Add option for routing supplies. Off by default, but enabled in unit test config files.

compiler/example_configs/big_config_scn4m_subm.py

@@ -6,6 +6,8 @@ process_corners = ["TT"]
 supply_voltages = [ 5.0 ]
 temperatures = [ 25 ]
 
+route_supplies = False
+
 output_path = "temp"
 output_name = "sram_{0}_{1}_{2}".format(word_size,num_words,tech_name)
 

compiler/example_configs/example_config_1rw_1r_scn4m_subm.py

@@ -10,6 +10,8 @@ process_corners = ["TT"]
 supply_voltages = [5.0]
 temperatures = [25]
 
+route_supplies = True
+
 output_path = "temp"
 output_name = "sram_1rw_1r_{0}_{1}_{2}".format(word_size,num_words,tech_name)
 

compiler/example_configs/medium_config_scn4m_subm.py

@@ -6,6 +6,8 @@ process_corners = ["TT"]
 supply_voltages = [ 3.3 ]
 temperatures = [ 25 ]
 
+route_supplies = False
+
 output_path = "temp"
 output_name = "sram_{0}_{1}_{2}".format(word_size,num_words,tech_name)
 

compiler/openram.py

@@ -48,8 +48,13 @@ debug.print_raw("Words per row: {}".format(c.words_per_row))
 
 #from parser import *
 output_extensions = ["sp","v","lib","py","html","log"]
+# Only output lef/gds if back-end
 if not OPTS.netlist_only:
-    output_extensions.extend(["gds","lef"])
+    output_extensions.extend(["lef"])
+    # Only output gds if final routing
+    if OPTS.route_supplies:
+        output_extensions.extend(["gds"])
+        
 output_files = ["{0}{1}.{2}".format(OPTS.output_path,OPTS.output_name,x) for x in output_extensions]
 debug.print_raw("Output files are: ")
 for path  in output_files:

compiler/options.py

@@ -8,10 +8,41 @@ class options(optparse.Values):
     that is the sole required command-line positional argument for openram.py.
     """
 
+    ###################
+    # Configuration options
+    ###################
     # This is the technology directory.
     openram_tech = ""
+    
     # This is the name of the technology.
     tech_name = ""
+    
+    # Port configuration (1-2 ports allowed)
+    num_rw_ports = 1
+    num_r_ports = 0
+    num_w_ports = 0
+    
+    # These will get initialized by the user or the tech file
+    supply_voltages = ""
+    temperatures = ""
+    process_corners = ""
+
+    # Size parameters must be specified by user in config file.
+    #num_words = 0
+    #word_size = 0
+    # You can manually specify banks, but it is better to auto-detect it.
+    num_banks = 1
+
+    ###################
+    # Optimization options
+    ###################    
+    # Uses the delay chain size in the tech.py file rather automatic sizing.
+    use_tech_delay_chain_size = False
+
+
+    ###################
+    # Debug options.
+    ###################    
     # This is the temp directory where all intermediate results are stored.
     try:
         # If user defined the temporary location in their environment, use it
@@ -22,12 +53,27 @@ class options(optparse.Values):
     # This is the verbosity level to control debug information. 0 is none, 1
     # is minimal, etc.
     debug_level = 0
+
+    ###################
+    # Run-time vs accuracy options.
+    ###################
     # When enabled, layout is not generated (and no DRC or LVS are performed)
     netlist_only = False
+    # Whether we should do the final power routing
+    route_supplies = False
     # This determines whether LVS and DRC is checked at all.
     check_lvsdrc = True
     # This determines whether LVS and DRC is checked for every submodule.
     inline_lvsdrc = False
+    # Remove noncritical memory cells for characterization speed-up
+    trim_netlist = True
+    # Run with extracted parasitics
+    use_pex = False
+
+    
+    ###################
+    # Tool options
+    ###################
     # Variable to select the variant of spice
     spice_name = ""
     # The spice executable being used which is derived from the user PATH.
@@ -40,12 +86,9 @@ class options(optparse.Values):
     drc_exe = None
     lvs_exe = None
     pex_exe = None
+    
     # Should we print out the banner at startup
     print_banner = True
-    # Run with extracted parasitics
-    use_pex = False
-    # Remove noncritical memory cells for characterization speed-up
-    trim_netlist = True
     # Use detailed LEF blockages
     detailed_blockages = True
     # Define the output file paths
@@ -57,28 +100,10 @@ class options(optparse.Values):
     # Purge the temp directory after a successful run (doesn't purge on errors, anyhow)
     purge_temp = True
 
