Add clock constraints file

1 files changed, 3 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index e30f1e8..e566393 100644
--- a/Makefile
+++ b/Makefile
@@ -64,13 +64,15 @@ clean:
 	--placed-svg $*.plc.svg \
 	--routed-svg $*.rt.svg \
 	-q -l $(PROGRAM).pnr.log \
+	--sdc clock.sdc \
 	|| \
 	nextpnr-gowin --json $< --write $@ \
 	--device GW1NR-LV9QN88PC6/I5 --family GW1N-9C \
 	--cst $(CST) \
 	--placed-svg $*.plc.svg \
 	--routed-svg $*.rt.svg \
-	-q -l $(PROGRAM).pnr.log
+	-q -l $(PROGRAM).pnr.log \
+	--sdc clock.sdc
 
 # pack bitstream
 %.fs: %.pnr.json