4.3. Treadle and FIRRTL Interpreter
Treadle and FIRRTL Interpreter are circuit simulators that directly execute FIRRTL (specifically low-firrtl IR). Treadle is the replacement for FIRRTL Interpreter but FIRRTL Interpreter is still used within some projects. Treadle is useful for simulating modules in a larger SoC design. Many projects use Treadle for interactive debugging and a low-overhead simulator.