For beginners
Simple cores with tests: easy to read and reproduce.
5 cores
Collections
A quick start by task. Still check each core’s license and tests.
Tang Nano 20K
Cores with Tang Nano 20K compatibility records.
1 cores
Open toolchains
Cores for Yosys, nextpnr, Verilator and GHDL.
0 cores
Production candidates
Board-proven, or tested with a known license. The decision is still yours.
36 cores
Audio
PDM, I2S and sound synthesis.
4 cores
RISC-V
RISC-V soft CPUs by maturity.
19 cores
Retro
Arcade and computer cores. Check ROM rights.
5 cores