[libre-riscv-dev] buffered pipeline

[Jacob Lifshay]

I'm building an RC4 random number source for simulation since it's a very
good source of random numbers (being designed as a stream cipher and all)
and has an extremely simple implementation (256-byte 3-read 2-write memory
and a few adders and muxes).
I can't just use the preexisting random() function because the state is
shared. I thought we might want a synthesizable source of
non-cryptographically secure random numbers later anyway.

Jacob

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