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Initial pex sram test.

This commit is contained in:
mrg 2020-10-02 13:32:52 -07:00
parent b32c123dab
commit 1e24b780bb
6 changed files with 128 additions and 134 deletions
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130
compiler/characterizer/delay.py
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@ -56,8 +56,14 @@ class delay(simulation):
""" Create measurement names. The names themselves currently define the type of measurement """ """ Create measurement names. The names themselves currently define the type of measurement """
self.delay_meas_names = ["delay_lh", "delay_hl", "slew_lh", "slew_hl"] self.delay_meas_names = ["delay_lh", "delay_hl", "slew_lh", "slew_hl"]
self.power_meas_names = ["read0_power", "read1_power", "write0_power", "write1_power", self.power_meas_names = ["read0_power",
"disabled_read0_power", "disabled_read1_power", "disabled_write0_power", "disabled_write1_power"] "read1_power",
"write0_power",
"write1_power",
"disabled_read0_power",
"disabled_read1_power",
"disabled_write0_power",
"disabled_write1_power"]
# self.voltage_when_names = ["volt_bl", "volt_br"] # self.voltage_when_names = ["volt_bl", "volt_br"]
# self.bitline_delay_names = ["delay_bl", "delay_br"] # self.bitline_delay_names = ["delay_bl", "delay_br"]
@ -179,7 +185,7 @@ class delay(simulation):
self.dout_volt_meas[-1].meta_str = meas.meta_str self.dout_volt_meas[-1].meta_str = meas.meta_str
if not OPTS.use_pex: if not OPTS.use_pex:
self.sen_meas = delay_measure("delay_sen", self.clk_frmt, self.sen_name+"{}", "FALL", "RISE", measure_scale=1e9) self.sen_meas = delay_measure("delay_sen", self.clk_frmt, self.sen_name + "{}", "FALL", "RISE", measure_scale=1e9)
else: else:
self.sen_meas = delay_measure("delay_sen", self.clk_frmt, self.sen_name, "FALL", "RISE", measure_scale=1e9) self.sen_meas = delay_measure("delay_sen", self.clk_frmt, self.sen_name, "FALL", "RISE", measure_scale=1e9)
@ -191,12 +197,12 @@ class delay(simulation):
def create_read_bit_measures(self): def create_read_bit_measures(self):
""" Adds bit measurements for read0 and read1 cycles """ """ Adds bit measurements for read0 and read1 cycles """
self.read_bit_meas = {bit_polarity.NONINVERTING:[], bit_polarity.INVERTING:[]} self.read_bit_meas = {bit_polarity.NONINVERTING: [], bit_polarity.INVERTING: []}
meas_cycles = (sram_op.READ_ZERO, sram_op.READ_ONE) meas_cycles = (sram_op.READ_ZERO, sram_op.READ_ONE)
for cycle in meas_cycles: for cycle in meas_cycles:
meas_tag = "a{}_b{}_{}".format(self.probe_address, self.probe_data, cycle.name) meas_tag = "a{}_b{}_{}".format(self.probe_address, self.probe_data, cycle.name)
single_bit_meas = self.get_bit_measures(meas_tag, self.probe_address, self.probe_data) single_bit_meas = self.get_bit_measures(meas_tag, self.probe_address, self.probe_data)
for polarity,meas in single_bit_meas.items(): for polarity, meas in single_bit_meas.items():
meas.meta_str = cycle meas.meta_str = cycle
self.read_bit_meas[polarity].append(meas) self.read_bit_meas[polarity].append(meas)
# Dictionary values are lists, reduce to a single list of measurements # Dictionary values are lists, reduce to a single list of measurements
@ -205,12 +211,12 @@ class delay(simulation):
def create_write_bit_measures(self): def create_write_bit_measures(self):
""" Adds bit measurements for write0 and write1 cycles """ """ Adds bit measurements for write0 and write1 cycles """
self.write_bit_meas = {bit_polarity.NONINVERTING:[], bit_polarity.INVERTING:[]} self.write_bit_meas = {bit_polarity.NONINVERTING: [], bit_polarity.INVERTING: []}
meas_cycles = (sram_op.WRITE_ZERO, sram_op.WRITE_ONE) meas_cycles = (sram_op.WRITE_ZERO, sram_op.WRITE_ONE)
for cycle in meas_cycles: for cycle in meas_cycles:
meas_tag = "a{}_b{}_{}".format(self.probe_address, self.probe_data, cycle.name) meas_tag = "a{}_b{}_{}".format(self.probe_address, self.probe_data, cycle.name)
single_bit_meas = self.get_bit_measures(meas_tag, self.probe_address, self.probe_data) single_bit_meas = self.get_bit_measures(meas_tag, self.probe_address, self.probe_data)
for polarity,meas in single_bit_meas.items(): for polarity, meas in single_bit_meas.items():
meas.meta_str = cycle meas.meta_str = cycle
self.write_bit_meas[polarity].append(meas) self.write_bit_meas[polarity].append(meas)
# Dictionary values are lists, reduce to a single list of measurements # Dictionary values are lists, reduce to a single list of measurements
@ -279,12 +285,8 @@ class delay(simulation):
# instantiate the sram # instantiate the sram
self.sf.write("\n* Instantiation of the SRAM\n") self.sf.write("\n* Instantiation of the SRAM\n")
if not OPTS.use_pex:
self.stim.inst_model(pins=self.pins, self.stim.inst_model(pins=self.pins,
model_name=self.sram.name) model_name=self.sram.name)
else:
self.stim.inst_sram_pex(pins=self.pins,
model_name=self.sram.name)
self.sf.write("\n* SRAM output loads\n") self.sf.write("\n* SRAM output loads\n")
for port in self.read_ports: for port in self.read_ports:
@ -320,7 +322,6 @@ class delay(simulation):
self.gen_data() self.gen_data()
self.gen_addr() self.gen_addr()
# generate control signals # generate control signals
self.sf.write("\n* Generation of control signals\n") self.sf.write("\n* Generation of control signals\n")
self.gen_control() self.gen_control()
@ -433,7 +434,7 @@ class delay(simulation):
# These measurements have there time further delayed to the neg. edge of the clock. # These measurements have there time further delayed to the neg. edge of the clock.
