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

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# read
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read_verilog counter.v
hierarchy -check -top counter
show -notitle -format dot -prefix counter_00
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# elaborate
proc
show -notitle -format dot -prefix counter_proc
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opt
show -notitle -format dot -prefix counter_01
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# mapping to internal cell library
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techmap; opt
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splitnets -ports;;
show -notitle -format dot -prefix counter_02
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# mapping flip-flops to mycells.lib
dfflibmap -liberty mycells.lib
# mapping logic to mycells.lib
abc -liberty mycells.lib
# cleanup
clean
show -notitle -lib mycells.v -format dot -prefix counter_03