-    # These are the configuration parameters
-    num_rw_ports = 1
-    num_r_ports = 0
-    num_w_ports = 0
-    
-    # These will get initialized by the the file
-    supply_voltages = ""
-    temperatures = ""
-    process_corners = ""
-
-    # These are the main configuration parameters that should be over-ridden
-    # in a configuration file.
-    #num_words = 0
-    #word_size = 0
-
-    # You can manually specify banks, but it is better to auto-detect it.
-    num_banks = 1
-    
-    #Uses the delay chain size in the tech.py file rather automatic sizing.
-    use_tech_delay_chain_size = False
 
+    ###################    
     # These are the default modules that can be over-riden
+    ###################    
     bank_select = "bank_select"
     bitcell_array = "bitcell_array"
     bitcell = "bitcell"

compiler/sram.py

@@ -62,13 +62,6 @@ class sram():
         """ Save all the output files while reporting time to do it as well. """
 
         if not OPTS.netlist_only:
-            # Write the layout
-            start_time = datetime.datetime.now()
-            gdsname = OPTS.output_path + self.s.name + ".gds"
-            debug.print_raw("GDS: Writing to {0}".format(gdsname))
-            self.gds_write(gdsname)
-            print_time("GDS", datetime.datetime.now(), start_time)
-
             # Create a LEF physical model
             start_time = datetime.datetime.now()
             lefname = OPTS.output_path + self.s.name + ".lef"
@@ -76,6 +69,16 @@ class sram():
             self.lef_write(lefname)
             print_time("LEF", datetime.datetime.now(), start_time)
 
+            if OPTS.route_supplies:
+                # Write the layout
+                start_time = datetime.datetime.now()
+                gdsname = OPTS.output_path + self.s.name + ".gds"
+                debug.print_raw("GDS: Writing to {0}".format(gdsname))
+                self.gds_write(gdsname)
+                print_time("GDS", datetime.datetime.now(), start_time)
+
+            
+        
         # Save the spice file
         start_time = datetime.datetime.now()
         spname = OPTS.output_path + self.s.name + ".sp"

compiler/sram_base.py

@@ -110,7 +110,8 @@ class sram_base(design, verilog, lef):
         self.height = highest_coord[1]
 
         start_time = datetime.now()
-        self.DRC_LVS(final_verification=True)
+        # We only enable final verification if we have routed the design
+        self.DRC_LVS(final_verification=OPTS.route_supplies)
         if not OPTS.is_unit_test:
             print_time("Verification",datetime.now(), start_time)
 
@@ -120,6 +121,10 @@ class sram_base(design, verilog, lef):
     def route_supplies(self):
         """ Route the supply grid and connect the pins to them. """
 
+        # Do not route the power supply 
+        if not OPTS.route_supplies:
+            return
+        
         for inst in self.insts:
             self.copy_power_pins(inst,"vdd")
             self.copy_power_pins(inst,"gnd")

compiler/tests/config_freepdk45.py

@@ -5,5 +5,6 @@ tech_name = "freepdk45"
 process_corners = ["TT"]
 supply_voltages = [1.0]
 temperatures = [25]
+route_supplies = True
 
 

compiler/tests/config_freepdk45_front_end.py

@@ -1,8 +1,10 @@
 word_size = 1
 num_words = 16
 
-tech_name = "scn3me_subm"
+tech_name = "freepdk45"
 process_corners = ["TT"]
-supply_voltages = [5.0]
+supply_voltages = [1.0]
 temperatures = [25]
 
+
+

compiler/tests/config_scn4m_subm.py

@@ -5,6 +5,7 @@ tech_name = "scn4m_subm"
 process_corners = ["TT"]
 supply_voltages = [5.0]
 temperatures = [25]
+route_supplies = True
 
 drc_name = "magic"
 lvs_name = "netgen"

compiler/tests/config_scn4m_subm_front_end.py

@@ -0,0 +1,12 @@
+word_size = 1
+num_words = 16
+
+tech_name = "scn4m_subm"
+process_corners = ["TT"]
+supply_voltages = [5.0]
+temperatures = [25]
+
+drc_name = "magic"
+lvs_name = "netgen"
+pex_name = "magic"
+