Add UCF for the z80 core

diff --git a/GBZ80Core.ucf b/GBZ80Core.ucf
new file mode 100644 (file)
index 0000000..5ff1f06
--- /dev/null
+++ b/GBZ80Core.ucf
@@ -0,0 +1,2 @@
+NET "clk" TNM_NET = clk;
+TIMESPEC TS_clk = PERIOD "clk" 10 MHz HIGH 50%;