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Date: Wed, 28 Nov 2012 21:05:19 -0500
From: Matthew Gyurgyik <matthew@pyther.net>
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To: Antti Palosaari <crope@iki.fi>
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Subject: Re: em28xx: msi Digivox ATSC board id [0db0:8810]
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On 11/28/2012 05:55 PM, Antti Palosaari wrote:
>
> Very, very, good pics and sniffs!!
>
>
> From the sniff you could see I2C addresses
> 50 (a0 >> 1) eeprom
> 0e (1c >> 1) demod
> 60 (c0 >> 1) tuner
>
>
> EM2874, USB-bridge, clocked at 12MHz, crystal on other side of PCB. 
> There is also 32k serial eeprom for EM2874. This large serial eeprom 
> means (very likely) it uses custom firmware which is downloaded from 
> the eeprom.
>
> LGDT3305, demodulator, clocked at 25MHz. Serial TS used between EM2874 
> and LGDT3305.
>
> TDA18271HDC2 is tuner, clocked at 16MHz. Traditional IF used between 
> tuner and demod.
>
> IR receiver is near antenna, which is a little bit long wires to 
> connect to the EM2874, looks weird but no harm.
>
>
> Main GPIO sequence is that one:
> 000255: 000006 ms 000990 ms c0 00 00 00 80 00 01 00 <<< ff
> 000256: 000004 ms 000994 ms 40 00 00 00 80 00 01 00 >>> fe
> 000257: 000006 ms 001000 ms c0 00 00 00 80 00 01 00 <<< fe
> 000258: 000004 ms 001004 ms 40 00 00 00 80 00 01 00 >>> be
> 000259: 000139 ms 001143 ms c0 00 00 00 80 00 01 00 <<< be
> 000260: 000005 ms 001148 ms 40 00 00 00 80 00 01 00 >>> fe
>
> There is some more GPIOs later, just test with trial and error to find 
> out all GPIOs.
>
> Making that device working should be quite easy! There is a little 
> change for proprietary firmware for EM2874 which does some nasty 
> things, but that is very very unlikely.
>
> regards
> Antti

Thanks for the information. That is way over my head. Is there same 
basic reading someone could recommend so I can start to understand the 
basics of all this?

In the mean time, I'm willing to do any testing necessary.