[sdiy] FPAA for analog synthesis?

[Dave Manley]

ASSI wrote:
> On Wednesday 03 March 2010, Dave Manley wrote:
>   
>> Assuming I understand what you're asking, the array underlying a
>> CEM design is general purpose device.  It contains a number of
>> transistors, resistors and capacitors, that can be hooked
>> together.
>>     
>
> There are no capacitors (save the parasitic ones) in the CEM arrays 
> and they are different from the Array700 series.  More info on my 
> website:
>
> http://Synth.Stromeko.net/DIY.html#CEMpics
>
> There is just a single level of wiring that can be mask programmed and 
> it can be gleaned how painful this must have been at times by just 
> following the traces.
>
>   
The Array700 has what they call a 'junction capacitor' which are under 
some of the pads.  Are these not available in the Interdesign parts?

I presume the Interdesign arrays also have "cross unders" which helps to 
obscure the interconnect.   Back in the mid 80's I routed some single 
metal layer 3 to 5 micron gate arrays (they had a grand total of <5K 
gates :-) ), and the limited routing resources definitely made routing a 
challenge, forcing the use of a transistor gate as part of the route on 
occasion.

BTW, I've never been able to track down the data books you reference on 
your web page.  Too bad there's not a pdf available anywhere...

-Dave