mirror of https://github.com/VLSIDA/OpenRAM.git
Added corner case for 1 inv pos polarity and renamed variables.
This commit is contained in:
Jennifer Eve Sowash
parent
a6eec10f41
commit
a51aacfa90
|
|
@ -13,26 +13,26 @@ class pdriver(pgate.pgate):
|
|||
"""
|
||||
unique_id = 1
|
||||
|
||||
def __init__(self, height=None, name="", neg_polarity=False, c_load=8, size_list = []):
|
||||
def __init__(self, neg_polarity=False, fanout_size=8, size_list = [], height=None, name=""):
|
||||
|
||||
self.stage_effort = 4
|
||||
self.row_height = height
|
||||
self.height = height
|
||||
self.neg_polarity = neg_polarity
|
||||
self.size_list = size_list
|
||||
self.c_load = c_load
|
||||
self.fanout_size = fanout_size
|
||||
|
||||
if len(self.size_list) > 0 and (self.c_load != 8 or self.neg_polarity):
|
||||
raise Exception("Cannot specify both size_list and neg_polarity or c_load.")
|
||||
|
||||
self.compute_sizes()
|
||||
if len(self.size_list) > 0 and (self.fanout_size != 8 or self.neg_polarity):
|
||||
debug.error("Cannot specify both size_list and neg_polarity or fanout_size.", -1)
|
||||
|
||||
if name=="":
|
||||
name = "pdriver_{0}_{1}_".format(self.num_inv, pdriver.unique_id)
|
||||
name = "pdriver_{}".format(pdriver.unique_id)
|
||||
pdriver.unique_id += 1
|
||||
|
||||
pgate.pgate.__init__(self, name)
|
||||
debug.info(1, "Creating {}".format(self.name))
|
||||
|
||||
self.compute_sizes()
|
||||
|
||||
self.create_netlist()
|
||||
if not OPTS.netlist_only:
|
||||
self.create_layout()
|
||||
|
|
@ -45,8 +45,8 @@ class pdriver(pgate.pgate):
|
|||
self.num_inv = len(self.size_list)
|
||||
else:
|
||||
# find the number of stages
|
||||
#c_load is a unit inverter fanout, not a capacitance so c_in=1
|
||||
num_stages = int(round(log(self.c_load)/log(4)))
|
||||
#fanout_size is a unit inverter fanout, not a capacitance so c_in=1
|
||||
num_stages = max(1,int(round(log(self.fanout_size)/log(4))))
|
||||
|
||||
# find inv_num and compute sizes
|
||||
if self.neg_polarity:
|
||||
|
|
@ -65,30 +65,35 @@ class pdriver(pgate.pgate):
|
|||
self.calc_size_list = []
|
||||
self.num_inv = num_stages
|
||||
# compute sizes
|
||||
c_prev = self.c_load
|
||||
fanout_size_prev = self.fanout_size
|
||||
for x in range(self.num_inv-1,-1,-1):
|
||||
c_prev = int(round(c_prev/self.stage_effort))
|
||||
self.calc_size_list.append(c_prev)
|
||||
fanout_size_prev = int(round(fanout_size_prev/self.stage_effort))
|
||||
self.calc_size_list.append(fanout_size_prev)
|
||||
|
||||
|
||||
def diff_polarity(self, num_stages):
|
||||
self.calc_size_list = []
|
||||
# find which delay is smaller
|
||||
delay_below = ((num_stages-1)*(self.c_load**(1/num_stages-1))) + num_stages-1
|
||||
delay_above = ((num_stages+1)*(self.c_load**(1/num_stages+1))) + num_stages+1
|
||||
if (num_stages > 1):
|
||||
delay_below = ((num_stages-1)*(self.fanout_size**(1/num_stages-1))) + num_stages-1
|
||||
delay_above = ((num_stages+1)*(self.fanout_size**(1/num_stages+1))) + num_stages+1
|
||||
if (delay_above < delay_below):
|
||||
# recompute stage_effort for this delay
|
||||
self.num_inv = num_stages+1
|
||||
polarity_stage_effort = self.c_load**(1/self.num_inv)
|
||||
polarity_stage_effort = self.fanout_size**(1/self.num_inv)
|
||||
else:
|
||||
self.num_inv = num_stages-1
|
||||
polarity_stage_effort = self.c_load**(1/self.num_inv)
|
||||
polarity_stage_effort = self.fanout_size**(1/self.num_inv)
|
||||
else: # num_stages is 1, can't go to 0
|
||||
self.num_inv = num_stages+1
|
||||
polarity_stage_effort = self.fanout_size**(1/self.num_inv)
|
||||
|
||||
|
||||
# compute sizes
|
||||
c_prev = self.c_load
|
||||
fanout_size_prev = self.fanout_size
|
||||
for x in range(self.num_inv-1,-1,-1):
|
||||
c_prev = int(round(c_prev/polarity_stage_effort))
|
||||
self.calc_size_list.append(c_prev)
|
||||
fanout_size_prev = int(round(fanout_size_prev/polarity_stage_effort))
|
||||
self.calc_size_list.append(fanout_size_prev)
|
||||
|
||||
|
||||
def create_netlist(self):
|
||||
|
|
@ -118,11 +123,11 @@ class pdriver(pgate.pgate):
|
|||
self.inv_list = []
|
||||
if len(self.size_list) > 0: # size list specified
|
||||
for x in range(len(self.size_list)):
|
||||
self.inv_list.append(pinv(size=self.size_list[x], height=self.row_height))
|
||||
self.inv_list.append(pinv(size=self.size_list[x], height=self.height))
|
||||
self.add_mod(self.inv_list[x])
|
||||
else: # find inv sizes
|
||||
for x in range(len(self.calc_size_list)):
|
||||
self.inv_list.append(pinv(size=self.calc_size_list[x], height=self.row_height))
|
||||
self.inv_list.append(pinv(size=self.calc_size_list[x], height=self.height))
|
||||
self.add_mod(self.inv_list[x])
|
||||
|
||||
|
||||
|
|
|
|||
|
|
@ -11,6 +11,8 @@ import globals
|
|||
from globals import OPTS
|
||||
import debug
|
||||
|
||||
#os.system("chmod u+x 04_pdriver_test.py")
|
||||
|
||||
class pdriver_test(openram_test):
|
||||
|
||||
def runTest(self):
|
||||
|
|
@ -22,12 +24,12 @@ class pdriver_test(openram_test):
|
|||
|
||||
debug.info(2, "Testing inverter/buffer 4x 8x")
|
||||
# a tests the error message for specifying conflicting conditions
|
||||
#a = pdriver.pdriver(c_load = 4,size_list = [1,2,4,8])
|
||||
#a = pdriver.pdriver(fanout_size = 4,size_list = [1,2,4,8])
|
||||
b = pdriver.pdriver(size_list = [1,2,4,8])
|
||||
c = pdriver.pdriver(c_load = 50)
|
||||
d = pdriver.pdriver(c_load = 50, neg_polarity = True)
|
||||
e = pdriver.pdriver(c_load = 64)
|
||||
f = pdriver.pdriver(c_load = 64, neg_polarity = True)
|
||||
c = pdriver.pdriver(fanout_size = 50)
|
||||
d = pdriver.pdriver(fanout_size = 50, neg_polarity = True)
|
||||
e = pdriver.pdriver(fanout_size = 64)
|
||||
f = pdriver.pdriver(fanout_size = 64, neg_polarity = True)
|
||||
#self.local_check(a)
|
||||
self.local_check(b)
|
||||
self.local_check(c)
|
||||
|
|
|
|||
Loading…
Reference in New Issue