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Sniffing the Rigol's internal I2C bus

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Flipp:
What jtag  speed is possible with the fake altera blaster?

zombie28:

--- Quote from: sled on January 28, 2014, 02:41:05 am ---Watch out, here comes the dump: https://mega.co.nz/#!wwVi2YSZ!3o7nhjAZQ4RGAE4dks3HVjABZuFwiETEr78_JH2w-7s

Scope: DS2072A, fresh out of the box, produced in week 42.

--- End quote ---

Thank you for your dump - finally we have two dumps from different DS2072A scopes produced in the same week. The keys in these dumps are different, so it seems highly probable that every unit has its own keys. Consequently, it won't be possible to use the new keygen without extracting keys from the scope's memory (either flash or DRAM).

diyaudio:

--- Quote from: AndersAnd on January 28, 2014, 07:02:30 am ---
--- Quote from: granz on January 24, 2014, 02:26:13 pm ---
--- Quote from: cepphus on January 24, 2014, 11:21:10 am ---
Is this the JTAG that would work? I just got my 2072A and would just love to open it and play

http://www.ebay.com/itm/150943500360

--- End quote ---

Yes, that's the one.  In the JTAG connection diagram posted a little while back I used the second setup (pull-ups on TRST and SRST lines -- don't connect these to the programmer at all), but either way should work for you.

Good luck!

--- End quote ---
Altera USB-Blaster plug pinout (update)
http://hackingbtbusinesshub.wordpress.com/2011/09/12/usb-blaster-plug-connection/





--- End quote ---


bought one. :)

granz:

--- Quote from: sled on January 28, 2014, 01:49:06 pm ---here are some pics from my setup with the usb blaster,

Color Coding:

The TRST and SRST (white and violet) are NOT connected to the JTAG cable, they're only pulled high on the breadboard with the pull up resistors)

Gray: TCK
Green: TMS
Blue: TDO
Brown: TDI
Orange & Black: GND
Red: VCC (+3.3V)

(The wire on the breadboard that looks gray, is actually white!)

--- End quote ---

Nicely done!  That is great that you posted pictures.  I tried to explain many times that you don't need to (shouldn't!) connect TRST and SRST to the JTAG cable if you have pull-ups on those, so I'm glad you have validated this--there seemed to be a lot of confusion.

granz:

--- Quote from: Flipp on January 28, 2014, 05:02:46 pm ---What jtag  speed is possible with the fake altera blaster?

--- End quote ---

Hardware-wise I believe it's fixed at 12 MHz, but the blackfin UrJTAG stuff says something about inserting wait-states if I remember right...

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