if delay_obj.meta_add_delay: if delay_obj.meta_add_delay:
meas_cycle_delay += self.period/2 meas_cycle_delay += self.period / 2
return (meas_cycle_delay, meas_cycle_delay, self.vdd_voltage, port) return (meas_cycle_delay, meas_cycle_delay, self.vdd_voltage, port)
@ -442,7 +443,7 @@ class delay(simulation):
# Return value is intended to match the power measure format: t_initial, t_final, port # Return value is intended to match the power measure format: t_initial, t_final, port
t_initial = self.cycle_times[self.measure_cycles[port][power_obj.meta_str]] t_initial = self.cycle_times[self.measure_cycles[port][power_obj.meta_str]]
t_final = self.cycle_times[self.measure_cycles[port][power_obj.meta_str]+1] t_final = self.cycle_times[self.measure_cycles[port][power_obj.meta_str] + 1]
return (t_initial, t_final, port) return (t_initial, t_final, port)
@ -455,7 +456,7 @@ class delay(simulation):
# Measurement occurs slightly into the next period so we know that the value # Measurement occurs slightly into the next period so we know that the value
# "stuck" after the end of the period -> current period start + 1.25*period # "stuck" after the end of the period -> current period start + 1.25*period
at_time = meas_cycle+1.25*self.period at_time = meas_cycle + 1.25 * self.period
return (at_time, port) return (at_time, port)
@ -465,7 +466,7 @@ class delay(simulation):
""" """
# Only checking 0 value reads for now. # Only checking 0 value reads for now.
t_trig = meas_cycle_delay = self.cycle_times[self.measure_cycles[port][sram_op.READ_ZERO]] t_trig = self.cycle_times[self.measure_cycles[port][sram_op.READ_ZERO]]
return (t_trig, self.vdd_voltage, port) return (t_trig, self.vdd_voltage, port)
@ -480,7 +481,6 @@ class delay(simulation):
measure_variant_inp_tuple = self.get_measure_variants(port, measure, "read") measure_variant_inp_tuple = self.get_measure_variants(port, measure, "read")
measure.write_measure(self.stim, measure_variant_inp_tuple) measure.write_measure(self.stim, measure_variant_inp_tuple)
def write_delay_measures_write_port(self, port): def write_delay_measures_write_port(self, port):
""" """
Write the measure statements to quantify the power results for a write port. Write the measure statements to quantify the power results for a write port.
@ -513,7 +513,6 @@ class delay(simulation):
self.sf.write("* Write ports {}\n".format(write_port)) self.sf.write("* Write ports {}\n".format(write_port))
self.write_delay_measures_write_port(write_port) self.write_delay_measures_write_port(write_port)
def write_power_measures(self): def write_power_measures(self):
""" """
Write the measure statements to quantify the leakage power only. Write the measure statements to quantify the leakage power only.
@ -523,7 +522,7 @@ class delay(simulation):
# add measure statements for power # add measure statements for power
t_initial = self.period t_initial = self.period
t_final = 2*self.period t_final = 2 * self.period
self.stim.gen_meas_power(meas_name="leakage_power", self.stim.gen_meas_power(meas_name="leakage_power",
t_initial=t_initial, t_initial=t_initial,
t_final=t_final) t_final=t_final)
@ -543,7 +542,7 @@ class delay(simulation):
while True: while True:
time_out -= 1 time_out -= 1
if (time_out <= 0): if (time_out <= 0):
debug.error("Timed out, could not find a feasible period.",2) debug.error("Timed out, could not find a feasible period.", 2)
# Write ports are assumed non-critical to timing, so the first available is used # Write ports are assumed non-critical to timing, so the first available is used
self.targ_write_ports = [self.write_ports[0]] self.targ_write_ports = [self.write_ports[0]]
@ -589,7 +588,6 @@ class delay(simulation):
feasible_delays[self.read_ports[0]] = self.find_feasible_period_one_port(self.read_ports[0]) feasible_delays[self.read_ports[0]] = self.find_feasible_period_one_port(self.read_ports[0])
previous_period = self.period previous_period = self.period
# Loops through all the ports checks if the feasible period works. Everything restarts it if does not. # Loops through all the ports checks if the feasible period works. Everything restarts it if does not.
