From: Wolfgang Moser (womo_at_news.trikaliotis.net)
Date: 2008-05-22 23:06:53
Hello Micha,
Michael Huth schrieb:
> In fact I'am no photoshop expert.
to clarify a bit, I'm no photoshop expert either,
it's just that I'm used to use it for some years.
> The rows (x-direction) were stitched
> together with ptgui and the columns (y-direction)
> was put together with photoshop since ptgui had serious problems. Mainly
> because the x-length of the resulting rows varied a little bit.
> For the fitting I used Multiply Blending and for putting it together
> Dissolve.
Hmmm, for the first two rows I used the layer
methods "inverse multiply" to find the best fit
and then changed it to luminance blending.
Later I chose "difference" blending for finding
the best fit especially obeying the via's round
shapes and shadows. It really worked out well.
> I'am not sure if this is suitable, but it looked reasonable well.
> If there are differences in X-direction it is due to the sharpness
> adjustment, if the sharpness was readjusted for the next column the
> image plane might have shifted which means it gets a bit more
> green/brown f.e..
Hmmm, to me it looks like as if the rows in
general are a bit brighter on top and a bit
darker at the bottom side. When two rows
connect to each other, the brightness change
becomes recognizable.
> This probably has happened at some column and also ptgui had problems
> there finding control points.
> Though it doesn't kills information.
That's true, it does in no way harm later
structure analysis.
Nevertheless I may find it funny to preprocess
the pieces a bit, if you're able to make them
available too.
>> In the structures to the right, I believe there are
>> some gates recognizable. These "L-JL"-pairs (upside down)
>> cold be some drivers stages. I thought on CMOS first
>> (PMOS coupled with NMOS along with a pre-driver), but
>> all these old chips are NMOS only.
>>
> I think in the right lower corner are some circuits for the analog output.
> Just a guess.
Hmmm, maybe....
In the upper quarter to the left, this must
be the line buffer with 12 rows of presumably
40 registers (D-flipflops or what?). Oliver
Achten mentioned that in the Forum-64 thread
where this story started for you.
>> Nevertheless I see the darkfield images same as you,
>> they give a big plus in recognizing lower layer
>> structures.
>>
>>
> However recording the whole die in darkfield mode would require more
> time, since the exposure time rises from 18 ms to about 3800 ms for one
> image plus several images for fine adjustment. So if someone thinks a
> darkfield image of a certain area would help him to resolve the circuit,
> I can take again some in a quick shot.
> (But best would be nearer future, i.e. the next months, you might want
> to take the opportunity).
Hmmm, if I should be able to dig up some other
65xx chips in ceramic package, would you like
to 'scope them also?
Well, sure, this would be pretty useless until
no one pops up who feels able to actually do
some circuit reengineering with these, but _I_
even like just watching to the circuits very much.
Womo
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