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Fix buggy analytical delay in pdriver

This commit is contained in:
Matt Guthaus 2019-01-25 16:22:59 -08:00
parent be7384c017
commit beceb3fb60
1 changed files with 20 additions and 14 deletions
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34
compiler/pgates/pdriver.py
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@ -203,22 +203,28 @@ class pdriver(pgate.pgate):
width = a_pin.width(),
height = a_pin.height())
def input_load(self):
return self.inv_list[0].input_load()
def analytical_delay(self, slew, load=0.0):
"""Calculate the analytical delay of INV1 -> ... -> INVn"""
delay = 0;
if len(self.inv_inst_list) == 1:
delay = self.inv_inst_list[x].analytical_delay(slew=slew);
else:
for x in range(len(self.inv_inst_list-1)):
load_next = 0.0
for n in range(x,len(self.inv_inst_list+1)):
load_next += self.inv_inst_list[x+1]
if x == 1:
delay += self.inv_inst_list[x].analytical_delay(slew=slew,
load=load_next)
else:
delay += self.inv_inst_list[x+1].analytical_delay(slew=delay.slew,
load=load_next)
cout_list = []
for prev_inv,inv in zip(self.inv_list, self.inv_list[1:]):
cout_list.append(inv.input_load())
cout_list.append(load)
input_slew = slew
delays = []
for inv,cout in zip(self.inv_list,cout_list):
delays.append(inv.analytical_delay(slew=input_slew, load=cout))
input_slew = delays[-1].slew
delay = delays[0]
for i in range(len(delays)-1):
delay += delays[i]
return delay