, that using a full featured card
> (like the nexus-S one) could be a solution?

I wonder if it would be possible to simple have some form of retransmission at 
the application level... I'll have a look at en50221.

I reckon we need debug from the application side to find out exactly what is 
going on.

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