From 49cb2811e25f8becd31848642707d98bc94230eb Mon Sep 17 00:00:00 2001
From: uvok
Date: Thu, 25 Dec 2025 15:09:48 +0100
Subject: Add clock constraints file

---
 Makefile  | 4 +++-
 clock.sdc | 2 ++
 2 files changed, 5 insertions(+), 1 deletion(-)
 create mode 100644 clock.sdc

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
diff --git a/clock.sdc b/clock.sdc
new file mode 100644
index 0000000..5e64ad9
--- /dev/null
+++ b/clock.sdc
@@ -0,0 +1,2 @@
+create_clock -period 40.00 -name {clk} [get_ports {clk}]
+create_clock -period 40.00 -name {clk_i} [get_ports {clk_i}]
-- 
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