# Write ports do not produce delays which is why they are not included here. # Write ports do not produce delays which is why they are not included here.
i = 1 i = 1
@ -630,7 +628,7 @@ class delay(simulation):
for port in self.targ_write_ports: for port in self.targ_write_ports:
if not self.check_bit_measures(self.write_bit_meas, port): if not self.check_bit_measures(self.write_bit_meas, port):
return(False,{}) return(False, {})
debug.info(2, "Checking write values for port {}".format(port)) debug.info(2, "Checking write values for port {}".format(port))
write_port_dict = {} write_port_dict = {}
@ -638,22 +636,21 @@ class delay(simulation):
write_port_dict[measure.name] = measure.retrieve_measure(port=port) write_port_dict[measure.name] = measure.retrieve_measure(port=port)
if not check_dict_values_is_float(write_port_dict): if not check_dict_values_is_float(write_port_dict):
debug.error("Failed to Measure Write Port Values:\n\t\t{0}".format(write_port_dict),1) debug.error("Failed to Measure Write Port Values:\n\t\t{0}".format(write_port_dict), 1)
result[port].update(write_port_dict) result[port].update(write_port_dict)
for port in self.targ_read_ports: for port in self.targ_read_ports:
# First, check that the memory has the right values at the right times # First, check that the memory has the right values at the right times
if not self.check_bit_measures(self.read_bit_meas, port): if not self.check_bit_measures(self.read_bit_meas, port):
return(False,{}) return(False, {})
debug.info(2, "Checking read delay values for port {}".format(port)) debug.info(2, "Checking read delay values for port {}".format(port))
# Check sen timing, then bitlines, then general measurements. # Check sen timing, then bitlines, then general measurements.
if not self.check_sen_measure(port): if not self.check_sen_measure(port):
return (False,{}) return (False, {})
if not self.check_read_debug_measures(port): if not self.check_read_debug_measures(port):
return (False,{}) return (False, {})
# Check timing for read ports. Power is only checked if it was read correctly # Check timing for read ports. Power is only checked if it was read correctly
read_port_dict = {} read_port_dict = {}
@ -661,27 +658,26 @@ class delay(simulation):
read_port_dict[measure.name] = measure.retrieve_measure(port=port) read_port_dict[measure.name] = measure.retrieve_measure(port=port)
if not self.check_valid_delays(read_port_dict): if not self.check_valid_delays(read_port_dict):
return (False,{}) return (False, {})
if not check_dict_values_is_float(read_port_dict): if not check_dict_values_is_float(read_port_dict):
debug.error("Failed to Measure Read Port Values:\n\t\t{0}".format(read_port_dict),1) debug.error("Failed to Measure Read Port Values:\n\t\t{0}".format(read_port_dict), 1)
result[port].update(read_port_dict) result[port].update(read_port_dict)
return (True,result) return (True, result)
def check_sen_measure(self, port): def check_sen_measure(self, port):
"""Checks that the sen occurred within a half-period""" """Checks that the sen occurred within a half-period"""
sen_val = self.sen_meas.retrieve_measure(port=port) sen_val = self.sen_meas.retrieve_measure(port=port)
debug.info(2,"s_en delay={}ns".format(sen_val)) debug.info(2, "s_en delay={}ns".format(sen_val))
if self.sen_meas.meta_add_delay: if self.sen_meas.meta_add_delay:
max_delay = self.period/2 max_delay = self.period / 2
else: else:
max_delay = self.period max_delay = self.period
return not (type(sen_val) != float or sen_val > max_delay) return not (type(sen_val) != float or sen_val > max_delay)
def check_read_debug_measures(self, port): def check_read_debug_measures(self, port):
"""Debug measures that indicate special conditions.""" """Debug measures that indicate special conditions."""
@ -697,20 +693,20 @@ class delay(simulation):
elif self.br_name == meas.targ_name_no_port: elif self.br_name == meas.targ_name_no_port:
br_vals[meas.meta_str] = val br_vals[meas.meta_str] = val
debug.info(2,"{}={}".format(meas.name,val)) debug.info(2, "{}={}".format(meas.name, val))
dout_success = True dout_success = True
bl_success = False bl_success = False
for meas in self.dout_volt_meas: for meas in self.dout_volt_meas:
val = meas.retrieve_measure(port=port) val = meas.retrieve_measure(port=port)
debug.info(2,"{}={}".format(meas.name, val)) debug.info(2, "{}={}".format(meas.name, val))
debug.check(type(val)==float, "Error retrieving numeric measurement: {0} {1}".format(meas.name,val)) debug.check(type(val)==float, "Error retrieving numeric measurement: {0} {1}".format(meas.name, val))
if meas.meta_str == sram_op.READ_ONE and val < self.vdd_voltage*0.1: if meas.meta_str == sram_op.READ_ONE and val < self.vdd_voltage * 0.1:
dout_success = False dout_success = False
debug.info(1, "Debug measurement failed. Value {}V was read on read 1 cycle.".format(val)) debug.info(1, "Debug measurement failed. Value {}V was read on read 1 cycle.".format(val))
bl_success = self.check_bitline_meas(bl_vals[sram_op.READ_ONE], br_vals[sram_op.READ_ONE]) bl_success = self.check_bitline_meas(bl_vals[sram_op.READ_ONE], br_vals[sram_op.READ_ONE])
elif meas.meta_str == sram_op.READ_ZERO and val > self.vdd_voltage*0.9: elif meas.meta_str == sram_op.READ_ZERO and val > self.vdd_voltage * 0.9:
dout_success = False dout_success = False
debug.info(1, "Debug measurement failed. Value {}V was read on read 0 cycle.".format(val)) debug.info(1, "Debug measurement failed. Value {}V was read on read 0 cycle.".format(val))
bl_success = self.check_bitline_meas(br_vals[sram_op.READ_ONE], bl_vals[sram_op.READ_ONE]) bl_success = self.check_bitline_meas(br_vals[sram_op.READ_ONE], bl_vals[sram_op.READ_ONE])
@ -718,11 +714,10 @@ class delay(simulation):
# If the bitlines have a correct value while the output does not then that is a # If the bitlines have a correct value while the output does not then that is a
# sen error. FIXME: there are other checks that can be done to solidfy this conclusion. # sen error. FIXME: there are other checks that can be done to solidfy this conclusion.
