diff --git a/Makefile b/Makefile
index 47b9463..7ed3fa0 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,6 @@
-TARGETS = $(shell find lib/ -name "*.make")
+FOLDER ?= lib
+
+TARGETS = $(shell find $(FOLDER)/ -name "*.make")
 INSTR := $(foreach number,$(TARGETS),make -C $(shell dirname $(number)) -f $(shell basename $(number)) $(MAKECMDGOALS) &&) true
 
 all:
diff --git a/make/ise.mk b/make/ise.mk
new file mode 100644
index 0000000..255bbce
--- /dev/null
+++ b/make/ise.mk
@@ -0,0 +1,50 @@
+.PHONY: clean
+all:	bit
+
+netlist: $(PRJ).ngc
+translate: $(PRJ).ngd
+map: $(PRJ)_map.ncd
+par: $(PRJ).ncd
+bit: $(PRJ).bit
+prom : $(PRJ).mcs
+timing : $(PRJ).twr
+
+# Netlist
+$(PRJ).ngc: $(DIRS) $(PREQ) ./project/$(PRJ).ucf
+	xst -intstyle xflow -ifn ./project/$(PRJ).xst
+
+# Translate
+$(PRJ).ngd: $(NETLISTS) $(PRJ).ngc ./project/$(PRJ).ucf
+	ngdbuild -p $(DEVICE) -sd $(NETLIST_DIR) -dd _ngo -nt timestamp -uc ./project/$(PRJ).ucf $(PRJ).ngc $(PRJ).ngd
+
+# Map
+$(PRJ)_map.ncd: $(PRJ).ngd
+	map -intstyle xflow -p $(DEVICE) -timing -logic_opt on -ol high -t 1 -register_duplication -cm area -ignore_keep_hierarchy -pr off -k 4 -power off -o $(PRJ)_map.ncd $(PRJ).ngd $(PRJ).pcf
+
+# PAR
+$(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 $(PRJ).ncd
+
+# Promgen
+$(PRJ).mcs: $(PRJ).bit
+	promgen -w -p mcs -c FF -o $(PRJ) -ver 0 $(PRJ).bit -x xcf32p
+
+$(DIRS):
+	mkdir -p $(DIRS)
+
+clean:
+	rm -rf ./_ngo
+	rm -rf ./xst
+	rm -rf ./xlnx_auto_0_xdb
+	rm -f xlnx_auto_0.ise
+	rm -f smartpreview.twr
+	rm -f $(PRJ)*.*
+	
diff --git a/projects/mips_sys/ise101/mips_sys/Makefile b/projects/mips_sys/ise101/mips_sys/Makefile
index b33327f..9a85ec6 100644
--- a/projects/mips_sys/ise101/mips_sys/Makefile
+++ b/projects/mips_sys/ise101/mips_sys/Makefile
@@ -1,62 +1,10 @@
-.PHONY: clean
-
-all:	bit
-
 PRJ := mips_sys
 PREQ := ./project/$(PRJ).prj ./project/$(PRJ).xst ./project/$(PRJ).lso
 DEVICE := "xc4vsx35-ff668-10"
 DIRS := ./xst/tmp
 
 NETLIST_DIR := ../../../../lib/CPUs/MIPS/syn/ise101
-NETLIST_MIPS_TOP := $(NETLIST_DIR)/mips_top.ngc
+NETLISTS := $(NETLIST_DIR)/mips_top.ngc
 
-netlist: $(PRJ).ngc
-translate: $(PRJ).ngd
-map: $(PRJ)_map.ncd
-par: $(PRJ).ncd
-bit: $(PRJ).bit
-prom : $(PRJ).mcs
-timing : $(PRJ).twr
+include ../../../../make/ise.mk
 
-$(NETLIST_MIPS_TOP):
-	make -C $(NETLIST_DIR)
-	
-# Netlist
-$(PRJ).ngc: $(DIRS) $(PREQ) ./project/$(PRJ).ucf
-	xst -intstyle xflow -ifn ./project/$(PRJ).xst
-
-# Translate
-$(PRJ).ngd: $(NETLIST_MIPS_TOP) $(PRJ).ngc ./project/$(PRJ).ucf
-	ngdbuild -p $(DEVICE) -sd $(NETLIST_DIR) -dd _ngo -nt timestamp -uc ./project/$(PRJ).ucf $(PRJ).ngc $(PRJ).ngd
-
-# Map
-$(PRJ)_map.ncd: $(PRJ).ngd
-	map -intstyle xflow -p $(DEVICE) -timing -logic_opt on -ol high -t 1 -register_duplication -cm area -ignore_keep_hierarchy -pr off -k 4 -power off -o $(PRJ)_map.ncd $(PRJ).ngd $(PRJ).pcf
-
-# PAR
-$(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 $(PRJ).ncd
-
-# Promgen
-$(PRJ).mcs: $(PRJ).bit
-	promgen -w -p mcs -c FF -o $(PRJ) -ver 0 $(PRJ).bit -x xcf32p
-
-$(DIRS):
-	mkdir -p $(DIRS)
-
-clean:
-	rm -rf ./_ngo
-	rm -rf ./xst
-	rm -rf ./xlnx_auto_0_xdb
-	rm -f xlnx_auto_0.ise
-	rm -f smartpreview.twr
-	rm -f $(PRJ)*.*
-