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Move supply to M3 in wordline driver

This commit is contained in:
Matt Guthaus 2018-04-11 16:23:45 -07:00
parent e2f93a0a99
commit e038561b4a
1 changed files with 94 additions and 82 deletions
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176
compiler/modules/wordline_driver.py
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@ -37,11 +37,13 @@ class wordline_driver(design.design):
self.add_pin("gnd")
def design_layout(self):
self.add_layout()
self.offsets_of_gates()
self.create_layout()
self.create_modules()
self.add_modules()
self.route_layout()
self.route_vdd_gnd()
def add_layout(self):
def create_modules(self):
self.inv = pinv()
self.add_mod(self.inv)
@ -51,18 +53,95 @@ class wordline_driver(design.design):
self.nand2 = pnand2()
self.add_mod(self.nand2)
def route_vdd_gnd(self):
""" 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
a_xoffset = self.inv1_inst[0].rx()
b_xoffset = self.inv2_inst[0].lx()
for num in range(self.rows):
# this will result in duplicate polygons for rails, but who cares
# use the inverter offset even though it will be the nand's too
(gate_offset, y_dir) = self.get_gate_offset(0, self.inv.height, num)
# Route both supplies
for n in ["vdd", "gnd"]:
supply_pin = self.inv2_inst[num].get_pin(n)
# Add pins in two locations
for xoffset in [a_xoffset, b_xoffset]:
pin_pos = vector(xoffset, supply_pin.cy())
self.add_via_center(layers=("metal1", "via1", "metal2"),
offset=pin_pos,
rotate=90)
self.add_via_center(layers=("metal2", "via2", "metal3"),
offset=pin_pos,
rotate=90)
self.add_layout_pin_rect_center(text=n,
layer="metal3",
offset=pin_pos)
def offsets_of_gates(self):
self.x_offset0 = 2*self.m1_width + 5*self.m1_space
self.x_offset1 = self.x_offset0 + self.inv.width
self.x_offset2 = self.x_offset1 + self.nand2.width
self.width = self.x_offset2 + self.inv.width
def add_modules(self):
inv1_xoffset = 2*self.m1_width + 5*self.m1_space
nand2_xoffset = inv1_xoffset + self.inv.width
inv2_xoffset = nand2_xoffset + self.nand2.width
self.width = inv2_xoffset + self.inv.width
self.height = self.inv.height * self.rows
def create_layout(self):
self.inv1_inst = []
self.nand_inst = []
self.inv2_inst = []
for row in range(self.rows):
name_inv1 = "wl_driver_inv_en{}".format(row)
name_nand = "wl_driver_nand{}".format(row)
name_inv2 = "wl_driver_inv{}".format(row)
if (row % 2):
y_offset = self.inv.height*(row + 1)
inst_mirror = "MX"
else:
y_offset = self.inv.height*row
inst_mirror = "R0"
inv1_offset = [inv1_xoffset, y_offset]
nand2_offset=[nand2_xoffset, y_offset]
inv2_offset=[inv2_xoffset, y_offset]
# add inv1 based on the info above
self.inv1_inst.append(self.add_inst(name=name_inv1,
mod=self.inv_no_output,
offset=inv1_offset,
mirror=inst_mirror))
self.connect_inst(["en",
"en_bar[{0}]".format(row),
"vdd", "gnd"])
# add nand 2
self.nand_inst.append(self.add_inst(name=name_nand,
mod=self.nand2,
offset=nand2_offset,
mirror=inst_mirror))
self.connect_inst(["en_bar[{0}]".format(row),
"in[{0}]".format(row),
"net[{0}]".format(row),
"vdd", "gnd"])
# add inv2
self.inv2_inst.append(self.add_inst(name=name_inv2,
mod=self.inv,
offset=inv2_offset,
mirror=inst_mirror))
self.connect_inst(["net[{0}]".format(row),
"wl[{0}]".format(row),
"vdd", "gnd"])
def route_layout(self):
""" Route all of the signals """
# Wordline enable connection
en_pin=self.add_layout_pin(text="en",
layer="metal2",
@ -70,79 +149,12 @@ class wordline_driver(design.design):
width=self.m2_width,
height=self.height)
self.add_layout_pin(text="gnd",
layer="metal1",
offset=[0, -0.5*self.m1_width],
width=self.x_offset0,
height=self.m1_width)
for row in range(self.rows):
name_inv1 = "wl_driver_inv_en{}".format(row)
name_nand = "wl_driver_nand{}".format(row)
name_inv2 = "wl_driver_inv{}".format(row)
inv_nand2B_connection_height = (abs(self.inv.get_pin("Z").ll().y
- self.nand2.get_pin("B").ll().y)
+ self.m1_width)
if (row % 2):
y_offset = self.inv.height*(row + 1)
inst_mirror = "MX"
cell_dir = vector(0,-1)
m1tm2_rotate=270
m1tm2_mirror="R0"
else:
y_offset = self.inv.height*row
inst_mirror = "R0"
cell_dir = vector(0,1)
m1tm2_rotate=90
m1tm2_mirror="MX"
name_inv1_offset = [self.x_offset0, y_offset]
nand2_offset=[self.x_offset1, y_offset]
inv2_offset=[self.x_offset2, y_offset]
base_offset = vector(self.width, y_offset)
# Extend vdd and gnd of wordline_driver
yoffset = (row + 1) * self.inv.height - 0.5 * self.m1_width
if (row % 2):
pin_name = "gnd"
else:
pin_name = "vdd"
self.add_layout_pin(text=pin_name,
layer="metal1",
offset=[0, yoffset],
width=self.x_offset0,
height=self.m1_width)
inv1_inst = self.inv1_inst[row]
nand_inst = self.nand_inst[row]
inv2_inst = self.inv2_inst[row]
# add inv1 based on the info above
inv1_inst=self.add_inst(name=name_inv1,
mod=self.inv_no_output,
offset=name_inv1_offset,
mirror=inst_mirror )
self.connect_inst(["en",
"en_bar[{0}]".format(row),
"vdd", "gnd"])
# add nand 2
nand_inst=self.add_inst(name=name_nand,
mod=self.nand2,
offset=nand2_offset,
mirror=inst_mirror)
self.connect_inst(["en_bar[{0}]".format(row),
"in[{0}]".format(row),
"net[{0}]".format(row),
"vdd", "gnd"])
# add inv2
inv2_inst=self.add_inst(name=name_inv2,
mod=self.inv,
offset=inv2_offset,
mirror=inst_mirror)
self.connect_inst(["net[{0}]".format(row),
"wl[{0}]".format(row),
"vdd", "gnd"])
# en connection
a_pin = inv1_inst.get_pin("A")
a_pos = a_pin.lc()