diff --git a/projects/mips_sys/ise101/mips_sys/Makefile b/projects/mips_sys/ise101/mips_sys/Makefile
index 15989b8..12d00c8 100644
--- a/projects/mips_sys/ise101/mips_sys/Makefile
+++ b/projects/mips_sys/ise101/mips_sys/Makefile
@@ -12,6 +12,7 @@ translate: $(PRJ).ngd
 map: $(PRJ)_map.ncd
 par: $(PRJ).ncd
 bit: $(PRJ).bit
+timing : $(PRJ).twr
 
 # Netlist
 $(PRJ).ngc: $(DIRS) $(PREQ) ./project/$(PRJ).ucf
@@ -29,6 +30,10 @@ $(PRJ)_map.ncd: $(PRJ).ngd
 $(PRJ).ncd: $(PRJ)_map.ncd
 	par -w -intstyle xflow -ol high -t 1 $(PRJ)_map.ncd $(PRJ).ncd $(PRJ).pcf
 
+# Timing
+$(PRJ).twr: $(PRJ).ncd $(PRJ).pcf ./project/$(PRJ).ucf
+	trce -intstyle xflow -v 3 $(PRJ).ncd -ucf ./project/$(PRJ).ucf -o $(PRJ).twr $(PRJ).pcf 
+
 # Bitgen
 $(PRJ).bit: $(PRJ).ncd ./project/$(PRJ).ut
 	bitgen -intstyle xflow -f ./project/$(PRJ).ut $(PRJ).ncd