[Cryptech Tech] STM32 FMC problem

[Joachim Strömbergson]

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Aloha!

Павел Шатов wrote:
> I suggested adding this generator, because it is a generally
> accepted design practice to provide dedicated clock generator for
> FPGA. This generator will be necessary, if people want FPGA to do
> something useful even when STM32 is not supplying any clock signal.
> Our cores can be clocked not only at 50 MHz, we can use DCM_SP or
> PLL_BASE primitives (they are in fact PLLs) to generate some other
> frequency out of this 50 MHz reference clock. That's how it is done
> in current version of clock manager module, btw.

Yes, of course.


> The good news is, that I actually ditched DMA engine idea from the 
> errata and adapted what Peter suggested earlier, namely configuring 
> NWAIT pin as GPIO and polling it manually after reading or writing.
> This seems to be stable, I tried leaving my demo program running at
> 90 MHz for more than an hour yesterday and didn't get any data
> transfer errors. The code needs a bit of polishing, I think, I will
> upload it during the weekend. It would be great, if you and Fredrik
> could test it then.

This is good news.

- -- 
Med vänlig hälsning, Yours

Joachim Strömbergson - Alltid i harmonisk svängning.
========================================================================
 Joachim Strömbergson          Secworks AB          joachim at secworks.se
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