mirror of
https://github.com/VLSIDA/OpenRAM.git
synced 2026-08-29 17:39:02 +02:00
Added member functions to bitcell.py and pbitcell.py for use in bitcell_array.py. bitcell_array now used only one function for every type of bitcell.
This commit is contained in:
Michael Timothy Grimes
@@ -30,47 +30,25 @@ class bitcell_array(design.design):
|
||||
self.height = self.row_size*self.cell.height + drc["well_enclosure_active"]
|
||||
self.width = self.column_size*self.cell.width
|
||||
|
||||
if(OPTS.bitcell == "pbitcell"):
|
||||
self.add_multiport_pins()
|
||||
else:
|
||||
self.add_pins()
|
||||
|
||||
self.add_pins()
|
||||
self.create_layout()
|
||||
|
||||
if(OPTS.bitcell == "pbitcell"):
|
||||
self.add_multiport_layout_pins()
|
||||
else:
|
||||
self.add_layout_pins()
|
||||
self.add_layout_pins()
|
||||
|
||||
self.DRC_LVS()
|
||||
|
||||
|
||||
|
||||
def add_pins(self):
|
||||
row_list = self.cell.list_row_pins()
|
||||
column_list = self.cell.list_column_pins()
|
||||
for col in range(self.column_size):
|
||||
self.add_pin("bl[{0}]".format(col))
|
||||
self.add_pin("br[{0}]".format(col))
|
||||
for cell_column in column_list:
|
||||
self.add_pin(cell_column+"[{0}]".format(col))
|
||||
for row in range(self.row_size):
|
||||
self.add_pin("wl[{0}]".format(row))
|
||||
for cell_row in row_list:
|
||||
self.add_pin(cell_row+"[{0}]".format(row))
|
||||
self.add_pin("vdd")
|
||||
self.add_pin("gnd")
|
||||
|
||||
def add_multiport_pins(self):
|
||||
self.num_write = self.cell.num_write
|
||||
self.num_read = self.cell.num_read
|
||||
|
||||
for col in range(self.column_size):
|
||||
for k in range(self.num_write):
|
||||
self.add_pin("wbl{0}[{1}]".format(k,col))
|
||||
self.add_pin("wbl_bar{0}[{1}]".format(k,col))
|
||||
for k in range(self.num_read):
|
||||
self.add_pin("rbl{0}[{1}]".format(k,col))
|
||||
self.add_pin("rbl_bar{0}[{1}]".format(k,col))
|
||||
for row in range(self.row_size):
|
||||
for k in range(self.num_write):
|
||||
self.add_pin("wrow{0}[{1}]".format(k,row))
|
||||
for k in range(self.num_read):
|
||||
self.add_pin("rrow{0}[{1}]".format(k,row))
|
||||
self.add_pin("vdd")
|
||||
self.add_pin("gnd")
|
||||
|
||||
def create_layout(self):
|
||||
xoffset = 0.0
|
||||
@@ -86,43 +64,17 @@ class bitcell_array(design.design):
|
||||
else:
|
||||
tempy = yoffset
|
||||
dir_key = ""
|
||||
|
||||
if(OPTS.bitcell == "pbitcell"):
|
||||
bitcell_nets = []
|
||||
for k in range(self.num_write):
|
||||
bitcell_nets.append("wbl{0}[{1}]".format(k,col))
|
||||
bitcell_nets.append("wbl_bar{0}[{1}]".format(k,col))
|
||||
for k in range(self.num_read):
|
||||
bitcell_nets.append("rbl{0}[{1}]".format(k,col))
|
||||
bitcell_nets.append("rbl_bar{0}[{1}]".format(k,col))
|
||||
for k in range(self.num_write):
|
||||
bitcell_nets.append("wrow{0}[{1}]".format(k,row))
|
||||
for k in range(self.num_read):
|
||||
bitcell_nets.append("rrow{0}[{1}]".format(k,row))
|
||||
bitcell_nets.append("vdd")
|
||||
bitcell_nets.append("gnd")
|
||||
|
||||
self.cell_inst[row,col]=self.add_inst(name=name,
|
||||
mod=self.cell,
|
||||
offset=[xoffset, tempy],
|
||||
mirror=dir_key)
|
||||
self.connect_inst(bitcell_nets)
|
||||
|
||||
else:
|
||||
self.cell_inst[row,col]=self.add_inst(name=name,
|
||||
mod=self.cell,
|
||||
offset=[xoffset, tempy],
|
||||
mirror=dir_key)
|
||||
self.connect_inst(["bl[{0}]".format(col),
|
||||
"br[{0}]".format(col),
|
||||
"wl[{0}]".format(row),
|
||||
"vdd",
|
||||
"gnd"])
|
||||
|
||||
self.cell_inst[row,col]=self.add_inst(name=name,
|
||||
mod=self.cell,
|
||||
offset=[xoffset, tempy],
|
||||
mirror=dir_key)
|
||||
self.connect_inst(self.cell.list_bitcell_pins(col, row))
|
||||
|
||||
yoffset += self.cell.height
|
||||
xoffset += self.cell.width
|
||||
|
||||
|
||||
|
||||
def add_layout_pins(self):
