yosys/manual/PRESENTATION_Intro/counter.ys

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# read design
read_verilog counter.v
hierarchy -check -top counter
show -stretch -format pdf -prefix counter_00
# the high-level stuff
proc; opt; memory; opt; fsm; opt
show -stretch -format pdf -prefix counter_01
# mapping to internal cell library
techmap; splitnets -ports; opt
show -stretch -format pdf -prefix counter_02
# mapping flip-flops to mycells.lib
dfflibmap -liberty mycells.lib
# mapping logic to mycells.lib
abc -liberty mycells.lib
# cleanup
clean
show -stretch -lib mycells.v -format pdf -prefix counter_03