[linux-dvb] STB6100, STB0899 programming information?

Manu Abraham abraham.manu at gmail.com
Wed Aug 30 15:01:59 CEST 2006

thomas schorpp wrote:
> Robert Schlabbach wrote:
>> From: "Manu Abraham" <abraham.manu at gmail.com>
>>> Shortage of chips ? More than that, the Twinhan DVB-S2 card,
>>> VP-1040 uses the Mantis PCI bridge, which is a new chipset as well.
>> Not new to me ;)
> is Mantis a trademark or a manufacturer?
> i want one but twinhan doesnt talk to me.

Mantis is the name of a chip. It looks like a trademark. Mantis II and
Mantis III are expected later. Never try to jump too fast into something
that is too brand new (with any vendor, any product). Will get you into
a lot of frustrations.

It will come out soon.

>>> You can look at the STB0899 driver over here.
>>> http://thadathil.net:8000/cgi-bin/hgwebdir.cgi/mp-stb0899
>> Thank you very much! Now I have something work with :)))
> a *huge* thing, eheh
>>> ST has been quite kind to provide help to put this driver together.
>>> They did provide information that which was missing from the datasheets
>>> as well, as they wanted to go for a very good driver.
> thats real nice, my excuses for bothering them.

ST wanted a business case to provide help. Twinhan promised them volumes
over the next 5 years and asked them to provide help on the same due to
the new delivery system.

>> How well is your driver working in its current state? I have quite some
>> issues with the TT DVB-S2 card using the Windows driver and software,
>> such
>> as sometimes it being completely unable to tune to most transponders -
>> and
>> I don't even know if this is only a driver bug or in fact a defective
>> piece
>> of hardware I got here... :(

As i heard, someone told me that DVB-S2 needs a better SNR like QAM256
etc. No hands on experience there, just a word of mouth from somebody.

> old noisy lnb, switchbox, cables? maybe some transponders need this new
> circular polarisation too, i think older lnb's cant detect it.
> and 8/BPSK should be as noise sensitive like 256qam on dvb-c.

Yep, sounds similar to what i heard.

>>> It requires some additional loops like checking for the Pilot symbols
>>> (BC mode) etc Carrier Synchronization, Checking for Unique Words etc.
>>> Hence it looks a bit complex.
>> Glah... :(
> little disappointing, modern devices should be fully automatic and be
> capable of blind signal aquisition. too much software-overhead here. st
> got homework.

It is not the device needs more work or anything else, but it is the
delivery system in fact. Any demod which tries to hide this will have to
hide it in some form of a binary blob, ie, firmware. since it is part of
the delivery system specification. I would always prefer, open source
than a binary blob.


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