diff --git a/synth/xilinx_spartan6/sincos.gise b/synth/xilinx_spartan6/sincos.gise
new file mode 100644
index 0000000..690444a
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+++ b/synth/xilinx_spartan6/sincos.gise
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diff --git a/synth/xilinx_spartan6/sincos.xise b/synth/xilinx_spartan6/sincos.xise
new file mode 100644
index 0000000..5cd210a
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+++ b/synth/xilinx_spartan6/sincos.xise
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diff --git a/synth/xilinx_spartan6/timing.ucf b/synth/xilinx_spartan6/timing.ucf
new file mode 100644
index 0000000..d3c9598
--- /dev/null
+++ b/synth/xilinx_spartan6/timing.ucf
@@ -0,0 +1,2 @@
+NET "clk" TNM_NET = "clk" ;
+TIMESPEC "TS_clk" = PERIOD "clk" 4 ns ;
diff --git a/synth/xilinx_spartan6/top_d18_p20.ucf b/synth/xilinx_spartan6/top_d18_p20.ucf
new file mode 100644
index 0000000..fca92a9
--- /dev/null
+++ b/synth/xilinx_spartan6/top_d18_p20.ucf
@@ -0,0 +1,4 @@
+
+#Created by Constraints Editor (xc6slx45-csg324-3) - 2016/04/18
+NET "clk" TNM_NET = clk;
+TIMESPEC TS_clk = PERIOD "clk" 4 ns HIGH 50%;