diff --git a/xc7/blinky.pcf b/xc7/blinky.pcf
index 98bd5071..7208a89d 100644
--- a/xc7/blinky.pcf
+++ b/xc7/blinky.pcf
@@ -1,6 +1,6 @@
-COMP "led1" LOCATE = SITE "M14" LEVEL 1;
-COMP "led2" LOCATE = SITE "M15" LEVEL 1;
-COMP "led3" LOCATE = SITE "G14" LEVEL 1;
-COMP "led4" LOCATE = SITE "D18" LEVEL 1;
-COMP "clki" LOCATE = SITE "L16" LEVEL 1;
-
+COMP "led0" LOCATE = SITE "M14" LEVEL 1;
+COMP "led1" LOCATE = SITE "M15" LEVEL 1;
+COMP "led2" LOCATE = SITE "G14" LEVEL 1;
+COMP "led3" LOCATE = SITE "D18" LEVEL 1;
+COMP "clki" LOCATE = SITE "K17" LEVEL 1;
+NET "clki" PERIOD = 8 nS ;