diff --git a/projects/mips_sys/ise101/mips_sys/ucf/systest.ucf b/projects/mips_sys/ise101/mips_sys/ucf/systest.ucf
index 7c82034..3a5602d 100644
--- a/projects/mips_sys/ise101/mips_sys/ucf/systest.ucf
+++ b/projects/mips_sys/ise101/mips_sys/ucf/systest.ucf
@@ -33,7 +33,7 @@ TIMESPEC "TS_unrelate_VGA" = FROM sys_clk TO vga_clk TIG;
 
 NET "cpu_clk" TNM_NET = "cpu_clk";
 TIMESPEC "TS_cpu_clk" = PERIOD "cpu_clk" 9.9 ns HIGH 50 %;
-TIMESPEC "TS_unrelate_CPU" = FROM sys_clk TO cpu_clk TIG;
+#TIMESPEC "TS_unrelate_CPU" = FROM sys_clk TO cpu_clk TIG;
 
 NET "sys_clk_in" LOC = "AE14";
 NET sys_clk_in IOSTANDARD = LVCMOS33;