  This article presents an electron tunneling noise programmable random variate
accelerator for accelerating the sampling stage of Monte Carlo simulations. We
used the LiteX framework to generate a FemtoRV imfc RISC-V instruction set soft
processor and deploy it on a Digilent Arty-100T FPGA development board. The
RISC-V soft processor augmented with our programmable random variate
accelerator achieves an average speedup of 8.70 times and a median speedup of
8.68 times for a suite of twelve different benchmark applications when compared
to GNU Scientific Library software random number generation. These speedups are
achievable because the benchmarks spend an average of 90.0 % of their execution
time generating random samples. The results of the Monte Carlo benchmark
programs run over the programmable random variate accelerator have an average
Wasserstein distance of 1.48 times and a median Wasserstein distance of 1.41
times that of the results produced by the GNU Scientific Library random number
generators. The soft processor samples the electron tunneling noise source
using the hardened XADC block in the FPGA. The flexibility of the LiteX
framework allows for the deployment of any LiteX-supported soft processor with
an electron tunneling noise programmable random variate accelerator on any
LiteX-supported development board that contains an FPGA with an XADC.
