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Remove inverter in wordline driver

This commit is contained in:
Matt Guthaus 2018-11-26 16:41:31 -08:00
parent 9e0b31d685
commit 21759d59b4
1 changed files with 7 additions and 28 deletions
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35
compiler/modules/wordline_driver.py
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@ -44,7 +44,7 @@ class wordline_driver(design.design):
# Outputs from wordline_driver. # Outputs from wordline_driver.
for i in range(self.rows): for i in range(self.rows):
self.add_pin("wl_{0}".format(i)) self.add_pin("wl_{0}".format(i))
self.add_pin("en") self.add_pin("en_bar")
self.add_pin("vdd") self.add_pin("vdd")
self.add_pin("gnd") self.add_pin("gnd")
@ -67,7 +67,7 @@ class wordline_driver(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. """
# Find the x offsets for where the vias/pins should be placed # Find the x offsets for where the vias/pins should be placed
a_xoffset = self.inv1_inst[0].rx() a_xoffset = self.nand_inst[0].rx()
b_xoffset = self.inv2_inst[0].lx() b_xoffset = self.inv2_inst[0].lx()
for num in range(self.rows): for num in range(self.rows):
# this will result in duplicate polygons for rails, but who cares # this will result in duplicate polygons for rails, but who cares
@ -95,24 +95,16 @@ class wordline_driver(design.design):
def create_drivers(self): def create_drivers(self):
self.inv1_inst = []
self.nand_inst = [] self.nand_inst = []
self.inv2_inst = [] self.inv2_inst = []
for row in range(self.rows): for row in range(self.rows):
name_inv1 = "wl_driver_inv_en{}".format(row)
name_nand = "wl_driver_nand{}".format(row) name_nand = "wl_driver_nand{}".format(row)
name_inv2 = "wl_driver_inv{}".format(row) name_inv2 = "wl_driver_inv{}".format(row)
# add inv1 based on the info above
self.inv1_inst.append(self.add_inst(name=name_inv1,
mod=self.inv_no_output))
self.connect_inst(["en",
"en_bar_{0}".format(row),
"vdd", "gnd"])
# add nand 2 # add nand 2
self.nand_inst.append(self.add_inst(name=name_nand, self.nand_inst.append(self.add_inst(name=name_nand,
mod=self.nand2)) mod=self.nand2))
self.connect_inst(["en_bar_{0}".format(row), self.connect_inst(["en_bar",
"in_{0}".format(row), "in_{0}".format(row),
"wl_bar_{0}".format(row), "wl_bar_{0}".format(row),
"vdd", "gnd"]) "vdd", "gnd"])
@ -125,8 +117,7 @@ class wordline_driver(design.design):
def place_drivers(self): def place_drivers(self):
inv1_xoffset = 2*self.m1_width + 5*self.m1_space nand2_xoffset = 2*self.m1_width + 5*self.m1_space
nand2_xoffset = inv1_xoffset + self.inv.width
inv2_xoffset = nand2_xoffset + self.nand2.width inv2_xoffset = nand2_xoffset + self.nand2.width
self.width = inv2_xoffset + self.inv.width self.width = inv2_xoffset + self.inv.width
@ -140,13 +131,9 @@ class wordline_driver(design.design):
y_offset = self.inv.height*row y_offset = self.inv.height*row
inst_mirror = "R0" inst_mirror = "R0"
inv1_offset = [inv1_xoffset, y_offset]
nand2_offset=[nand2_xoffset, y_offset] nand2_offset=[nand2_xoffset, y_offset]
inv2_offset=[inv2_xoffset, y_offset] inv2_offset=[inv2_xoffset, y_offset]
# add inv1 based on the info above
self.inv1_inst[row].place(offset=inv1_offset,
mirror=inst_mirror)
# add nand 2 # add nand 2
self.nand_inst[row].place(offset=nand2_offset, self.nand_inst[row].place(offset=nand2_offset,
mirror=inst_mirror) mirror=inst_mirror)
@ -159,7 +146,7 @@ class wordline_driver(design.design):
""" Route all of the signals """ """ Route all of the signals """
# Wordline enable connection # Wordline enable connection
en_pin=self.add_layout_pin(text="en", en_pin=self.add_layout_pin(text="en_bar",
layer="metal2", layer="metal2",
offset=[self.m1_width + 2*self.m1_space,0], offset=[self.m1_width + 2*self.m1_space,0],
width=self.m2_width, width=self.m2_width,
@ -167,12 +154,11 @@ class wordline_driver(design.design):
for row in range(self.rows): for row in range(self.rows):
inv1_inst = self.inv1_inst[row]
nand_inst = self.nand_inst[row] nand_inst = self.nand_inst[row]
inv2_inst = self.inv2_inst[row] inv2_inst = self.inv2_inst[row]
# en connection # en_bar connection
a_pin = inv1_inst.get_pin("A") a_pin = nand_inst.get_pin("A")
a_pos = a_pin.lc() a_pos = a_pin.lc()
clk_offset = vector(en_pin.bc().x,a_pos.y) clk_offset = vector(en_pin.bc().x,a_pos.y)
self.add_segment_center(layer="metal1", self.add_segment_center(layer="metal1",
@ -181,13 +167,6 @@ class wordline_driver(design.design):
self.add_via_center(layers=("metal1", "via1", "metal2"), self.add_via_center(layers=("metal1", "via1", "metal2"),
offset=clk_offset) offset=clk_offset)
# first inv to nand2 A
zb_pos = inv1_inst.get_pin("Z").bc()
zu_pos = inv1_inst.get_pin("Z").uc()
bl_pos = nand_inst.get_pin("A").lc()
br_pos = nand_inst.get_pin("A").rc()
self.add_path("metal1", [zb_pos, zu_pos, bl_pos, br_pos])
# Nand2 out to 2nd inv # Nand2 out to 2nd inv
zr_pos = nand_inst.get_pin("Z").rc() zr_pos = nand_inst.get_pin("Z").rc()
al_pos = inv2_inst.get_pin("A").lc() al_pos = inv2_inst.get_pin("A").lc()