[Cryptech Tech] TRNG is alive!

[tryggve.mathiesen at informasic.com]

Hello Joacim!

Congrats to the working TRNG.

> BTW: Xilinx really don't like the combinational loops in the ring
> oscillators and thinks they are all the same, thus removing all but 
> one.
> Its fixable with compiler directives.

Two comments about Xilinx:
1) Placement and routing, as well as reduction optimization around comb 
loops can be controlled/solved in ISE/Vivado tool chain.
2) Consider to use the existing ring osc in Xilinx FPGAs
  a) JTAG clock is Ring Osc based - accessable after FPGA load
  b) Spatran6 and others using Ring OSc. for DCI and DelayI/DelayO timing 
reference.
  c) 7-Series have RingOSc for the GTP clockbase in low speed modes (only 
GTP macro FPGAs)

I will be of help if more details is needed, sorry to such "passive" 
follower ....

Best Regards,

Tryggve Mathiesen

CTO
InformAsic AB
Hugo Grauers Gata 3B
SE-411 33 Göteborg
Email: Tryggve.Mathiesen at informasic.com
www.informasic.com
Kontor nummer: +46(0)31-685 490
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Privat  mobil: +46(0)708-579552

2014-10-02 11:12 skrev Joachim Strömbergson:
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> 
> Aloha!
> 
> If anybody is interested: The TRNG is now running on the TerasIC
> DE0-Nano board(!). Complete chain with both ring oscillator based
> entropy source and avalanche noise entropy driven by Fredriks board.
> 
> It has been a wee bit of a struggle due to some much needed API and
> interface changes. (Things that you start to realize only when you get
> your elbows dirty, way down into the code.)
> 
> I'll create some images and some simple data dumps. But next up is
> getting the trng running on Novena. Time to really get busy with the
> Novena as Cryptech platform.
> 
> BTW: Xilinx really don't like the combinational loops in the ring
> oscillators and thinks they are all the same, thus removing all but 
> one.
> Its fixable with compiler directives.
> 
> - --
> Med vänlig hälsning, Yours
> 
> Joachim Strömbergson - Alltid i harmonisk svängning.
> ========================================================================
>  Joachim Strömbergson          Secworks AB          joachim at secworks.se
> ========================================================================
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