[linux-dvb] Re: budget-ci CI interface testing

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

On Sunday 18 April 2004 00:33, Kenneth Aafløy wrote:
> On Sunday 18 April 2004 01:03, Robert Schlabbach wrote:
> > From: "Kenneth Aafløy" <ke-aa@frisurf.no>
> >
> > > Throughout all this fuzz about budget-ci, I have kept scratching my
> > > head trying to figure out if this new code (with little or some
> > > modification) could fit the KNC1/Typhoon/Terratec (budget-av) class
> > > of cards also?
> > >
> > > What kind of chips are you actually communicating with through the
> > > saa7146?
> >
> > The TT budget CI is as cheap as it gets: The transport stream is routed
> > through a few latches (controlled via GPIO1) from the demodulator through
> > the CI to SAA7146A port D1_A (normal operation is through D1_B, where the
> > demodulator outputs are connected in parallel).
> >
> > The CI control interface is implemented via the DEBI, with a GAL/PLD
> > translating the DEBI protocol to the CI protocol. Comparing the
> > protocols, a simple 1:1 translation of some signals should work for e.g.
> > CI I/O port accesses, if you accept some minor timing specification
> > violations (which may just be what breaks some CAMs :-()...
> >
> > So the TT budget CI consists of only a few latches and a GAL/PLD, that's
> > it. No real "chip" in there.
>
> Thanks a lot for a great answer Robert. After lingering around a bit in the
> saa7146 specs I figured how the picture was to look like. I also noticed
> that the KNC1 have the AV interface control hooked up to gpio0, so that
> probably tells us that the KNC1 and clones is pretty much similar to the TT
> budget card. Which makes me want to move the AV extension from the KNC1
> card into the budget-ci driver, and add the pciid for KNC1 and clones to
> it. Remove the budget-av driver, and rename the budget-ci to budget. Sound
> sane coming from a newbie? :)
>
> I don't have the CI interface for my Typhoon card, but I'm seriously
> considering ordering one after this answer, which makes me quite
> confident that making it work with the code Andrew is working on will be
> fairly trivial.

Is that like the CI interface on a full featured TT card? I _think_ those have 
a CiMAX chip on 'em. If it is there are docs on it here. 
http://www.atmel.com/dyn/products/product_card.asp?part_id=2356

(The Atmel T90FJR seems to be derived from the CiMAX)


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