Products > Test Equipment
Sniffing the Rigol's internal I2C bus
PA0PBZ:
--- Quote from: fcab100 on December 10, 2013, 08:51:12 am ---No 50Ohm option here with DSHH. It's still gray out.
wonder What 0x1C020 actually does
ds2072 hw 2
--- End quote ---
If the DS2000A series has the 50 Ohm as standard, it would not make sense to have an option code for that.
zombie28:
--- Quote from: cybernet on December 10, 2013, 09:44:14 am ---i already saw the difference between ds2000a and ds2000 - same keys are used, but the inital epoint_set functionn uses (x,x,0,g) instead of (x,y,0,g) as arguments - doesnt make a difference in the rikey.c,
so im not sure whats going on (my math skills again ... :palm:) - jtag dump from a ds2000a would be useful.
--- End quote ---
For a given elliptic curve and a given value of x, there are at most two values of y that match this curve (let's call them y0 and y1). So to define some point on the curve you need to provide either both coordinates (x, y) or a value of x and a single bit (0 or 1) telling which value of y you chose. In the latter case the actual value of y will be computed by epoint_set function (it's called point decompression). When you call epoint_set(x,x,0,g), then you will get g = (x,y0), when you call epoint_set(x,x,1,g), then you will get g = (x,y1), and when you call epoint_set(x,y,0,g), then you will get g = (x,y), but y must be either y0 or y1 to match the curve.
A Hellene:
--- Quote from: cosmos on December 10, 2013, 11:47:29 am ---In the ds4k these straps are marked, and they correspond to the reported extended revision number.
--- End quote ---
Thank you for the information. Does the DS4k line have any hardware revisions (other than the basic one) with extended functionality, like the DS2kA and DS2kAS for example?
--- Quote ---It appears that the proASIC is the same or nearly the same s in the ds2k.
--- End quote ---
In the DS1002 line, the corresponding stage is the Lattice MachXO CPLD (which I called a LUT because it is not exactly a CPLD or an FPGA, but something in between).
-George
Maurizio:
--- Quote from: thetooth on December 03, 2013, 02:30:34 pm ---
--- Quote from: alank2 on December 03, 2013, 01:42:02 pm ---thetooth that is the same as the latest non A firmware, so either Rigol gave you the wrong firmware or they are going to use the same firmware for both the A and non A scopes. Probably they gave you the wrong one though as your scope shows something newer - I wouldn't load it!
Also, it isn't a rar but a zip you've attached.
--- End quote ---
yeah i gathered, also funnily enough the rigol rep sent me the image as a jpg file with instructions to rename it since he seemed to think it would be eaten.
I sent an email back to ask if they were sure this was for the A version so might see something new after all.
That sure did take a few attempts, i think the threshold is about 500ms lel
--- End quote ---
As reference, if it helps, these are the long infos from my brand new ds2102A just arrived last week.
All infos are the same of the picture of Thetooth except of the model name.
Only my 2 cents.
Maurizio
AndersAnd:
--- Quote from: A Hellene on December 10, 2013, 12:09:52 pm ---
--- Quote from: cosmos on December 10, 2013, 11:47:29 am ---In the ds4k these straps are marked, and they correspond to the reported extended revision number.
--- End quote ---
Thank you for the information. Does the DS4k line have any hardware revisions (other than the basic one) with extended functionality, like the DS2kA and DS2kAS for example?
--- End quote ---
There's both a DS4000 and a MSO4000 HW version. MSO4000 is just a DS4000 with buil-in 16-bit logic analyzer.
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