diff --git a/top/conv_ttl_rs485.ucf b/top/conv_ttl_rs485.ucf
index 7a9505af59b7424284f34617bf338dffcd7d6f69..f8fbe3b3156c4eef01b6078c9cbb2dc8e9a01f48 100644
--- a/top/conv_ttl_rs485.ucf
+++ b/top/conv_ttl_rs485.ucf
@@ -103,27 +103,27 @@ NET "inv_o[3]" IOSTANDARD = LVCMOS33;
 #------------------------------------------------------------------------------
 # Channel LEDs
 #------------------------------------------------------------------------------
-NET "led_front_o[0]" LOC = H3;
-NET "led_front_o[0]" IOSTANDARD = LVCMOS33;
-NET "led_front_o[1]" LOC = J4;
-NET "led_front_o[1]" IOSTANDARD = LVCMOS33;
-NET "led_front_o[2]" LOC = J3;
-NET "led_front_o[2]" IOSTANDARD = LVCMOS33;
-NET "led_front_o[3]" LOC = K3;
-NET "led_front_o[3]" IOSTANDARD = LVCMOS33;
-NET "led_front_o[4]" LOC = L4;
-NET "led_front_o[4]" IOSTANDARD = LVCMOS33;
-NET "led_front_o[5]" LOC = L3;
-NET "led_front_o[5]" IOSTANDARD = LVCMOS33;
-
-NET "led_inv_o[0]" LOC = AA4;
-NET "led_inv_o[0]" IOSTANDARD = LVCMOS33;
-NET "led_inv_o[1]" LOC = AB4;
-NET "led_inv_o[1]" IOSTANDARD = LVCMOS33;
-NET "led_inv_o[2]" LOC = AB5;
-NET "led_inv_o[2]" IOSTANDARD = LVCMOS33;
-NET "led_inv_o[3]" LOC = Y5;
-NET "led_inv_o[3]" IOSTANDARD = LVCMOS33;
+NET "led_front_n_o[0]" LOC = H3;
+NET "led_front_n_o[0]" IOSTANDARD = LVCMOS33;
+NET "led_front_n_o[1]" LOC = J4;
+NET "led_front_n_o[1]" IOSTANDARD = LVCMOS33;
+NET "led_front_n_o[2]" LOC = J3;
+NET "led_front_n_o[2]" IOSTANDARD = LVCMOS33;
+NET "led_front_n_o[3]" LOC = K3;
+NET "led_front_n_o[3]" IOSTANDARD = LVCMOS33;
+NET "led_front_n_o[4]" LOC = L4;
+NET "led_front_n_o[4]" IOSTANDARD = LVCMOS33;
+NET "led_front_n_o[5]" LOC = L3;
+NET "led_front_n_o[5]" IOSTANDARD = LVCMOS33;
+
+NET "led_inv_n_o[0]" LOC = AA4;
+NET "led_inv_n_o[0]" IOSTANDARD = LVCMOS33;
+NET "led_inv_n_o[1]" LOC = AB4;
+NET "led_inv_n_o[1]" IOSTANDARD = LVCMOS33;
+NET "led_inv_n_o[2]" LOC = AB5;
+NET "led_inv_n_o[2]" IOSTANDARD = LVCMOS33;
+NET "led_inv_n_o[3]" LOC = Y5;
+NET "led_inv_n_o[3]" IOSTANDARD = LVCMOS33;
 
 #------------------------------------------------------------------------------
 # Status LEDs