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diff --git a/examples/gowin/run.sh b/examples/gowin/run.sh
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+#!/bin/bash
+set -ex
+yosys -p "synth_gowin -top demo -vout demo_syn.v" demo.v
+$GOWIN_HOME/bin/gowin -d demo_syn.v -cst demo.cst -sdc demo.sdc -p GW2A55-PBGA484-6 \
+ -warning_all -out demo_out.v -rpt demo.rpt -tr demo_tr.html -bit demo.bit
+
+# post place&route simulation (icarus verilog)
+if false; then
+ iverilog -D POST_IMPL -o testbench -s testbench testbench.v \
+ demo_out.v $(yosys-config --datdir/gowin/cells_sim.v)
+ vvp -N testbench
+fi