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Col decoders are anything not bitcell pitch.

This commit is contained in:
mrg 2020-06-25 14:25:48 -07:00
parent f84ee04fa9
commit 66df659ad4
2 changed files with 9 additions and 8 deletions
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6
compiler/modules/hierarchical_decoder.py
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@ -78,10 +78,12 @@ class hierarchical_decoder(design.design):
def add_decoders(self): def add_decoders(self):
""" Create the decoders based on the number of pre-decodes """ """ Create the decoders based on the number of pre-decodes """
self.pre2_4 = factory.create(module_type="hierarchical_predecode2x4") self.pre2_4 = factory.create(module_type="hierarchical_predecode2x4",
height=self.cell_height)
self.add_mod(self.pre2_4) self.add_mod(self.pre2_4)
self.pre3_8 = factory.create(module_type="hierarchical_predecode3x8") self.pre3_8 = factory.create(module_type="hierarchical_predecode3x8",
height=self.cell_height)
self.add_mod(self.pre3_8) self.add_mod(self.pre3_8)
def determine_predecodes(self, num_inputs): def determine_predecodes(self, num_inputs):

11
compiler/modules/hierarchical_predecode.py
View File

@ -24,12 +24,11 @@ class hierarchical_predecode(design.design):
if not height: if not height:
self.cell_height = b.height self.cell_height = b.height
self.column_decoder = False self.column_decoder = False
elif height != b.height:
self.cell_height = height
self.column_decoder = True
else: else:
self.cell_height = b.height self.cell_height = height
self.column_decoder = False # If we are pitch matched to the bitcell, it's a predecoder
# otherwise it's a column decoder (out of pgates)
self.column_decoder = (height != b.height)
self.number_of_outputs = int(math.pow(2, self.number_of_inputs)) self.number_of_outputs = int(math.pow(2, self.number_of_inputs))
design.design.__init__(self, name) design.design.__init__(self, name)
@ -311,7 +310,7 @@ class hierarchical_predecode(design.design):
""" Add a pin for each row of vdd/gnd which are must-connects next level up. """ """ Add a pin for each row of vdd/gnd which are must-connects next level up. """
# In sky130, we use hand-made decoder cells with vertical power # In sky130, we use hand-made decoder cells with vertical power
if not self.column_decoder: if OPTS.tech_name == "sky130" and not self.column_decoder:
for n in ["vdd", "gnd"]: for n in ["vdd", "gnd"]:
# This makes a wire from top to bottom for both inv and and gates # This makes a wire from top to bottom for both inv and and gates
for i in [self.inv_inst, self.and_inst]: for i in [self.inv_inst, self.and_inst]: