Only output wmask to lib file in w or rw ports.

compiler/characterizer/lib.py

@@ -131,18 +131,18 @@ class lib:
 
         self.write_header()
         
-        #Loop over all ports. 
+        # Loop over all ports. 
         for port in self.all_ports:
-            #set the read and write port as inputs.
+            # set the read and write port as inputs.
             self.write_data_bus(port)
             self.write_addr_bus(port)
-            if self.sram.write_size:
+            if self.sram.write_size and port in self.write_ports:
                 self.write_wmask_bus(port)
-            self.write_control_pins(port) #need to split this into sram and port control signals
+            # need to split this into sram and port control signals
+            self.write_control_pins(port)
             self.write_clk_timing_power(port)
 
         self.write_footer()
-
         
     def write_footer(self):
         """ Write the footer """