yosys/docs/source/code_examples/intro/counter.ys

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# read design
read_verilog counter.v
hierarchy -check -top counter
# the high-level stuff
proc; opt; memory; opt; fsm; opt
# mapping to internal cell library
techmap; opt
# mapping flip-flops to mycells.lib
dfflibmap -liberty mycells.lib
# mapping logic to mycells.lib
abc -liberty mycells.lib
# cleanup
clean
# write synthesized design
write_verilog synth.v