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Use pand2 of correct size. Simplify width checking of AND array.

This commit is contained in:
Matt Guthaus 2019-08-21 11:20:35 -07:00
parent c39b09c736
commit 2b7025335c
3 changed files with 7 additions and 13 deletions
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17
compiler/modules/write_mask_and_array.py
View File

@ -63,8 +63,9 @@ class write_mask_and_array(design.design):
def add_modules(self): def add_modules(self):
# Size the AND gate for the number of write drivers it drives, which is equal to the write size. # Size the AND gate for the number of write drivers it drives, which is equal to the write size.
# Assume stage effort of 3 to compute the size
self.and2 = factory.create(module_type="pand2", self.and2 = factory.create(module_type="pand2",
size=self.write_size) size=self.write_size/4.0)
self.add_mod(self.and2) self.add_mod(self.and2)
@ -92,18 +93,12 @@ class write_mask_and_array(design.design):
else: else:
self.driver_spacing = self.driver.width self.driver_spacing = self.driver.width
if (self.words_per_row == 1): self.wmask_en_len = self.words_per_row * (self.write_size * self.driver_spacing)
wmask_en_len = (self.write_size * self.driver_spacing) debug.check(self.wmask_en_len >= self.and2.width,
if self.driver_spacing * self.write_size < self.and2.width: "Write mask AND is wider than the corresponding write drivers {0} vs {1}.".format(self.and2.width,self.wmask_en_len))
debug.error("Cannot layout write mask AND array. One pand2 is longer than the corresponding write drivers.")
else:
wmask_en_len = self.words_per_row * (self.write_size * self.driver_spacing)
if wmask_en_len < self.and2.width:
debug.error("Cannot layout write mask AND array. One pand2 is longer than the corresponding write drivers.")
self.wmask_en_len = wmask_en_len
for i in range(self.num_wmasks): for i in range(self.num_wmasks):
base = vector(i * wmask_en_len, 0) base = vector(i * self.wmask_en_len, 0)
self.and2_insts[i].place(base) self.and2_insts[i].place(base)

1
compiler/pgates/pand2.py
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@ -36,7 +36,6 @@ class pand2(pgate.pgate):
self.nand = factory.create(module_type="pnand2",height=self.height) self.nand = factory.create(module_type="pnand2",height=self.height)
self.add_mod(self.nand) self.add_mod(self.nand)
# Assume stage effort of 3
self.inv = factory.create(module_type="pdriver", neg_polarity=True, fanout=3*self.size, height=self.height) self.inv = factory.create(module_type="pdriver", neg_polarity=True, fanout=3*self.size, height=self.height)
self.add_mod(self.inv) self.add_mod(self.inv)

2
compiler/pgates/pdriver.py
View File

@ -45,7 +45,7 @@ class pdriver(pgate.pgate):
self.num_stages = len(self.size_list) self.num_stages = len(self.size_list)
else: else:
# Find the optimal number of stages for the given effort # Find the optimal number of stages for the given effort
self.num_stages = max(1,int(round(log(self.fanout)/log(self.stage_effort)))) self.num_stages = max(1,int(round(self.fanout**(1/self.stage_effort))))
# Increase the number of stages if we need to fix polarity # Increase the number of stages if we need to fix polarity
if self.neg_polarity and (self.num_stages%2==0): if self.neg_polarity and (self.num_stages%2==0):