[Cryptech Tech] STM32F4 <-> Novena Bridge

[Павел Шатов]

On 11.06.2015 1:13, Fredrik Thulin wrote:
> On Friday, June 05, 2015 10:40:29 PM Павел Шатов wrote:
>> Hello!
>>
>> Fredrik, this is mostly for you. My suggestions regarding connection of
>> STM32F4 to Novena are listed in the attached PDF file.
>
> I've started this task, see the attached picture for tentative board size
> (10x5 cm) and placements.
>
> I thought that I might as well base the board on the Novena Entropy Source
> board, and am considering leaving the entropy source on there as well, since
> these schematics might become part of the Alpha board schematics as it seems.
>
> I'm keeping to all your suggestions about FMC_CLK and the less length matched
> pins. Since I have the noise source on the board, I'm considering ditching
> FMC_A22 in favor of keeping the entropy source connected to the FPGA on the
> Novena (using one of the three less length matched pins). What do you think is
> most valuable on this board, another address bit or the entropy source?
>
> I need to get a new Eagle license to do four layers. I figured I could start
> working with the two layers I've got, and then when I have a new license I can
> add the power and ground inner layers.
>
> /Fredrik
>
> PS. Did you (Pavel) get a response from Schematica regarding Eagle schematics?
>

Yes, they accept schematics in EAGLE format as input.

My opinion is, that having noise source is more important, than having 
extra address lines. If you disconnect one more address bit, we will 
have as many, as we currently have between i.MX6Q and FPGA in Novena.

--
With best regards,
Pavel Shatov