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Limit wordline driver size. Place row addr dff near predecoders.

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mrg
2020-07-20 17:57:38 -07:00
parent 0ed81aa923
commit 58846a4a25
4 changed files with 17 additions and 15 deletions
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compiler/modules/hierarchical_decoder.py
+10 -11
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@@ -314,24 +314,23 @@ class hierarchical_decoder(design.design):
for i in range(self.no_of_pre3x8):
self.place_pre3x8(i)
self.predecode_height = 0
if self.no_of_pre2x4 > 0:
self.predecode_height = self.pre2x4_inst[-1].uy()
if self.no_of_pre3x8 > 0:
self.predecode_height = self.pre3x8_inst[-1].uy()
def place_pre2x4(self, num):
""" Place 2x4 predecoder to the left of the origin """
if (self.num_inputs == 2):
base = vector(-self.pre2_4.width, 0)
else:
base= vector(-self.pre2_4.width, num * (self.pre2_4.height + self.predecoder_spacing))
base= vector(-self.pre2_4.width, num * (self.pre2_4.height + self.predecoder_spacing))
self.pre2x4_inst[num].place(base)
def place_pre3x8(self, num):
""" Place 3x8 predecoder to the left of the origin and above any 2x4 decoders """
if (self.num_inputs == 3):
offset = vector(-self.pre_3_8.width, 0)
else:
height = self.no_of_pre2x4 * (self.pre2_4.height + self.predecoder_spacing) + num * (self.pre3_8.height + self.predecoder_spacing)
offset = vector(-self.pre3_8.width, height)
height = self.no_of_pre2x4 * (self.pre2_4.height + self.predecoder_spacing) \
+ num * (self.pre3_8.height + self.predecoder_spacing)
offset = vector(-self.pre3_8.width, height)
self.pre3x8_inst[num].place(offset)
def create_row_decoder(self):