[Cryptech Tech] Onchip Open-V TRNG

[Peter Stuge]

Columbian Onchip designed a TRNG peripheral into their microcontroller.
They use a ring oscillator with seemingly simple postprocessing. Their
paper:

https://github.com/onchipuis/mriscv/blob/master/fully-synthesized-trng.pdf

Referenced paper looking at ring oscillators:

http://web.eecs.umich.edu/faculty/blaauw/images/pdfs/YangAnAllDigitalEdge2016.pdf

Their campaign update:

https://www.crowdsupply.com/onchip/open-v/updates/open-true-random-number-generator