|
||||
|
||||
# Our cells have multiple gnd pins for now.
|
||||
@@ -147,21 +99,19 @@ class bitcell_array(design.design):
|
||||
# overlapping cells
|
||||
full_width = self.width - 2*lower_x
|
||||
|
||||
row_list = self.cell.list_row_pins()
|
||||
column_list = self.cell.list_column_pins()
|
||||
|
||||
offset = vector(0.0, 0.0)
|
||||
for col in range(self.column_size):
|
||||
# get the pin of the lower row cell and make it the full width
|
||||
bl_pin = self.cell_inst[0,col].get_pin("BL")
|
||||
br_pin = self.cell_inst[0,col].get_pin("BR")
|
||||
self.add_layout_pin(text="bl[{0}]".format(col),
|
||||
layer="metal2",
|
||||
offset=bl_pin.ll(),
|
||||
width=bl_pin.width(),
|
||||
height=full_height)
|
||||
self.add_layout_pin(text="br[{0}]".format(col),
|
||||
layer="metal2",
|
||||
offset=br_pin.ll(),
|
||||
width=br_pin.width(),
|
||||
height=full_height)
|
||||
# get the pins of the lower row cell and make it the full width
|
||||
for cell_column in column_list:
|
||||
bl_pin = self.cell_inst[0,col].get_pin(cell_column)
|
||||
self.add_layout_pin(text=cell_column+"[{0}]".format(col),
|
||||
layer="metal2",
|
||||
offset=bl_pin.ll(),
|
||||
width=bl_pin.width(),
|
||||
height=full_height)
|
||||
|
||||
# gnd offset is 0 in our cell, but it be non-zero
|
||||
gnd_pins = self.cell_inst[0,col].get_pins("gnd")
|
||||
@@ -180,112 +130,17 @@ class bitcell_array(design.design):
|
||||
|
||||
offset.x = 0.0
|
||||
for row in range(self.row_size):
|
||||
wl_pin = self.cell_inst[row,0].get_pin("WL")
|
||||
vdd_pins = self.cell_inst[row,0].get_pins("vdd")
|
||||
gnd_pins = self.cell_inst[row,0].get_pins("gnd")
|
||||
|
||||
for gnd_pin in gnd_pins:
|
||||
if gnd_pin.layer=="metal1":
|
||||
self.add_layout_pin(text="gnd",
|
||||
layer="metal1",
|
||||
offset=gnd_pin.ll(),
|
||||
width=full_width,
|
||||
height=drc["minwidth_metal1"])
|
||||
|
||||
# add vdd label and offset
|
||||
# only add to even rows to avoid duplicates
|
||||
for vdd_pin in vdd_pins:
|
||||
if row % 2 == 0 and vdd_pin.layer=="metal1":
|
||||
self.add_layout_pin(text="vdd",
|
||||
layer="metal1",
|
||||
offset=vdd_pin.ll(),
|
||||
width=full_width,
|
||||
height=drc["minwidth_metal1"])
|
||||
|
||||
# add wl label and offset
|
||||
self.add_layout_pin(text="wl[{0}]".format(row),
|
||||
layer="metal1",
|
||||
offset=wl_pin.ll(),
|
||||
width=full_width,
|
||||
height=wl_pin.height())
|
||||
|
||||
# increments to the next row height
|
||||
offset.y += self.cell.height
|
||||
|
||||
|
||||
def add_multiport_layout_pins(self):
