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Add supply rails to dff array. PEP8 cleanup.

This commit is contained in:
mrg 2020-04-21 15:21:29 -07:00
parent 5f76514cf0
commit cd66ddb37c
2 changed files with 44 additions and 23 deletions
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29
compiler/modules/dff_buf.py
View File

@ -52,9 +52,8 @@ class dff_buf(design.design):
def create_layout(self): def create_layout(self):
self.place_instances() self.place_instances()
self.width = self.inv2_inst.rx() self.width = self.inv2_inst.rx()
self.height = self.dff.height self.height = self.dff.height
self.route_wires() self.route_wires()
self.add_layout_pins() self.add_layout_pins()
self.add_boundary() self.add_boundary()
@ -74,8 +73,6 @@ class dff_buf(design.design):
height=self.dff.height) height=self.dff.height)
self.add_mod(self.inv2) self.add_mod(self.inv2)
def add_pins(self): def add_pins(self):
self.add_pin("D", "INPUT") self.add_pin("D", "INPUT")
self.add_pin("Q", "OUTPUT") self.add_pin("Q", "OUTPUT")
@ -96,17 +93,19 @@ class dff_buf(design.design):
self.inv1_inst=self.add_inst(name="dff_buf_inv1", self.inv1_inst=self.add_inst(name="dff_buf_inv1",
mod=self.inv1) mod=self.inv1)
self.connect_inst(["qint", "Qb", "vdd", "gnd"]) self.connect_inst(["qint", "Qb", "vdd", "gnd"])
self.inv2_inst=self.add_inst(name="dff_buf_inv2", self.inv2_inst=self.add_inst(name="dff_buf_inv2",
mod=self.inv2) mod=self.inv2)
self.connect_inst(["Qb", "Q", "vdd", "gnd"]) self.connect_inst(["Qb", "Q", "vdd", "gnd"])
def place_instances(self): def place_instances(self):
# Add the DFF # Add the DFF
self.dff_inst.place(vector(0,0)) self.dff_inst.place(vector(0, 0))
# Add INV1 to the right # Add INV1 to the right
# The INV needs well spacing because the DFF is likely from a library
# with different well construction rules
well_spacing = 0 well_spacing = 0
try: try:
well_spacing = max(well_spacing, self.nwell_space) well_spacing = max(well_spacing, self.nwell_space)
@ -129,7 +128,7 @@ class dff_buf(design.design):
# Route dff q to inv1 a # Route dff q to inv1 a
q_pin = self.dff_inst.get_pin("Q") q_pin = self.dff_inst.get_pin("Q")
a1_pin = self.inv1_inst.get_pin("A") a1_pin = self.inv1_inst.get_pin("A")
mid_x_offset = 0.5*(a1_pin.cx() + q_pin.cx()) mid_x_offset = 0.5 * (a1_pin.cx() + q_pin.cx())
mid1 = vector(mid_x_offset, q_pin.cy()) mid1 = vector(mid_x_offset, q_pin.cy())
mid2 = vector(mid_x_offset, a1_pin.cy()) mid2 = vector(mid_x_offset, a1_pin.cy())
self.add_path("m3", [q_pin.center(), mid1, mid2, a1_pin.center()]) self.add_path("m3", [q_pin.center(), mid1, mid2, a1_pin.center()])
@ -143,7 +142,7 @@ class dff_buf(design.design):
# Route inv1 z to inv2 a # Route inv1 z to inv2 a
z1_pin = self.inv1_inst.get_pin("Z") z1_pin = self.inv1_inst.get_pin("Z")
a2_pin = self.inv2_inst.get_pin("A") a2_pin = self.inv2_inst.get_pin("A")
mid_x_offset = 0.5*(z1_pin.cx() + a2_pin.cx()) mid_x_offset = 0.5 * (z1_pin.cx() + a2_pin.cx())
self.mid_qb_pos = vector(mid_x_offset, z1_pin.cy()) self.mid_qb_pos = vector(mid_x_offset, z1_pin.cy())
mid2 = vector(mid_x_offset, a2_pin.cy()) mid2 = vector(mid_x_offset, a2_pin.cy())
self.add_path("m1", [z1_pin.center(), self.mid_qb_pos, mid2, a2_pin.center()]) self.add_path("m1", [z1_pin.center(), self.mid_qb_pos, mid2, a2_pin.center()])
@ -181,8 +180,8 @@ class dff_buf(design.design):
height=din_pin.height()) height=din_pin.height())
dout_pin = self.inv2_inst.get_pin("Z") dout_pin = self.inv2_inst.get_pin("Z")
mid_pos = dout_pin.center() + vector(self.m1_pitch,0) mid_pos = dout_pin.center() + vector(self.m1_pitch, 0)
q_pos = mid_pos - vector(0,self.m2_pitch) q_pos = mid_pos - vector(0, self.m2_pitch)
self.add_layout_pin_rect_center(text="Q", self.add_layout_pin_rect_center(text="Q",
layer="m2", layer="m2",
offset=q_pos) offset=q_pos)
@ -190,7 +189,7 @@ class dff_buf(design.design):
self.add_via_center(layers=self.m1_stack, self.add_via_center(layers=self.m1_stack,
offset=q_pos) offset=q_pos)
qb_pos = self.mid_qb_pos + vector(0,self.m2_pitch) qb_pos = self.mid_qb_pos + vector(0, self.m2_pitch)
self.add_layout_pin_rect_center(text="Qb", self.add_layout_pin_rect_center(text="Qb",
layer="m2", layer="m2",
offset=qb_pos) offset=qb_pos)
@ -200,7 +199,7 @@ class dff_buf(design.design):
def get_clk_cin(self): def get_clk_cin(self):
"""Return the total capacitance (in relative units) that the clock is loaded by in the dff""" """Return the total capacitance (in relative units) that the clock is loaded by in the dff"""
#This is a handmade cell so the value must be entered in the tech.py file or estimated. # This is a handmade cell so the value must be entered in the tech.py file or estimated.
#Calculated in the tech file by summing the widths of all the gates and dividing by the minimum width. # Calculated in the tech file by summing the widths of all the gates and dividing by the minimum width.
#FIXME: Dff changed in a past commit. The parameter need to be updated. # FIXME: Dff changed in a past commit. The parameter need to be updated.
return parameter["dff_clk_cin"] return parameter["dff_clk_cin"]