if not dout_success and bl_success: if not dout_success and bl_success:
debug.error("Sense amp enable timing error. Increase the delay chain through the configuration file.",1) debug.error("Sense amp enable timing error. Increase the delay chain through the configuration file.", 1)
return dout_success return dout_success
def check_bit_measures(self, bit_measures, port): def check_bit_measures(self, bit_measures, port):
""" """
Checks the measurements which represent the internal storage voltages Checks the measurements which represent the internal storage voltages
@ -732,27 +727,27 @@ class delay(simulation):
for polarity, meas_list in bit_measures.items(): for polarity, meas_list in bit_measures.items():
for meas in meas_list: for meas in meas_list:
val = meas.retrieve_measure(port=port) val = meas.retrieve_measure(port=port)
debug.info(2,"{}={}".format(meas.name, val)) debug.info(2, "{}={}".format(meas.name, val))
if type(val) != float: if type(val) != float:
continue continue
meas_cycle = meas.meta_str meas_cycle = meas.meta_str
# Loose error conditions. Assume it's not metastable but account for noise during reads. # Loose error conditions. Assume it's not metastable but account for noise during reads.
if (meas_cycle == sram_op.READ_ZERO and polarity == bit_polarity.NONINVERTING) or\ if (meas_cycle == sram_op.READ_ZERO and polarity == bit_polarity.NONINVERTING) or\
(meas_cycle == sram_op.READ_ONE and polarity == bit_polarity.INVERTING): (meas_cycle == sram_op.READ_ONE and polarity == bit_polarity.INVERTING):
success = val < self.vdd_voltage/2 success = val < self.vdd_voltage / 2
elif (meas_cycle == sram_op.READ_ZERO and polarity == bit_polarity.INVERTING) or\ elif (meas_cycle == sram_op.READ_ZERO and polarity == bit_polarity.INVERTING) or\
(meas_cycle == sram_op.READ_ONE and polarity == bit_polarity.NONINVERTING): (meas_cycle == sram_op.READ_ONE and polarity == bit_polarity.NONINVERTING):
success = val > self.vdd_voltage/2 success = val > self.vdd_voltage / 2
elif (meas_cycle == sram_op.WRITE_ZERO and polarity == bit_polarity.INVERTING) or\ elif (meas_cycle == sram_op.WRITE_ZERO and polarity == bit_polarity.INVERTING) or\
(meas_cycle == sram_op.WRITE_ONE and polarity == bit_polarity.NONINVERTING): (meas_cycle == sram_op.WRITE_ONE and polarity == bit_polarity.NONINVERTING):
success = val > self.vdd_voltage/2 success = val > self.vdd_voltage / 2
elif (meas_cycle == sram_op.WRITE_ONE and polarity == bit_polarity.INVERTING) or\ elif (meas_cycle == sram_op.WRITE_ONE and polarity == bit_polarity.INVERTING) or\
(meas_cycle == sram_op.WRITE_ZERO and polarity == bit_polarity.NONINVERTING): (meas_cycle == sram_op.WRITE_ZERO and polarity == bit_polarity.NONINVERTING):
success = val < self.vdd_voltage/2 success = val < self.vdd_voltage / 2
if not success: if not success:
debug.info(1,("Wrong value detected on probe bit during read/write cycle. " debug.info(1, ("Wrong value detected on probe bit during read/write cycle. "
"Check writes and control logic for bugs.\n measure={}, op={}, " "Check writes and control logic for bugs.\n measure={}, op={}, "
"bit_storage={}, V(bit)={}").format(meas.name, meas_cycle.name, polarity.name,val)) "bit_storage={}, V(bit)={}").format(meas.name, meas_cycle.name, polarity.name, val))
return success return success
@ -764,10 +759,10 @@ class delay(simulation):
# The inputs looks at discharge/charged bitline rather than left or right (bl/br) # The inputs looks at discharge/charged bitline rather than left or right (bl/br)
# Performs two checks, discharging bitline is at least 10% away from vdd and there is a # Performs two checks, discharging bitline is at least 10% away from vdd and there is a
# 10% vdd difference between the bitlines. Both need to fail to be considered a s_en error. # 10% vdd difference between the bitlines. Both need to fail to be considered a s_en error.
