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Sniffing the Rigol's internal I2C bus

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Co6aka:

--- Quote from: Abdu on December 01, 2013, 08:07:05 am ---DS4014 frequency response based on Co6aka measurements...
--- End quote ---

Interesting how the knee is right at 500MHz, and the highest BW DS4K is 500MHz.

I forgot to add: I also generated some 95% modulated AM signals at 1GHz which, though attenuated, looked exactly as expected; seems the scope is still usable at 1GHz. When I get an opportunity I'll do some more upper-frequency-limit exploration, and if anyone wants me to also try some specific tests send me a PM with the details.

andyturk:

--- Quote from: Co6aka on December 01, 2013, 09:21:10 pm ---... I also generated some 95% modulated AM signals at 1GHz which, though attenuated, looked exactly as expected; seems the scope is still usable at 1GHz.

--- End quote ---
That's the same conclusion that Connor Wolf came to a while back. The info is buried in the thread somewhere, but the input amplifiers are configurable for bandwidth and are spec'd to handle 900MHz, if I remember correctly. It could be that cybernet's DS4K mod simply tricks the scope into thinking it's a 500MHz model, without touching the actual configuration of the input amps. I.e., the DS4054 may still be limiting the bandwidth under software control.

The way to find out would probably be to put a logic analyzer on the SPI lines for those input amps and see what's being sent to them. ve7xen tried that on his DS2K, and found that the input amps were still limited even when the scope's UI said otherwise.

cybernet:
im pretty sure the change int he model type id (thats what the firmware file hack does) affects the SPI based filter chip, indirectly.
but: atm i believe the FPGA or a micro core in the FPGA is actually running the SPI bus, the bfin is a slave - so the actual value that gets set in the SPI based filter chip is unknown to me (but it does upgrade, that im pretty certain)

Carrington:
Another question: What chip sets the DS4000's BW?

thetooth:
At the risk of sounding retarded, is the DS2000A hackable at this point?, i've skimmed backwards through to page 60 where people were talking about it but there wasn't any solution.

My DS2072A arrived today and i've been burning through the trail like anything(2000 minutes is NOTHING), since i really need the 56mp/s option but am flat broke after buying the scope. Of course tried the keygen to no avail using manual input and serial.

I'm willing to do FW dump if its needed, also i have a copy of the latest GEL file.

And somewhat off topic, dose the DS2000 normally crash frequently? i've had it on for probably 4hrs total, and its crashed 5 times so far, 3 when using the decode functions and the others just randomly.

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