32
compiler/modules/dff_buf_array.py
View File

@ -48,6 +48,7 @@ class dff_buf_array(design.design):
self.width = self.columns * self.dff.width self.width = self.columns * self.dff.width
self.height = self.rows * self.dff.height self.height = self.rows * self.dff.height
self.place_dff_array() self.place_dff_array()
self.route_supplies()
self.add_layout_pins() self.add_layout_pins()
self.add_boundary() self.add_boundary()
self.DRC_LVS() self.DRC_LVS()
@ -94,15 +95,25 @@ class dff_buf_array(design.design):
def place_dff_array(self): def place_dff_array(self):
well_spacing = max(self.nwell_space, well_spacing = 0
self.pwell_space, try:
self.pwell_to_nwell) well_spacing = max(self.nwell_space, well_spacing)
except AttributeError:
pass
try:
well_spacing = max(self.pwell_space, well_spacing)
except AttributeError:
pass
try:
well_spacing = max(self.pwell_to_nwell, well_spacing)
except AttributeError:
pass
dff_pitch = self.dff.width + well_spacing + self.well_extend_active dff_pitch = self.dff.width + well_spacing + self.well_extend_active
for row in range(self.rows): for row in range(self.rows):
for col in range(self.columns): for col in range(self.columns):
name = "Xdff_r{0}_c{1}".format(row, col) # name = "Xdff_r{0}_c{1}".format(row, col)
if (row % 2 == 0): if (row % 2 == 0):
base = vector(col * dff_pitch, row * self.dff.height) base = vector(col * dff_pitch, row * self.dff.height)
mirror = "R0" mirror = "R0"
@ -142,7 +153,16 @@ class dff_buf_array(design.design):
return dout_bar_name return dout_bar_name
def add_layout_pins(self): def route_supplies(self):
for row in range(self.rows):
vdd0_pin=self.dff_insts[row, 0].get_pin("vdd")
vddn_pin=self.dff_insts[row, self.columns - 1].get_pin("vdd")
self.add_path(vdd0_pin.layer, [vdd0_pin.lc(), vddn_pin.rc()], width=vdd0_pin.height())
gnd0_pin=self.dff_insts[row, 0].get_pin("gnd")
gndn_pin=self.dff_insts[row, self.columns - 1].get_pin("gnd")
self.add_path(gnd0_pin.layer, [gnd0_pin.lc(), gndn_pin.rc()], width=gnd0_pin.height())
for row in range(self.rows): for row in range(self.rows):
for col in range(self.columns): for col in range(self.columns):
# Continous vdd rail along with label. # Continous vdd rail along with label.
@ -153,6 +173,8 @@ class dff_buf_array(design.design):
gnd_pin=self.dff_insts[row, col].get_pin("gnd") gnd_pin=self.dff_insts[row, col].get_pin("gnd")
self.add_power_pin("gnd", gnd_pin.lc()) self.add_power_pin("gnd", gnd_pin.lc())
def add_layout_pins(self):
for row in range(self.rows): for row in range(self.rows):
for col in range(self.columns): for col in range(self.columns):
din_pin = self.dff_insts[row, col].get_pin("D") din_pin = self.dff_insts[row, col].get_pin("D")