mirror of https://github.com/VLSIDA/OpenRAM.git
192 lines
7.5 KiB
Python
192 lines
7.5 KiB
Python
import debug
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import design
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from tech import drc
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from math import log
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from vector import vector
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from globals import OPTS
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import dff_buf
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class dff_buf_array(design.design):
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"""
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This is a simple row (or multiple rows) of flops.
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Unlike the data flops, these are never spaced out.
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"""
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def __init__(self, rows, columns, inv1_size=2, inv2_size=4, name=""):
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self.rows = rows
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self.columns = columns
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if name=="":
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name = "dff_array_{0}x{1}".format(rows, columns)
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design.design.__init__(self, name)
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debug.info(1, "Creating {}".format(self.name))
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self.dff = dff_buf.dff_buf(inv1_size, inv2_size)
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self.add_mod(self.dff)
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self.width = self.columns * self.dff.width
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self.height = self.rows * self.dff.height
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self.create_layout()
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def create_layout(self):
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self.add_pins()
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self.create_dff_array()
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self.add_layout_pins()
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self.DRC_LVS()
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def add_pins(self):
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for y in range(self.rows):
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for x in range(self.columns):
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self.add_pin(self.get_din_name(y,x))
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for y in range(self.rows):
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for x in range(self.columns):
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self.add_pin(self.get_dout_name(y,x))
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self.add_pin(self.get_dout_bar_name(y,x))
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self.add_pin("clk")
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self.add_pin("vdd")
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self.add_pin("gnd")
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def create_dff_array(self):
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self.dff_insts={}
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for y in range(self.rows):
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for x in range(self.columns):
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name = "Xdff_r{0}_c{1}".format(y,x)
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if (y % 2 == 0):
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base = vector(x*self.dff.width,y*self.dff.height)
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mirror = "R0"
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else:
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base = vector(x*self.dff.width,(y+1)*self.dff.height)
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mirror = "MX"
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self.dff_insts[x,y]=self.add_inst(name=name,
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mod=self.dff,
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offset=base,
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mirror=mirror)
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self.connect_inst([self.get_din_name(y,x),
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self.get_dout_name(y,x),
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self.get_dout_bar_name(y,x),
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"clk",
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"vdd",
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"gnd"])
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def get_din_name(self, row, col):
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if self.columns == 1:
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din_name = "din[{0}]".format(row)
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elif self.rows == 1:
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din_name = "din[{0}]".format(col)
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else:
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din_name = "din[{0}][{1}]".format(row,col)
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return din_name
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def get_dout_name(self, row, col):
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if self.columns == 1:
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dout_name = "dout[{0}]".format(row)
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elif self.rows == 1:
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dout_name = "dout[{0}]".format(col)
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else:
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dout_name = "dout[{0}][{1}]".format(row,col)
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return dout_name
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def get_dout_bar_name(self, row, col):
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if self.columns == 1:
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dout_bar_name = "dout_bar[{0}]".format(row)
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elif self.rows == 1:
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dout_bar_name = "dout_bar[{0}]".format(col)
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else:
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dout_bar_name = "dout_bar[{0}][{1}]".format(row,col)
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return dout_bar_name
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def add_layout_pins(self):
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xoffsets = []
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for x in range(self.columns):
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xoffsets.append(self.dff_insts[x,0].get_pin("gnd").lx())
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for y in range(self.rows):
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# Route both supplies
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for n in ["vdd", "gnd"]:
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supply_pin = self.dff_insts[0,y].get_pin(n)
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supply_offset = supply_pin.ll()
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self.add_rect(layer="metal1",
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offset=supply_offset,
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width=self.width)
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# Add pins in two locations
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for xoffset in xoffsets:
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pin_pos = vector(xoffset, supply_pin.cy())
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self.add_via_center(layers=("metal1", "via1", "metal2"),
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offset=pin_pos,
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rotate=90)
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self.add_via_center(layers=("metal2", "via2", "metal3"),
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offset=pin_pos,
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rotate=90)
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self.add_layout_pin_rect_center(text=n,
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layer="metal3",
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offset=pin_pos)
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for y in range(self.rows):
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for x in range(self.columns):
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din_pin = self.dff_insts[x,y].get_pin("D")
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debug.check(din_pin.layer=="metal2","DFF D pin not on metal2")
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self.add_layout_pin(text=self.get_din_name(y,x),
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layer=din_pin.layer,
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offset=din_pin.ll(),
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width=din_pin.width(),
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height=din_pin.height())
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dout_pin = self.dff_insts[x,y].get_pin("Q")
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debug.check(dout_pin.layer=="metal2","DFF Q pin not on metal2")
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self.add_layout_pin(text=self.get_dout_name(y,x),
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layer=dout_pin.layer,
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offset=dout_pin.ll(),
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width=dout_pin.width(),
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height=dout_pin.height())
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dout_bar_pin = self.dff_insts[x,y].get_pin("Qb")
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debug.check(dout_bar_pin.layer=="metal2","DFF Qb pin not on metal2")
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self.add_layout_pin(text=self.get_dout_bar_name(y,x),
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layer=dout_bar_pin.layer,
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offset=dout_bar_pin.ll(),
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width=dout_bar_pin.width(),
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height=dout_bar_pin.height())
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# Create vertical spines to a single horizontal rail
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clk_pin = self.dff_insts[0,0].get_pin("clk")
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debug.check(clk_pin.layer=="metal2","DFF clk pin not on metal2")
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if self.columns==1:
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self.add_layout_pin(text="clk",
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layer="metal2",
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offset=clk_pin.ll().scale(1,0),
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width=self.m2_width,
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height=self.height)
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else:
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self.add_layout_pin(text="clk",
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layer="metal3",
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offset=vector(0,2*self.m2_width),
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width=self.width,
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height=self.m3_width)
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for x in range(self.columns):
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clk_pin = self.dff_insts[x,0].get_pin("clk")
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# Make a vertical strip for each column
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self.add_layout_pin(text="clk",
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layer="metal2",
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offset=clk_pin.ll().scale(1,0),
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width=self.m2_width,
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height=self.height)
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# Drop a via to the M3 pin
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self.add_via_center(layers=("metal2","via2","metal3"),
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offset=clk_pin.center().scale(1,0) + vector(0,2*self.m2_width))
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def analytical_delay(self, slew, load=0.0):
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return self.dff.analytical_delay(slew=slew, load=load)
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