[linux-dvb] Re: Nexus-CA/stv0297 problems

[Andrew de Quincey <adq_dvb@lidskialf.net>]

On Friday 19 Nov 2004 02:14, Robert Schlabbach wrote:
> From: "Andrew de Quincey" <adq_dvb@lidskialf.net>
>
> > Hi, I'm trying to get this Nexus-CA card with an stv0297 demod going.
> > As far I can see I'm programming the tuner and the demod correctly...
> > however the demod never locks - its like it never gets any data from
> > the tuner.
>
> The STV0297 is not directly wired to the tuner - there is a TDA9819
> DVB/analog IF AGC amplifier in between. That chip needs to be switched
> between analog and DVB mode.
>
> On the old Fujitsu/Siemens DVB-C card, the corresponding TDA9819 control
> pin was wired to a "TEST" output pin of the VES1820 demodulator, i.e. you
> switched between analog and DVB by writing to the VES1820 TEST register.
>
> You'll have to find out how the TDA9819 is controlled on this new board.
> Does the STV0297 possibly have some GPIO ports? If it does, TT may have
> used that. Or maybe they used one of the SAA7146A GPIO pins this time?

Aaaaah thanks, that makes sense with what I'm seeing. As for how to switch it, 
no ideas yet - I don't think there are any GPIOs on the demod itself.