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Sniffing the Rigol's internal I2C bus

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marmad:

--- Quote from: AndersAnd on December 10, 2013, 05:30:30 pm ---This has already been mentioned a couple of times recently in this topic:

--- End quote ---

Yes, this thread has turned into a beast which is constantly eating it's own tail ;^)

Perhaps an image will put the question to bed:

alank2:
Any idea why they dropped the 200M bandwidth limit?

JDubU:

--- Quote from: marmad on December 10, 2013, 03:46:41 pm ---To sum up:

There is no distinction between 'non-A' and 'A' firmware - Rigol has intended for the latest version to work on all models. So feel free to upgrade and downgrade at will - but, because of changes to FRAM, it's best to do it only with the bootloader - and after switching between the major versions (v.1 to v.2 - or - v.2 to v.1), it's best to hold in the left-menu F6 button on the first boot after loading - or the DSO can hang when switching between various menu items.

The new v.2 FW (unlike older versions) was written to work completely correctly with a 300MHz bandwidth (which is why the 1ns/div TB works fine), so you can be assured that if it's activated, it's working correctly - unless there is something the FW does with the LMH6518 chip specifically to inhibit it on non-A models.

The v.2 FW does NOT have a 200MHz bandwidth limit switch for the channels (as evidenced by the DS2000A User Manual) - so it's correct that the option does not appear in the menus.

As AndersAnd mentioned, there has yet to be a key found for the A-model - and as far as I know, no A-model owner has attempted to just downgrade to a v.1 firmware, run the keygen, and then upgrade back to v.2 (not sure why).

--- End quote ---

Here is something a bit odd.
I just upgraded the firmware on my DS2072 from 00.01.01.00.02 (was preinstalled on delivery) to 00.02.01.00.03 using the methods recommended by Marmad.

Extended system info:

Before:
Model: DS2072
SW: 00.01.01.00.02
HW: 1.0.2.0.0
FPGA version:
                   SPU  03.01.05
                   WPU  00.06.05
                   CCU  12.29.00
                   MCU  00.05

After:
Model: DS2072
SW: 00.02.01.00.03
HW: 1.0.2.0.1
FPGA version:
                   SPU  03.01.09
                   WPU  00.07.01
                   CCU  12.29.00
                   MCU  00.05


Note the changes in bold.
The HW version incremented and the MCU version did not change to MCU 02.12!

Any ideas why this is different than what others are seeing?

neslekkim:
Maybe I confused myself with this and the earlier talk about the LMH6518, I thought that one was not beeing changed on the hacked models, or is that something else or ?

marmad:

--- Quote from: alank2 on December 10, 2013, 06:16:18 pm ---Any idea why they dropped the 200M bandwidth limit?

--- End quote ---
Well, they didn't really drop it, per se, since it was never actually officially implemented in any firmware release (just an unused feature) - but perhaps they decided not to finally use it because, if serondays BW-limit chart is accurate:

the 100MHz limit gives you a -3dB BW of ~130MHz
the 200MHz limit gives you a -3dB BW of ~185MHz

...so only a ~55MHz difference between the settings.

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