min_dicharge = v_discharged_bl < self.vdd_voltage*0.9 min_dicharge = v_discharged_bl < self.vdd_voltage * 0.9
min_diff = (v_charged_bl - v_discharged_bl) > self.vdd_voltage*0.1 min_diff = (v_charged_bl - v_discharged_bl) > self.vdd_voltage * 0.1
debug.info(1,"min_dicharge={}, min_diff={}".format(min_dicharge,min_diff)) debug.info(1, "min_dicharge={}, min_diff={}".format(min_dicharge, min_diff))
return (min_dicharge and min_diff) return (min_dicharge and min_diff)
def run_power_simulation(self): def run_power_simulation(self):
@ -779,20 +774,20 @@ class delay(simulation):
self.write_power_stimulus(trim=False) self.write_power_stimulus(trim=False)
self.stim.run_sim() self.stim.run_sim()
leakage_power=parse_spice_list("timing", "leakage_power") leakage_power=parse_spice_list("timing", "leakage_power")
debug.check(leakage_power!="Failed","Could not measure leakage power.") debug.check(leakage_power!="Failed", "Could not measure leakage power.")
debug.info(1, "Leakage power of full array is {0} mW".format(leakage_power*1e3)) debug.info(1, "Leakage power of full array is {0} mW".format(leakage_power * 1e3))
# debug # debug
# sys.exit(1) # sys.exit(1)
self.write_power_stimulus(trim=True) self.write_power_stimulus(trim=True)
self.stim.run_sim() self.stim.run_sim()
trim_leakage_power=parse_spice_list("timing", "leakage_power") trim_leakage_power=parse_spice_list("timing", "leakage_power")
debug.check(trim_leakage_power!="Failed","Could not measure leakage power.") debug.check(trim_leakage_power!="Failed", "Could not measure leakage power.")
debug.info(1, "Leakage power of trimmed array is {0} mW".format(trim_leakage_power*1e3)) debug.info(1, "Leakage power of trimmed array is {0} mW".format(trim_leakage_power * 1e3))
# For debug, you sometimes want to inspect each simulation. # For debug, you sometimes want to inspect each simulation.
# key=raw_input("press return to continue") # key=raw_input("press return to continue")
return (leakage_power*1e3, trim_leakage_power*1e3) return (leakage_power * 1e3, trim_leakage_power * 1e3)
def check_valid_delays(self, result_dict): def check_valid_delays(self, result_dict):
""" Check if the measurements are defined and if they are valid. """ """ Check if the measurements are defined and if they are valid. """
@ -802,28 +797,29 @@ class delay(simulation):
delay_lh = result_dict["delay_lh"] delay_lh = result_dict["delay_lh"]
slew_hl = result_dict["slew_hl"] slew_hl = result_dict["slew_hl"]
slew_lh = result_dict["slew_lh"] slew_lh = result_dict["slew_lh"]
period_load_slew_str = "period {0} load {1} slew {2}".format(self.period,self.load, self.slew) period_load_slew_str = "period {0} load {1} slew {2}".format(self.period, self.load, self.slew)
# if it failed or the read was longer than a period # if it failed or the read was longer than a period
if type(delay_hl)!=float or type(delay_lh)!=float or type(slew_lh)!=float or type(slew_hl)!=float: if type(delay_hl)!=float or type(delay_lh)!=float or type(slew_lh)!=float or type(slew_hl)!=float:
delays_str = "delay_hl={0} delay_lh={1}".format(delay_hl, delay_lh) delays_str = "delay_hl={0} delay_lh={1}".format(delay_hl, delay_lh)
slews_str = "slew_hl={0} slew_lh={1}".format(slew_hl,slew_lh) slews_str = "slew_hl={0} slew_lh={1}".format(slew_hl, slew_lh)
debug.info(2,"Failed simulation (in sec):\n\t\t{0}\n\t\t{1}\n\t\t{2}".format(period_load_slew_str, debug.info(2, "Failed simulation (in sec):\n\t\t{0}\n\t\t{1}\n\t\t{2}".format(period_load_slew_str,
delays_str, delays_str,
slews_str)) slews_str))
return False return False
delays_str = "delay_hl={0} delay_lh={1}".format(delay_hl, delay_lh) delays_str = "delay_hl={0} delay_lh={1}".format(delay_hl, delay_lh)
slews_str = "slew_hl={0} slew_lh={1}".format(slew_hl,slew_lh) slews_str = "slew_hl={0} slew_lh={1}".format(slew_hl, slew_lh)
half_period = self.period/2 # high-to-low delays start at neg. clk edge, so they need to be less than half_period # high-to-low delays start at neg. clk edge, so they need to be less than half_period
half_period = self.period / 2
if abs(delay_hl)>half_period or abs(delay_lh)>self.period or abs(slew_hl)>half_period or abs(slew_lh)>self.period \ if abs(delay_hl)>half_period or abs(delay_lh)>self.period or abs(slew_hl)>half_period or abs(slew_lh)>self.period \
or delay_hl<0 or delay_lh<0 or slew_hl<0 or slew_lh<0: or delay_hl<0 or delay_lh<0 or slew_hl<0 or slew_lh<0:
debug.info(2,"UNsuccessful simulation (in ns):\n\t\t{0}\n\t\t{1}\n\t\t{2}".format(period_load_slew_str, debug.info(2, "UNsuccessful simulation (in ns):\n\t\t{0}\n\t\t{1}\n\t\t{2}".format(period_load_slew_str,
delays_str, delays_str,
slews_str)) slews_str))
return False return False
else: else:
debug.info(2,"Successful simulation (in ns):\n\t\t{0}\n\t\t{1}\n\t\t{2}".format(period_load_slew_str, debug.info(2, "Successful simulation (in ns):\n\t\t{0}\n\t\t{1}\n\t\t{2}".format(period_load_slew_str,
delays_str, delays_str,
slews_str)) slews_str))
@ -870,7 +866,7 @@ class delay(simulation):
while True: while True:
time_out -= 1 time_out -= 1
if (time_out <= 0): if (time_out <= 0):
debug.error("Timed out, could not converge on minimum period.",2) debug.error("Timed out, could not converge on minimum period.", 2)
self.period = target_period self.period = target_period
debug.info(1, "MinPeriod Search Port {3}: {0}ns (ub: {1} lb: {2})".format(target_period, debug.info(1, "MinPeriod Search Port {3}: {0}ns (ub: {1} lb: {2})".format(target_period,
