#ulx3s — Public Fediverse posts

I am happy to announce the release of a longwave software defined radio which I designed at work for experiments with #DSP algorithms, running on the #ULX3S #FPGA board. The user interface is based on #Mecrisp #Forth running on the #FemtoRV, and the signal chain contains a pipelined FFT designed by Dan Gisselquist. Many thanks to Ulixxe for their USB-CDC implementation!

https://github.com/mb-sat/ulx3s-longwave-sdr
https://codeberg.org/Mecrisp/ulx3s-longwave-sdr

On the left: floorplan of #femtorv-quark on the #ULX3S (85Kluts variant). On the right, floorplan of "Tordboyau", pipelined with branch prediction. The right one is nearly 5 times faster than the left one, because
(but eats-up a larger portion of the ECP5).
Regarding source-code, the left one weights 200 lines (https://github.com/BrunoLevy/learn-fpga/blob/master/FemtoRV/TUTORIALS/FROM_BLINKER_TO_RISCV/step18.v) and the right one around 800 lines (https://github.com/BrunoLevy/TordBoyau/blob/main/TordBoyau5.v)

packing for hollidays, a couple of FPGAs just in case. what fmax can #femtorv-tordboyau reach on the #ULX3S, on the OrangeCrab and on the IceBreaker ? We shall see !