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fixing decoder lvs

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This commit is contained in:
Jacob Walker
2023-03-30 11:30:50 -07:00
parent 559300e5cc
commit 16df8e0e43
7 changed files with 89 additions and 53 deletions
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compiler/modules/rom_wordline_driver_array.py
+59 -17
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@@ -28,6 +28,12 @@ class rom_wordline_driver_array(design):
self.cols = cols
self.invert_outputs=invert_outputs
self.tap_spacing = tap_spacing
if OPTS.tech_name == "sky130":
self.supply_layer = "m1"
else:
self.supply_layer = "m2"
self.create_netlist()
if not OPTS.netlist_only:
self.create_layout()
@@ -45,8 +51,8 @@ class rom_wordline_driver_array(design):
self.place_drivers()
self.route_layout()
self.route_supplies()
self.place_taps()
self.add_boundary()
self.DRC_LVS()
def add_pins(self):
# inputs to wordline_driver.
@@ -60,6 +66,7 @@ class rom_wordline_driver_array(design):
def add_modules(self):
b = factory.create(module_type="rom_base_cell")
self.tap = factory.create(module_type="rom_poly_tap", add_tap = True)
if self.invert_outputs:
self.wl_driver = factory.create(module_type="pinv_dec",
@@ -67,19 +74,12 @@ class rom_wordline_driver_array(design):
height=b.height,
add_wells=False)
self.wl_driver_tap = factory.create(module_type="pinv_dec",
size=self.cols,
add_wells=True)
else:
self.wl_driver = factory.create(module_type="pbuf_dec",
size=self.cols,
height=b.height,
add_wells=False)
self.wl_driver_tap = factory.create(module_type="pbuf_dec",
size=self.cols,
add_wells=True)
print(self.wl_driver.height)
print(self.wl_driver_tap.height)
def route_supplies(self):
"""
@@ -89,6 +89,8 @@ class rom_wordline_driver_array(design):
if layer_props.wordline_driver.vertical_supply:
self.route_vertical_pins("vdd", self.wld_inst)
self.route_vertical_pins("gnd", self.wld_inst)
self.route_vertical_pins("vdd", self.wld_inst, layer=self.supply_layer)
self.route_vertical_pins("gnd", self.wld_inst, layer=self.supply_layer)
else:
self.route_vertical_pins("vdd", self.wld_inst, xside="rx",)
self.route_vertical_pins("gnd", self.wld_inst, xside="lx",)
@@ -96,12 +98,8 @@ class rom_wordline_driver_array(design):
def create_drivers(self):
self.wld_inst = []
for row in range(self.rows):
if row % self.tap_spacing == 0:
self.wld_inst.append(self.add_inst(name="wld{0}".format(row),
mod=self.wl_driver_tap))
else:
self.wld_inst.append(self.add_inst(name="wld{0}".format(row),
mod=self.wl_driver))
self.wld_inst.append(self.add_inst(name="wld{0}".format(row),
mod=self.wl_driver))
self.connect_inst(["in_{0}".format(row),
"out_{0}".format(row),
"vdd", "gnd"])
@@ -109,13 +107,14 @@ class rom_wordline_driver_array(design):
def place_drivers(self):
y_offset = 0
for row in range(self.rows):
# These are flipped since we always start with an RBL on the bottom
if row % self.tap_spacing == 0:
y_offset += self.tap.pitch_offset
offset = [0, y_offset]
self.wld_inst[row].place(offset=offset)
y_offset += self.wld_inst[row].height
self.width = self.wl_driver.width
self.height = self.wl_driver.height * self.rows
@@ -137,3 +136,46 @@ class rom_wordline_driver_array(design):
end=end)
self.add_layout_pin_rect_center(text="out_{}".format(row), layer=self.route_layer, offset=end - vector(0, 0.5 * route_width))
def place_taps(self):
for wl in range(0 , self.rows, self.tap_spacing):
driver = self.wld_inst[wl]
source_pin1 = driver.get_pins("vdd")[0]
gnd_pin1 = driver.get_pins("gnd")[0]
left_edge = driver.get_pin("Z").cy() - 0.5 * self.contact_width - self.active_enclose_contact - self.active_space - 0.5 * self.active_contact.width
contact_pos = vector(source_pin1.cx(), left_edge)
self.place_tap(contact_pos, "n")
contact_pos = vector( gnd_pin1.cx(), left_edge)
self.place_tap(contact_pos, "p")
if not self.invert_outputs:
source_pin2 = driver.get_pins("vdd")[1]
gnd_pin2 = driver.get_pins("gnd")[1]
contact_pos = vector(source_pin2.cx(), left_edge)
self.place_tap(contact_pos, "n")
contact_pos = vector( gnd_pin2.cx(), left_edge)
self.place_tap(contact_pos, "p")
def place_tap(self, offset, well_type):
self.add_via_center(layers=self.active_stack,
offset=offset,
implant_type=well_type,
well_type=well_type,
directions="nonpref")
self.add_via_stack_center(offset=offset,
from_layer=self.active_stack[2],
to_layer=self.supply_layer)
if well_type == "p":
pin = "gnd"
else:
pin = "vdd"
self.add_layout_pin_rect_center(text=pin, layer=self.supply_layer, offset=offset)