@ -1077,7 +1073,6 @@ class delay(simulation):
data_ones = "1" * self.word_size data_ones = "1" * self.word_size
data_zeros = "0" * self.word_size data_zeros = "0" * self.word_size
wmask_ones = "1" * self.num_wmasks wmask_ones = "1" * self.num_wmasks
wmask_zeroes = "0" * self.num_wmasks
if self.t_current == 0: if self.t_current == 0:
self.add_noop_all_ports("Idle cycle (no positive clock edge)") self.add_noop_all_ports("Idle cycle (no positive clock edge)")
@ -1132,7 +1127,6 @@ class delay(simulation):
self.add_noop_clock_one_port(read_port) self.add_noop_clock_one_port(read_port)
self.measure_cycles[read_port]["disabled_read1"] = len(self.cycle_times) - 1 self.measure_cycles[read_port]["disabled_read1"] = len(self.cycle_times) - 1
# This also ensures we will have a L->H transition on the next read # This also ensures we will have a L->H transition on the next read
self.add_read("R data 0 address {} to clear dout caps".format(inverse_address), self.add_read("R data 0 address {} to clear dout caps".format(inverse_address),
inverse_address, inverse_address,
@ -1173,8 +1167,10 @@ class delay(simulation):
# Get any available read/write port in case only a single write or read ports is being characterized. # Get any available read/write port in case only a single write or read ports is being characterized.
cur_read_port = self.get_available_port(get_read_port=True) cur_read_port = self.get_available_port(get_read_port=True)
cur_write_port = self.get_available_port(get_read_port=False) cur_write_port = self.get_available_port(get_read_port=False)
debug.check(cur_read_port != None, "Characterizer requires at least 1 read port") debug.check(cur_read_port != None,
debug.check(cur_write_port != None, "Characterizer requires at least 1 write port") "Characterizer requires at least 1 read port")
debug.check(cur_write_port != None,
"Characterizer requires at least 1 write port")
# Create test cycles for specified target ports. # Create test cycles for specified target ports.
write_pos = 0 write_pos = 0

53
compiler/characterizer/stimuli.py
View File

@ -15,7 +15,6 @@ import tech
import debug import debug
import subprocess import subprocess
import os import os
import sys
import numpy as np import numpy as np
from globals import OPTS from globals import OPTS
@ -40,32 +39,26 @@ class stimuli():
debug.info(2, "Not using spice library") debug.info(2, "Not using spice library")
self.device_models = tech.spice["fet_models"][self.process] self.device_models = tech.spice["fet_models"][self.process]
self.sram_name = "Xsram"
def inst_sram(self, pins, inst_name):
""" Function to instatiate an SRAM subckt. """
self.sf.write("{} ".format(self.sram_name))
for pin in self.sram_pins:
self.sf.write("{0} ".format(pin))
self.sf.write("{0}\n".format(inst_name))
def inst_model(self, pins, model_name): def inst_model(self, pins, model_name):
""" Function to instantiate a generic model with a set of pins """ """ Function to instantiate a generic model with a set of pins """
if OPTS.use_pex:
self.inst_pex_model(pins, model_name)
else:
self.sf.write("X{0} ".format(model_name)) self.sf.write("X{0} ".format(model_name))
for pin in pins: for pin in pins:
self.sf.write("{0} ".format(pin)) self.sf.write("{0} ".format(pin))
self.sf.write("{0}\n".format(model_name)) self.sf.write("{0}\n".format(model_name))
def inst_sram_pex(self, pins, model_name): def inst_pex_model(self, pins, model_name):
self.sf.write("X{0} ".format(model_name)) self.sf.write("X{0} ".format(model_name))
for pin in pins: for pin in pins:
self.sf.write("{0} ".format(pin)) self.sf.write("{0} ".format(pin))
for bank in range(OPTS.num_banks): for bank in range(OPTS.num_banks):
row = int(OPTS.num_words / OPTS.words_per_row) - 1 row = int(OPTS.num_words / OPTS.words_per_row) - 1
col = int(OPTS.word_size * OPTS.words_per_row) - 1 col = int(OPTS.word_size * OPTS.words_per_row) - 1
self.sf.write("bitcell_Q_b{0}_r{1}_c{2} ".format(bank,row,col)) self.sf.write("bitcell_Q_b{0}_r{1}_c{2} ".format(bank, row, col))
self.sf.write("bitcell_Q_bar_b{0}_r{1}_c{2} ".format(bank,row,col)) self.sf.write("bitcell_Q_bar_b{0}_r{1}_c{2} ".format(bank, row, col))
# can't add all bitcells to top level due to ngspice max port count of 1005 # can't add all bitcells to top level due to ngspice max port count of 1005
# for row in range(int(OPTS.num_words / OPTS.words_per_row)): # for row in range(int(OPTS.num_words / OPTS.words_per_row)):
# for col in range(int(OPTS.word_size * OPTS.words_per_row)): # for col in range(int(OPTS.word_size * OPTS.words_per_row)):
@ -77,7 +70,6 @@ class stimuli():
self.sf.write("bl{0}_{1} ".format(port, col)) self.sf.write("bl{0}_{1} ".format(port, col))
self.sf.write("br{0}_{1} ".format(port, col)) self.sf.write("br{0}_{1} ".format(port, col))
self.sf.write("s_en{0} ".format(bank)) self.sf.write("s_en{0} ".format(bank))
self.sf.write("{0}\n".format(model_name)) self.sf.write("{0}\n".format(model_name))
@ -94,8 +86,7 @@ class stimuli():
self.tx_length)) self.tx_length))
self.sf.write(".ENDS test_inv\n") self.sf.write(".ENDS test_inv\n")
def create_buffer(self, buffer_name, size=[1, 3], beta=2.5):
def create_buffer(self, buffer_name, size=[1,3], beta=2.5):
""" """
Generates buffer for top level signals (only for sim Generates buffer for top level signals (only for sim
purposes). Size is pair for PMOS, NMOS width multiple. purposes). Size is pair for PMOS, NMOS width multiple.
