Replaced delay measure statement with object implementation.

compiler/characterizer/__init__.py

@@ -9,6 +9,7 @@ from .functional import *
 from .worst_case import *
 from .simulation import *
 from .bitline_delay import *
+from .measurements import *
 
 debug.info(1,"Initializing characterizer...")
 OPTS.spice_exe = ""

compiler/characterizer/delay.py

@@ -8,6 +8,7 @@ from .charutils import *
 import utils
 from globals import OPTS
 from .simulation import simulation
+from .measurements import *
 
 class delay(simulation):
     """Functions to measure the delay and power of an SRAM at a given address and
@@ -46,6 +47,16 @@ class delay(simulation):
         self.delay_meas_names = ["delay_lh", "delay_hl", "slew_lh", "slew_hl"]
         self.power_meas_names = ["read0_power", "read1_power", "write0_power", "write1_power"]
        
+    def create_measurement_objects(self):
+        self.meas_objs = []
+        trig_delay_name = "clk{0}"
+        targ_name = "{0}{1}_{2}".format(self.dout_name,"{}",self.probe_data) #Empty values are the port and probe data bit
+        self.meas_objs.append(delay_measure("delay_lh{}", trig_delay_name, targ_name, "RISE", "RISE"))
+        self.meas_objs.append(delay_measure("delay_hl{}", trig_delay_name, targ_name, "FALL", "FALL"))
+        
+        self.meas_objs.append(slew_measure("slew_lh{}", targ_name, "RISE"))
+        self.meas_objs.append(slew_measure("slew_hl{}", targ_name, "FALL"))
+        
     def create_signal_names(self):
         self.addr_name = "A"
         self.din_name = "DIN"
@@ -236,14 +247,27 @@ class delay(simulation):
             debug.error(1, "Measure command {0} not recognized".format(delay_name))
         return (meas_name,trig_name,targ_name,trig_val,targ_val,trig_dir,targ_dir,trig_td,targ_td)
        
+    def get_measure_variants(self, port, measure_obj):
+        """Get the measurement values that can either vary from simulation to simulation (vdd, address) or port to port (time delays)"""
+        #Return value is intended to match the delay measure format:  trig_td, targ_td, vdd, port
+        #vdd is arguably constant as that is true for a single lib file.
+        if measure_obj.targ_dir_str == "FALL":
+            meas_cycle_delay = self.cycle_times[self.measure_cycles[port]["read0"]]
+        elif measure_obj.targ_dir_str == "RISE":
+            meas_cycle_delay = self.cycle_times[self.measure_cycles[port]["read1"]]
+        else:
+            debug.error("Unrecognised measurement direction={}".format(measure_obj.targ_dir_str),1)
+            
+        return (meas_cycle_delay, meas_cycle_delay, self.vdd_voltage, port)
+        
     def write_delay_measures_read_port(self, port):
         """
         Write the measure statements to quantify the delay and power results for a read port.
         """
         # add measure statements for delays/slews
-        for dname in self.delay_meas_names:
-            meas_values = self.get_delay_meas_values(dname, port)
-            self.stim.gen_meas_delay(*meas_values)
+        for measure in self.meas_objs:
+            measure_variant_tuple = self.get_measure_variants(port, measure)
+            measure.write_measure(self.stim, measure_variant_tuple)
             
         # add measure statements for power
         for pname in self.power_meas_names:
@@ -645,6 +669,7 @@ class delay(simulation):
         char_sram_data = {}
         
         self.set_probe(probe_address, probe_data)
+        self.create_measurement_objects()
         
         self.load=max(loads)
         self.slew=max(slews)

compiler/characterizer/measurements.py

@@ -0,0 +1,92 @@
+import debug
+from tech import drc, parameter, spice
+from abc import ABC, abstractmethod
+from .stimuli import *
+
+class spice_measurement(ABC):
+    """Base class for spice stimulus measurements."""
+    def __init__(self, measure_name):
+        #Names must be unique for correct spice simulation, but not enforced here.
+        self.name = measure_name
+
+    @abstractmethod
+    def get_measure_function(self):
+        return None    
+        
+    @abstractmethod
+    def get_measure_values(self):
+        return None
+        
+    def write_measure(self, stim_obj, input_tuple):
+        measure_func = self.get_measure_function()
+        if measure_func == None:
+            debug.error("Did not set measure function",1)
+        measure_vals = self.get_measure_values(*input_tuple)
+        measure_func(stim_obj, *measure_vals)
+       
+           
+class delay_measure(spice_measurement):
+    """Generates a spice measurement for the delay of 50%-to-50% points of two signals."""
+    
+    def __init__(self, measure_name, trig_name, targ_name, trig_dir_str, targ_dir_str):
+        spice_measurement.__init__(self, measure_name)
+        self.set_meas_constants(trig_name, targ_name, trig_dir_str, targ_dir_str)
+    
+    def get_measure_function(self):
+        return stimuli.gen_meas_delay
+    
+    def set_meas_constants(self, trig_name, targ_name, trig_dir_str, targ_dir_str):
+        """Set the values needed to generate a Spice measurement statement based on the name of the measurement."""
+        self.trig_dir_str = trig_dir_str
+        self.targ_dir_str = targ_dir_str
+        
+        self.trig_val_of_vdd = 0.5 
+        self.targ_val_of_vdd = 0.5
+        
+        self.trig_name_no_port = trig_name
+        self.targ_name_no_port = targ_name
+        
+        #Time delays and ports are variant and needed as inputs when writing the measurement
+        
+    def get_measure_values(self, trig_td, targ_td, vdd_voltage, port=None):    
+        """Constructs inputs to stimulus measurement function. Variant values are inputs here."""
+        trig_val = self.trig_val_of_vdd * vdd_voltage
+        targ_val = self.targ_val_of_vdd * vdd_voltage
+        
+        if port != None:
+            meas_name = self.name.format(port)
+            trig_name = self.trig_name_no_port.format(port)
+            targ_name = self.targ_name_no_port.format(port)
+        else:
+            meas_name = self.name
+            trig_name = self.trig_name_no_port
+            targ_name = self.targ_name_no_port
+
+        return (meas_name,trig_name,targ_name,trig_val,targ_val,self.trig_dir_str,self.targ_dir_str,trig_td,targ_td)            
+ 
+ 
+class slew_measure(delay_measure):        
+    
+    def __init__(self, measure_name, signal_name, slew_dir_str):
+        spice_measurement.__init__(self, measure_name)
+        self.set_meas_constants(signal_name, slew_dir_str)
+    
+    def set_meas_constants(self, signal_name, slew_dir_str):
+        """Set the values needed to generate a Spice measurement statement based on the name of the measurement."""
+        self.trig_dir_str = slew_dir_str
+        self.targ_dir_str = slew_dir_str
+        
+        if slew_dir_str == "RISE":
+            self.trig_val_of_vdd = 0.1 
+            self.targ_val_of_vdd = 0.9
+        elif slew_dir_str == "FALL":
+            self.trig_val_of_vdd = 0.9 
+            self.targ_val_of_vdd = 0.1
+        else:
+            debug.error("Unrecognised slew measurement direction={}".format(slew_dir_str),1)
+        
+        self.trig_name_no_port = signal_name
+        self.targ_name_no_port = signal_name
+        
+        #Time delays and ports are variant and needed as inputs when writing the measurement 
+