def write_measures(self, mode, correct_value, noise_margin, period):
""" Measure statements for setup/hold with right phases. """
if correct_value == vdd:
max_or_min = "MAX"
rise_or_fall = "RISE"
else:
max_or_min = "MIN"
rise_or_fall = "FALL"
incorrect_value = stimuli.get_inverse_value(correct_value)
self.sf.write("* Measure statements for pass/fail verification\n")
self.sf.write(".IC v({0})={1}\n".format(self.output_name,
incorrect_value))
#self.sf.write(".MEASURE TRAN {0}VOUT {0} v({1}) GOAL={2}\n".format(max_or_min, output_name, noise_margin))
# above is the old cmd for hspice, below is the one work for both
self.sf.write(
".MEASURE TRAN {0}VOUT {0} v({1}) from ={2}n to ={3}n\n".format(
max_or_min, self.output_name, 1.5 * period, 2 * period))
self.sf.write("\n")
def write_data(self, mode, target_time, correct_value):
"""Create the data signals for setup/hold analysis. First period is to
initialize it to the opposite polarity. Second period is used for
characterization.
"""
self.sf.write("\n* Generation of the data and clk signals\n")
incorrect_value = stimuli.get_inverse_value(correct_value)
if mode=="HOLD":
init_value = incorrect_value
start_value = correct_value
end_value = incorrect_value
else:
init_value = incorrect_value
start_value = incorrect_value
end_value = correct_value
stimuli.gen_pwl(stim_file=self.sf,
sig_name="data",
clk_times=[0, self.period, target_time],
data_values=[init_value, start_value, end_value],
period=target_time,
slew=self.constrained_input_slew,
setup=0)
def write_data(self, mode, period, target_time, correct_value):
""" Create the buffered data signals for setup/hold analysis """
self.sf.write("* Buffer for the DATA signal\n")
stimuli.add_buffer(stim_file=self.sf,
buffer_name="buffer",
signal_list=["DATA"])
self.sf.write("* Generation of the data and clk signals\n")
incorrect_value = stimuli.get_inverse_value(correct_value)
if mode == "HOLD":
start_value = correct_value
end_value = incorrect_value
else:
start_value = incorrect_value
end_value = correct_value
stimuli.gen_pulse(stim_file=self.sf,
sig_name="DATA",
v1=start_value,
v2=end_value,
offset=target_time,
period=2 * period,
t_rise=tech.spice["rise_time"],
t_fall=tech.spice["fall_time"])
self.sf.write("\n")