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Simplify m2 pitch calculation

This commit is contained in:
Matt Guthaus 2018-07-09 09:57:57 -07:00
parent a9a95ebf7c
commit af84742c19
1 changed files with 9 additions and 14 deletions
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19
compiler/modules/hierarchical_decoder.py
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@ -60,7 +60,6 @@ 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 """
# FIXME: Only add these if needed?
self.pre2_4 = pre2x4() self.pre2_4 = pre2x4()
self.add_mod(self.pre2_4) self.add_mod(self.pre2_4)
@ -90,11 +89,7 @@ class hierarchical_decoder(design.design):
debug.error("Invalid number of inputs for hierarchical decoder",-1) debug.error("Invalid number of inputs for hierarchical decoder",-1)
def setup_layout_constants(self): def setup_layout_constants(self):
# Vertical metal rail gap definition self.m2_pitch = contact.m2m3.height + max(self.m2_space,self.m3_space)
self.metal2_extend_contact = (contact.m1m2.second_layer_height - contact.m1m2.contact_width) / 2
self.metal2_spacing = self.metal2_extend_contact + self.m2_space
self.metal2_pitch = self.metal2_spacing + self.m2_width
self.via_shift = (contact.m1m2.second_layer_width - contact.m1m2.first_layer_width) / 2
self.predec_groups = [] # This array is a 2D array. self.predec_groups = [] # This array is a 2D array.
@ -143,10 +138,11 @@ class hierarchical_decoder(design.design):
debug.error("Not enough rows for a hierarchical decoder. Non-hierarchical not supported yet.",-1) debug.error("Not enough rows for a hierarchical decoder. Non-hierarchical not supported yet.",-1)
# Calculates height and width of pre-decoder, # Calculates height and width of pre-decoder,
if(self.no_of_pre3x8 > 0): if self.no_of_pre3x8 > 0:
self.predecoder_width = self.pre3_8.width self.predecoder_width = self.pre3_8.width
else: else:
self.predecoder_width = self.pre2_4.width self.predecoder_width = self.pre2_4.width
self.predecoder_height = self.pre2_4.height*self.no_of_pre2x4 + self.pre3_8.height*self.no_of_pre3x8 self.predecoder_height = self.pre2_4.height*self.no_of_pre2x4 + self.pre3_8.height*self.no_of_pre3x8
# Calculates height and width of row-decoder # Calculates height and width of row-decoder
@ -154,7 +150,7 @@ class hierarchical_decoder(design.design):
nand_width = self.nand2.width nand_width = self.nand2.width
else: else:
nand_width = self.nand3.width nand_width = self.nand3.width
self.routing_width = self.metal2_pitch*self.total_number_of_predecoder_outputs self.routing_width = self.m2_pitch*self.total_number_of_predecoder_outputs
self.row_decoder_height = self.inv.height * self.rows self.row_decoder_height = self.inv.height * self.rows
# Calculates height and width of hierarchical decoder # Calculates height and width of hierarchical decoder
@ -171,7 +167,7 @@ class hierarchical_decoder(design.design):
self.add_pre3x8(i) self.add_pre3x8(i)
def add_pre2x4(self,num): def add_pre2x4(self,num):
""" Add a 2x4 predecoder """ """ Add a 2x4 predecoder to the left of the origin """
if (self.num_inputs == 2): if (self.num_inputs == 2):
base = vector(-self.pre2_4.width,0) base = vector(-self.pre2_4.width,0)
@ -196,7 +192,6 @@ class hierarchical_decoder(design.design):
self.add_pre2x4_pins(num) self.add_pre2x4_pins(num)
def add_pre2x4_pins(self,num): def add_pre2x4_pins(self,num):
""" Add the input pins to the 2x4 predecoder """ """ Add the input pins to the 2x4 predecoder """
@ -213,7 +208,7 @@ class hierarchical_decoder(design.design):
def add_pre3x8(self,num): def add_pre3x8(self,num):
""" Add 3x8 numbered predecoder """ """ Add 3x8 predecoder to the left of the origin and above any 2x4 decoders """
if (self.num_inputs == 3): if (self.num_inputs == 3):
offset = vector(-self.pre_3_8.width,0) offset = vector(-self.pre_3_8.width,0)
mirror ="R0" mirror ="R0"
@ -388,7 +383,7 @@ class hierarchical_decoder(design.design):
for i in range(self.total_number_of_predecoder_outputs): for i in range(self.total_number_of_predecoder_outputs):
# The offsets go into the negative x direction # The offsets go into the negative x direction
# assuming the predecodes are placed at (self.routing_width,0) # assuming the predecodes are placed at (self.routing_width,0)
x_offset = self.metal2_pitch * i x_offset = self.m2_pitch * i
self.rail_x_offsets.append(x_offset+0.5*self.m2_width) self.rail_x_offsets.append(x_offset+0.5*self.m2_width)
self.add_rect(layer="metal2", self.add_rect(layer="metal2",
offset=vector(x_offset,0), offset=vector(x_offset,0),