[Cryptech Tech] Alpha board main CPU change

[Basil Dolmatov]

Отправлено с iPhone

> 29 мая 2015 г., в 4:46, Jacob <jacob at edamaker.com> написал(а):
> 
>> On 5/28/2015 11:48 PM, Fredrik Thulin wrote:
>> Hi all
>> 
>> We've just finished two days of core team face to face meetings in Stockholm.
>> During these days, we unanimously decided to change the design for the
>> upcoming Alpha from using an ARM A9 to an ARM M4.
>> 
> 
> 
>> So... those interested might want to download the latest and greatest file
>> from https://wiki.cryptech.is/browser/doc/design/Alpha_board_drawing.pdf
>> 
>> (briefly, the plan is to use an STM32F4429 ARM Cortex M4 CPU running at 180
>> MHz. 128 MB of SDRAM, using the FMC interface to connect to the FPGA instead
>> of the Freescale EIM interface. As I understand it, the FMC interface will be
>> at least as fast as we were going to push the EIM).
>> 
> 
> STM32F4429 -> STM32F429
> 
> The ARM M4 has RTC in it, so I guess the external RTC chip is now redundant.
> 
> Also, realizing that I don't have any of the credentials required to enter into the sanctum sanctorum of the crypto world, and I know that this is bordering on heresy, but since M4 has a TRNG, will you trust it?
No. 
> If yes, what benefit is provided by the noise board, if any?
> If not, why would you trust the M4 to manage your external TRNG and FPGA core I/F?
Because. 
> 
> 
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