|
||||
|
||||
# Our cells have multiple gnd pins for now.
|
||||
# FIXME: fix for multiple vdd too
|
||||
vdd_pin = self.cell.get_pin("vdd")
|
||||
|
||||
# shift it up by the overlap amount (gnd_pin) too
|
||||
# must find the lower gnd pin to determine this overlap
|
||||
lower_y = self.cell.height
|
||||
gnd_pins = self.cell.get_pins("gnd")
|
||||
for gnd_pin in gnd_pins:
|
||||
if gnd_pin.layer=="metal2" and gnd_pin.by()<lower_y:
|
||||
lower_y=gnd_pin.by()
|
||||
|
||||
# lower_y is negative, so subtract off double this amount for each pair of
|
||||
# overlapping cells
|
||||
full_height = self.height - 2*lower_y
|
||||
|
||||
vdd_pin = self.cell.get_pin("vdd")
|
||||
lower_x = vdd_pin.lx()
|
||||
# lower_x is negative, so subtract off double this amount for each pair of
|
||||
# overlapping cells
|
||||
full_width = self.width - 2*lower_x
|
||||
|
||||
offset = vector(0.0, 0.0)
|
||||
for col in range(self.column_size):
|
||||
# get the pin of the lower row cell and make it the full width
|
||||
for k in range(self.num_write):
|
||||
wbl_pin = self.cell_inst[0,col].get_pin("wbl{0}".format(k))
|
||||
self.add_layout_pin(text="wbl{0}[{1}]".format(k,col),
|
||||
layer="metal2",
|
||||
offset=wbl_pin.ll(),
|
||||
width=wbl_pin.width(),
|
||||
height=full_height)
|
||||
wbl_bar_pin = self.cell_inst[0,col].get_pin("wbl_bar{0}".format(k))
|
||||
self.add_layout_pin(text="wbl_bar{0}[{1}]".format(k,col),
|
||||
layer="metal2",
|
||||
offset=wbl_bar_pin.ll(),
|
||||
width=wbl_bar_pin.width(),
|
||||
height=full_height)
|
||||
for k in range(self.num_read):
|
||||
rbl_pin = self.cell_inst[0,col].get_pin("rbl{0}".format(k))
|
||||
self.add_layout_pin(text="rbl{0}[{1}]".format(k,col),
|
||||
layer="metal2",
|
||||
offset=rbl_pin.ll(),
|
||||
width=rbl_pin.width(),
|
||||
height=full_height)
|
||||
rbl_bar_pin = self.cell_inst[0,col].get_pin("rbl_bar{0}".format(k))
|
||||
self.add_layout_pin(text="rbl_bar{0}[{1}]".format(k,col),
|
||||
layer="metal2",
|
||||
offset=rbl_bar_pin.ll(),
|
||||
width=rbl_bar_pin.width(),
|
||||
height=full_height)
|
||||
|
||||
# gnd offset is 0 in our cell, but it be non-zero
|
||||
gnd_pins = self.cell_inst[0,col].get_pins("gnd")
|
||||
for gnd_pin in gnd_pins:
|
||||
# avoid duplicates by only doing even rows
|
||||
# also skip if it isn't the pin that spans the entire cell down to the bottom
|
||||
if gnd_pin.layer=="metal2" and gnd_pin.by()==lower_y:
|
||||
self.add_layout_pin(text="gnd",
|
||||
layer="metal2",
|
||||
offset=gnd_pin.ll(),
|
||||
width=gnd_pin.width(),
|
||||
height=full_height)
|
||||
|
||||
# increments to the next column width
|
||||
offset.x += self.cell.width
|
||||
|
||||
offset.x = 0.0
|
||||
for row in range(self.row_size):
|
||||
vdd_pins = self.cell_inst[row,0].get_pins("vdd")
|
||||
gnd_pins = self.cell_inst[row,0].get_pins("gnd")
|
||||
# add wl label and offset
|
||||
for cell_row in row_list:
|
||||
wl_pin = self.cell_inst[row,0].get_pin(cell_row)
|
||||
self.add_layout_pin(text=cell_row+"[{0}]".format(row),
|
||||
layer="metal1",
|
||||
offset=wl_pin.ll(),
|
||||
width=full_width,
|
||||
height=wl_pin.height())
|
||||
|
||||
for gnd_pin in gnd_pins:
|
||||
if gnd_pin.layer=="metal1":
|
||||
@@ -304,23 +159,6 @@ class bitcell_array(design.design):
|
||||
offset=vdd_pin.ll(),
|
||||
width=full_width,
|
||||
height=drc["minwidth_metal1"])
|
||||
|
||||
# add wl label and offset
|
||||
for k in range(self.num_write):
|
||||
wrow_pin = self.cell_inst[row,0].get_pin("wrow{0}".format(k))
|
||||
self.add_layout_pin(text="wrow{0}[{1}]".format(k,row),
|
||||
layer="metal1",
|
||||
offset=wrow_pin.ll(),
|
||||
width=full_width,
|
||||
height=wrow_pin.height())
|
||||
|
||||
for k in range(self.num_read):
|
||||
rrow_pin = self.cell_inst[row,0].get_pin("rrow{0}".format(k))
|
||||
self.add_layout_pin(text="rrow{0}[{1}]".format(k,row),
|
||||
layer="metal1",
|
||||
offset=rrow_pin.ll(),
|
||||
width=full_width,
|
||||
height=rrow_pin.height())
|
||||
|
||||
# increments to the next row height
|
||||
offset.y += self.cell.height
|
||||
|
||||
Reference in New Issue
Block a user