diff --git a/firmware/cpld/sgpio_if/sgpio_if.xise b/firmware/cpld/sgpio_if/sgpio_if.xise
index 538bd875..bf18e4fd 100755
--- a/firmware/cpld/sgpio_if/sgpio_if.xise
+++ b/firmware/cpld/sgpio_if/sgpio_if.xise
@@ -131,7 +131,7 @@
     <property xil_pn:name="Other XST Command Line Options" xil_pn:value="" xil_pn:valueState="default"/>
     <property xil_pn:name="Output Extended Identifiers" xil_pn:value="false" xil_pn:valueState="default"/>
     <property xil_pn:name="Output File Name" xil_pn:value="top" xil_pn:valueState="default"/>
-    <property xil_pn:name="Output Slew Rate" xil_pn:value="Fast" xil_pn:valueState="default"/>
+    <property xil_pn:name="Output Slew Rate" xil_pn:value="Slow" xil_pn:valueState="non-default"/>
     <property xil_pn:name="Overwrite Compiled Libraries" xil_pn:value="false" xil_pn:valueState="default"/>
     <property xil_pn:name="Package" xil_pn:value="VQ100" xil_pn:valueState="non-default"/>
     <property xil_pn:name="Port to be used" xil_pn:value="Auto - default" xil_pn:valueState="default"/>
diff --git a/firmware/cpld/sgpio_if/top.ucf b/firmware/cpld/sgpio_if/top.ucf
index 2104db81..8d45fbaf 100755
--- a/firmware/cpld/sgpio_if/top.ucf
+++ b/firmware/cpld/sgpio_if/top.ucf
@@ -39,31 +39,31 @@ NET "DA<4>"  LOC = "P39" ;
 NET "DA<5>"  LOC = "P37" ; 
 NET "DA<6>"  LOC = "P36" ; 
 NET "DA<7>"  LOC = "P35" ; 
-NET "DD<0>"  LOC = "P34" | SLEW = SLOW ; 
-NET "DD<1>"  LOC = "P33" | SLEW = SLOW ; 
-NET "DD<2>"  LOC = "P32" | SLEW = SLOW ; 
-NET "DD<3>"  LOC = "P30" | SLEW = SLOW ; 
-NET "DD<4>"  LOC = "P29" | SLEW = SLOW ; 
-NET "DD<5>"  LOC = "P28" | SLEW = SLOW ; 
-NET "DD<6>"  LOC = "P24" | SLEW = SLOW ; 
-NET "DD<7>"  LOC = "P19" | SLEW = SLOW ; 
-NET "DD<8>"  LOC = "P18" | SLEW = SLOW ; 
-NET "DD<9>"  LOC = "P17" | SLEW = SLOW ; 
-NET "HOST_CAPTURE"  LOC = "P91" | SLEW = SLOW ; 
-NET "HOST_DATA<0>"  LOC = "P89" | SLEW = SLOW ; 
-NET "HOST_DATA<1>"  LOC = "P79" | SLEW = SLOW ; 
-NET "HOST_DATA<2>"  LOC = "P74" | SLEW = SLOW ; 
-NET "HOST_DATA<3>"  LOC = "P72" | SLEW = SLOW ; 
-NET "HOST_DATA<4>"  LOC = "P67" | SLEW = SLOW ; 
-NET "HOST_DATA<5>"  LOC = "P64" | SLEW = SLOW ; 
-NET "HOST_DATA<6>"  LOC = "P61" | SLEW = SLOW ; 
-NET "HOST_DATA<7>"  LOC = "P77" | SLEW = SLOW ; 
+NET "DD<0>"  LOC = "P34" ; 
+NET "DD<1>"  LOC = "P33" ; 
+NET "DD<2>"  LOC = "P32" ; 
+NET "DD<3>"  LOC = "P30" ; 
+NET "DD<4>"  LOC = "P29" ; 
+NET "DD<5>"  LOC = "P28" ; 
+NET "DD<6>"  LOC = "P24" ; 
+NET "DD<7>"  LOC = "P19" ; 
+NET "DD<8>"  LOC = "P18" ; 
+NET "DD<9>"  LOC = "P17" ; 
+NET "HOST_CAPTURE"  LOC = "P91" ; 
+NET "HOST_DATA<0>"  LOC = "P89" ; 
+NET "HOST_DATA<1>"  LOC = "P79" ; 
+NET "HOST_DATA<2>"  LOC = "P74" ; 
+NET "HOST_DATA<3>"  LOC = "P72" ; 
+NET "HOST_DATA<4>"  LOC = "P67" ; 
+NET "HOST_DATA<5>"  LOC = "P64" ; 
+NET "HOST_DATA<6>"  LOC = "P61" ; 
+NET "HOST_DATA<7>"  LOC = "P77" ; 
 NET "HOST_DIRECTION"  LOC = "P71" ; 
 NET "HOST_DISABLE"  LOC = "P76" ; 
 NET "HOST_Q_INVERT"  LOC = "P70" ;
 NET "HOST_SYNC_EN" LOC = "P90" ; 
 NET "HOST_SYNC"  LOC = "P55" | PULLUP ; 
-NET "HOST_SYNC_CMD"  LOC = "P56"  | SLEW = SLOW ; 
+NET "HOST_SYNC_CMD"  LOC = "P56" ; 
 
 #PACE: Start of PACE Area Constraints