[sdiy] SSM2040

[ASSI]

Hi folks,

On Samstag 03 November 2007, ASSI wrote:
> The CEM chips were based on an earlier incarnation of
> that same idea (wafers probably run by GEC Plessey) - if somebody
> could send me a non-working (but not burnt out) CEM chip, I'd open it
> to make a die photo...

well, somebody did and the first result is up on on my website.

http://Synth.Stromeko.net/DIY.html#CEMpics

If anybody has dead chips not listed on this page, please get in touch 
with me directly.

While I have tracked down one of the Interdesign/Ferranti books ("201 
Analog IC designs - Functional Blocks for Monochip Custom Integrated 
Circuits" issue 5/1981), I'm still lacking the floorplan for the chips, 
which presumably were available with the design manual (which I haven't 
found any further leads to).  It's not impossible to reverse engineer 
this - I have larger micrographs that aren't posted to the web for now 
since they are too big - but it would take a lot of time.  I know that 
some folks on this list had (and hopefully still have) access to this 
material, so if you could please contact me and we can perhaps work 
something out.

The similarities with the Zetex 700 series are striking (no surpises), 
but there are also quite a few differences, especially in how the 
resistors are done.  On the 700 series (which simply has more 
documentation), I have finally found a free program that could be used 
to design for these with no upfront cost:

http://www.lasihomesite.com/

I have already verified that it can read the GDSII files for the 700 
series parts.  It would still be a bit of work to bung things into 
shape (the program does make a few assumtions that you have to take 
care of) and add symbols to the cells, but then it should even be 
possible to generate a SPICE netlist and simulate the circuit.  I'll 
have to check if SPICE Opus will work together with LASI, if yes this 
should also be completely free of any restrictions.


Achim.
-- 
+<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk]>+

SD adaptation for Waldorf microQ V2.22R2:
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