@ -122,8 +113,6 @@ class stimuli():
self.tx_length)) self.tx_length))
self.sf.write(".ENDS test_{0}\n\n".format(buffer_name)) self.sf.write(".ENDS test_{0}\n\n".format(buffer_name))
def gen_pulse(self, sig_name, v1, v2, offset, period, t_rise, t_fall): def gen_pulse(self, sig_name, v1, v2, offset, period, t_rise, t_fall):
""" """
Generates a periodic signal with 50% duty cycle and slew rates. Period is measured Generates a periodic signal with 50% duty cycle and slew rates. Period is measured
@ -140,7 +129,6 @@ class stimuli():
0.5*period-0.5*t_rise-0.5*t_fall, 0.5*period-0.5*t_rise-0.5*t_fall,
period)) period))
def gen_pwl(self, sig_name, clk_times, data_values, period, slew, setup): def gen_pwl(self, sig_name, clk_times, data_values, period, slew, setup):
""" """
Generate a PWL stimulus given a signal name and data values at each period. Generate a PWL stimulus given a signal name and data values at each period.
@ -149,18 +137,22 @@ class stimuli():
to the initial value. to the initial value.
""" """
# the initial value is not a clock time # the initial value is not a clock time
debug.check(len(clk_times)==len(data_values),"Clock and data value lengths don't match. {0} clock values, {1} data values for {2}".format(len(clk_times), len(data_values), sig_name)) str = "Clock and data value lengths don't match. {0} clock values, {1} data values for {2}"
debug.check(len(clk_times)==len(data_values),
str.format(len(clk_times),
len(data_values),
sig_name))
# shift signal times earlier for setup time # shift signal times earlier for setup time
times = np.array(clk_times) - setup*period times = np.array(clk_times) - setup * period
values = np.array(data_values) * self.voltage values = np.array(data_values) * self.voltage
half_slew = 0.5 * slew half_slew = 0.5 * slew
self.sf.write("* (time, data): {}\n".format(list(zip(clk_times, data_values)))) self.sf.write("* (time, data): {}\n".format(list(zip(clk_times, data_values))))
self.sf.write("V{0} {0} 0 PWL (0n {1}v ".format(sig_name, values[0])) self.sf.write("V{0} {0} 0 PWL (0n {1}v ".format(sig_name, values[0]))
for i in range(1,len(times)): for i in range(1, len(times)):
self.sf.write("{0}n {1}v {2}n {3}v ".format(times[i]-half_slew, self.sf.write("{0}n {1}v {2}n {3}v ".format(times[i] - half_slew,
values[i-1], values[i - 1],
times[i]+half_slew, times[i] + half_slew,
values[i])) values[i]))
self.sf.write(")\n") self.sf.write(")\n")
@ -169,9 +161,9 @@ class stimuli():
self.sf.write("V{0} {0} 0 DC {1}\n".format(sig_name, v_val)) self.sf.write("V{0} {0} 0 DC {1}\n".format(sig_name, v_val))
def get_inverse_voltage(self, value): def get_inverse_voltage(self, value):
if value > 0.5*self.voltage: if value > 0.5 * self.voltage:
return 0 return 0
elif value <= 0.5*self.voltage: elif value <= 0.5 * self.voltage:
return self.voltage return self.voltage
else: else:
debug.error("Invalid value to get an inverse of: {0}".format(value)) debug.error("Invalid value to get an inverse of: {0}".format(value))
@ -184,7 +176,6 @@ class stimuli():
else: else:
debug.error("Invalid value to get an inverse of: {0}".format(value)) debug.error("Invalid value to get an inverse of: {0}".format(value))
def gen_meas_delay(self, meas_name, trig_name, targ_name, trig_val, targ_val, trig_dir, targ_dir, trig_td, targ_td): def gen_meas_delay(self, meas_name, trig_name, targ_name, trig_val, targ_val, trig_dir, targ_dir, trig_td, targ_td):
""" Creates the .meas statement for the measurement of delay """ """ Creates the .meas statement for the measurement of delay """
measure_string=".meas tran {0} TRIG v({1}) VAL={2} {3}=1 TD={4}n TARG v({5}) VAL={6} {7}=1 TD={8}n\n\n" measure_string=".meas tran {0} TRIG v({1}) VAL={2} {3}=1 TD={4}n TARG v({5}) VAL={6} {7}=1 TD={8}n\n\n"
@ -246,7 +237,7 @@ class stimuli():
timestep = 10 # ps, was 5ps but ngspice was complaining the timestep was too small in certain tests. timestep = 10 # ps, was 5ps but ngspice was complaining the timestep was too small in certain tests.
