Hi Miernik and all, At 15:35 31/01/2003 +0100, Miernik wrote: > >No, Skymedia is a totally different chipset. > >I have a Skymedia 200D and it has two big chips: > >160-pin square SMD: >AV >AURAVISION >VXP195 CPQ >TAN8698.1AT9902
The VXP195 seems to be a PCI bridge (as the PLX PCI9054, or the SAA7146); the corporate site <http://www.auravision.com> is not accesible. The relative location of this IC (close to the PCI bus, or the tunner, or near the CI connector [if there is one], etc) could add some light about its use. IOW, some good pictures are need :-). >208-pin square SMD: >ST20TP4CX50S >EC1-J852FFA >A22BV9918 >MALTA >ST The ST20TP2 is a ST Microsystems microprocessor, which have a TS demultiplexer and CSA descrambler, commonly used on (old) Set Top Boxes; currently, the STi55xx family is used, as it integrates also the MPEG2 Video and Audio decoders and the (analog) Video encoder. I don't know of any public datasheet for the ST20TP4 :-( ; but very close to it and until not long ago, _was_ possible to find find the datasheet for the ST20TP2 and the info for the CPU core, on the ST web site :-( : PROGRAMMABLE TRANSPORT IC FOR DVB APPLICATIONS http://us.st.com/stonline/books/pdf/docs/4556.pdf ST20 C1 INSTRUCTION SET MANUAL http://us.st.com/stonline/books/pdf/docs/5221.pdf Of course, if anyone have a usefull datasheet for the ST20TP4, I'am interested on a copy :-). AFAIK, the ST20TP4 add a DCU (Diagnostic Controller Unit), which enable the full debugging of the system by the JTAG port; the ST20TP2 also have a JTAG port, but it's near useless, as the Boundary Scan function don't work and the DCU is missing. The little info that I know about the DCU can be found on a few pages of the ST20TP6 datasheet. Other "source of info" for the DCU are the JTAG programs (from Tomas Vlad and others), used for STB "hacking" :-), which are availables on the net. >P.S. The card is broken "from the radio side", I mean the divers load > with it OK, but all the time I see "no signal lock". So I can do > some "irreversably intrusive hardware reverse-engineering" on > this card if someone has any idea. The "intervention" don't need to be "irreversible" :-). I'm not have saw any picture of this card, but surelly it have the pads for a JTAG port, as also have the TT_DVB cards for the AV7111x ARM7 core, with the difference that the JTAG on the ST_DCU is much more "documented" with useful programs and trivial JTAG interfaces. Best regards: -- Roberto Deza Asensio Universidad de Navarra Data Procesing Center [EMAIL PROTECTED] -- Info: To unsubscribe send a mail to [EMAIL PROTECTED] with "unsubscribe linux-dvb" as subject.
