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

["Robert Schlabbach" <robert_s@gmx.net>]

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.

Regards,
--
Robert Schlabbach
e-mail: robert_s@gmx.net
Berlin, Germany



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