# UIC is needed for ngspice to converge # UIC is needed for ngspice to converge
self.sf.write(".TRAN {0}p {1}n UIC\n".format(timestep,end_time)) self.sf.write(".TRAN {0}p {1}n UIC\n".format(timestep, end_time))
self.sf.write(".TEMP {}\n".format(self.temperature)) self.sf.write(".TEMP {}\n".format(self.temperature))
if OPTS.spice_name == "ngspice": if OPTS.spice_name == "ngspice":
# ngspice sometimes has convergence problems if not using gear method # ngspice sometimes has convergence problems if not using gear method
@ -260,7 +251,7 @@ class stimuli():
# create plots for all signals # create plots for all signals
self.sf.write("* probe is used for hspice/xa, while plot is used in ngspice\n") self.sf.write("* probe is used for hspice/xa, while plot is used in ngspice\n")
if OPTS.debug_level>0: if OPTS.debug_level>0:
if OPTS.spice_name in ["hspice","xa"]: if OPTS.spice_name in ["hspice", "xa"]:
self.sf.write(".probe V(*)\n") self.sf.write(".probe V(*)\n")
else: else:
self.sf.write(".plot V(*)\n") self.sf.write(".plot V(*)\n")

4
compiler/sram/sram_base.py
View File

@ -94,7 +94,7 @@ class sram_base(design, verilog, lef):
# add pex labels for bitcells # add pex labels for bitcells
for bank_num in range(len(self.bank_insts)): for bank_num in range(len(self.bank_insts)):
bank = self.bank_insts[bank_num] bank = self.bank_insts[bank_num]
pex_data = bank.reverse_transformation_bitcell(bank.mod.bitcell.name) pex_data = bank.reverse_transformation_bitcell(self.bitcell.name)
bank_offset = pex_data[0] # offset bank relative to sram bank_offset = pex_data[0] # offset bank relative to sram
Q_offset = pex_data[1] # offset of storage relative to bank Q_offset = pex_data[1] # offset of storage relative to bank
@ -107,7 +107,7 @@ class sram_base(design, verilog, lef):
bl = [] bl = []
br = [] br = []
storage_layer_name = self.bitcell.get_pin("Q").layer storage_layer_name = "m1"
bitline_layer_name = self.bitcell.get_pin("bl").layer bitline_layer_name = self.bitcell.get_pin("bl").layer
for cell in range(len(bank_offset)): for cell in range(len(bank_offset)):

2
compiler/tests/testutils.py
View File

@ -83,6 +83,8 @@ class openram_test(unittest.TestCase):
tempspice = "{0}{1}.sp".format(OPTS.openram_temp, a.name) tempspice = "{0}{1}.sp".format(OPTS.openram_temp, a.name)
tempgds = "{0}{1}.gds".format(OPTS.openram_temp, a.name) tempgds = "{0}{1}.gds".format(OPTS.openram_temp, a.name)
a.gds_write(tempgds)
import verify import verify
result=verify.run_pex(a.name, tempgds, tempspice, output=output, final_verification=False) result=verify.run_pex(a.name, tempgds, tempspice, output=output, final_verification=False)
if result != 0: if result != 0:

5
compiler/verify/magic.py
View File

@ -406,6 +406,10 @@ def write_script_pex_rule(gds_name, cell_name, output):
else: else:
pre = "" pre = ""
f.write(pre + "extract\n") f.write(pre + "extract\n")
f.write(pre + "ext2sim labels on\n")
f.write(pre + "ext2sim\n")
f.write(pre + "extresist simplify off\n")
f.write(pre + "extresist all\n")
f.write(pre + "ext2spice hierarchy off\n") f.write(pre + "ext2spice hierarchy off\n")
f.write(pre + "ext2spice format ngspice\n") f.write(pre + "ext2spice format ngspice\n")
f.write(pre + "ext2spice renumber off\n") f.write(pre + "ext2spice renumber off\n")
@ -413,6 +417,7 @@ def write_script_pex_rule(gds_name, cell_name, output):
f.write(pre + "ext2spice blackbox on\n") f.write(pre + "ext2spice blackbox on\n")
f.write(pre + "ext2spice subcircuit top on\n") f.write(pre + "ext2spice subcircuit top on\n")
f.write(pre + "ext2spice global off\n") f.write(pre + "ext2spice global off\n")
f.write(pre + "ext2spice extresist on\n")
f.write(pre + "ext2spice {}\n".format(cell_name)) f.write(pre + "ext2spice {}\n".format(cell_name))
f.write("quit -noprompt\n") f.write("quit -noprompt\n")
f.write("eof\n") f.write("eof\n")