Add spectre simulator

compiler/characterizer/charutils.py

@@ -5,6 +5,7 @@
 # (acting for and on behalf of Oklahoma State University)
 # All rights reserved.
 #
+import os
 import re
 import debug
 from globals import OPTS
@@ -20,6 +21,8 @@ def parse_spice_list(filename, key):
     if OPTS.spice_name == "xa" :
         # customsim has a different output file name
         full_filename="{0}xa.meas".format(OPTS.openram_temp)
+    elif OPTS.spice_name == "spectre":
+        full_filename = os.path.join(OPTS.openram_temp, "delay_stim.measure")
     else:
         # ngspice/hspice using a .lis file
         full_filename="{0}{1}.lis".format(OPTS.openram_temp, filename)

compiler/characterizer/delay.py

@@ -387,6 +387,9 @@ class delay(simulation):
         self.delay_stim_sp = "delay_stim.sp"
         temp_stim = "{0}/{1}".format(OPTS.openram_temp, self.delay_stim_sp)
         self.sf = open(temp_stim, "w")
+
+        if OPTS.spice_name == "spectre":
+            self.sf.write("simulator lang=spice\n")
         self.sf.write("* Delay stimulus for period of {0}n load={1}fF slew={2}ns\n\n".format(self.period,
                                                                                              self.load,
                                                                                              self.slew))

compiler/characterizer/stimuli.py

@@ -247,16 +247,39 @@ class stimuli():
         timestep = 10 # ps, was 5ps but ngspice was complaining the timestep was too small in certain tests.
 
         # UIC is needed for ngspice to converge
-        self.sf.write(".TRAN {0}p {1}n UIC\n".format(timestep, end_time))
+
         self.sf.write(".TEMP {}\n".format(self.temperature))
         if OPTS.spice_name == "ngspice":
             # ngspice sometimes has convergence problems if not using gear method
             # which is more accurate, but slower than the default trapezoid method
             # Do not remove this or it may not converge due to some "pa_00" nodes
             # unless you figure out what these are.
+            self.sf.write(".TRAN {0}p {1}n UIC\n".format(timestep, end_time))
             self.sf.write(".OPTIONS POST=1 RELTOL={0} PROBE method=gear\n".format(reltol))
+        elif OPTS.spice_name == "spectre":
+            self.sf.write("simulator lang=spectre\n")
+            if OPTS.use_pex:
+                nestlvl = 1
+                spectre_save = "selected"
+            else:
+                nestlvl = 10
+                spectre_save = "lvlpub"
+            self.sf.write('saveOptions options save={} nestlvl={} pwr=total \n'.format(
+                spectre_save, nestlvl))
+            self.sf.write("simulatorOptions options reltol=1e-3 vabstol=1e-6 iabstol=1e-12 temp={0} try_fast_op=no "
+                          "rforce=10m maxnotes=10 maxwarns=10 "
+                          " preservenode=all topcheck=fixall "
+                          "digits=5 cols=80 dc_pivot_check=yes pivrel=1e-3 "
+                          " \n".format(self.temperature))
+            self.sf.write('tran tran step={} stop={}n ic=node write=spectre.dc errpreset=moderate '
+                          ' annotate=status maxiters=5 \n'.format("5p", end_time))
+            self.sf.write("simulator lang=spice\n")
         else:
+            self.sf.write(".TRAN 5p {0}n \n".format(end_time))
             self.sf.write(".OPTIONS POST=1 RUNLVL={0} PROBE\n".format(runlvl))
+            if OPTS.spice_name == "hspice":  # for cadence plots
+                self.sf.write(".OPTIONS PSF=1 \n")
+                self.sf.write(".OPTIONS HIER_DELIM=1 \n")
 
         # create plots for all signals
         self.sf.write("* probe is used for hspice/xa, while plot is used in ngspice\n")
@@ -314,6 +337,16 @@ class stimuli():
                                                                  OPTS.openram_temp,
                                                                  OPTS.num_sim_threads)
             valid_retcode=0
+        elif OPTS.spice_name == "spectre":
+            if OPTS.use_pex:
+                extra_options = " +dcopt +postlayout "
+            else:
+                extra_options = ""
+            cmd = ("{0} -64 {1} -format psfbin -raw {2} {3} -maxwarnstolog 1000 "
+                   " +mt={4} -maxnotestolog 1000 "
+                   .format(OPTS.spice_exe, temp_stim, OPTS.openram_temp, extra_options,
+                           OPTS.num_sim_threads))
+            valid_retcode = 0
         elif OPTS.spice_name == "hspice":
             # TODO: Should make multithreading parameter a configuration option
             cmd = "{0} -mt {1} -i {2} -o {3}timing".format(OPTS.spice_exe,