mirror of https://github.com/VLSIDA/OpenRAM.git
PEP8 wordline driver
This commit is contained in:
Matthew Guthaus
parent
ecbed870c0
commit
35e65fc6f2
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@ -5,17 +5,14 @@
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# (acting for and on behalf of Oklahoma State University)
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# All rights reserved.
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#
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from tech import drc, parameter
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import debug
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import design
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import contact
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from math import log
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from math import sqrt
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import math
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from vector import vector
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from sram_factory import factory
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from globals import OPTS
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class wordline_driver(design.design):
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"""
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Creates a Wordline Driver
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@ -58,26 +55,20 @@ class wordline_driver(design.design):
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self.add_pin("vdd", "POWER")
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self.add_pin("gnd", "GROUND")
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def add_modules(self):
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# This is just used for measurements,
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# so don't add the module
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self.inv = factory.create(module_type="pdriver",
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fanout=self.cols,
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neg_polarity=True)
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self.add_mod(self.inv)
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self.inv_no_output = factory.create(module_type="pinv",
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route_output=False)
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self.add_mod(self.inv_no_output)
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self.nand2 = factory.create(module_type="pnand2")
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self.add_mod(self.nand2)
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def route_vdd_gnd(self):
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""" Add a pin for each row of vdd/gnd which are must-connects next level up. """
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"""
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Add a pin for each row of vdd/gnd which
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are must-connects next level up.
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"""
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# Find the x offsets for where the vias/pins should be placed
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a_xoffset = self.nand_inst[0].rx()
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@ -86,7 +77,9 @@ class wordline_driver(design.design):
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# this will result in duplicate polygons for rails, but who cares
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# use the inverter offset even though it will be the nand's too
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(gate_offset, y_dir) = self.get_gate_offset(0, self.inv.height, num)
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(gate_offset, y_dir) = self.get_gate_offset(0,
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self.inv.height,
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num)
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# Route both supplies
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for name in ["vdd", "gnd"]:
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@ -97,8 +90,6 @@ class wordline_driver(design.design):
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pin_pos = vector(xoffset, supply_pin.cy())
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self.add_power_pin(name, pin_pos)
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def create_drivers(self):
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self.nand_inst = []
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self.inv2_inst = []
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@ -119,8 +110,7 @@ class wordline_driver(design.design):
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self.connect_inst(["wl_bar_{0}".format(row),
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"wl_{0}".format(row),
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"vdd", "gnd"])
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def place_drivers(self):
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nand2_xoffset = 2*self.m1_width + 5*self.m1_space
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inv2_xoffset = nand2_xoffset + self.nand2.width
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@ -136,8 +126,8 @@ class wordline_driver(design.design):
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y_offset = self.inv.height*row
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inst_mirror = "R0"
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nand2_offset=[nand2_xoffset, y_offset]
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inv2_offset=[inv2_xoffset, y_offset]
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nand2_offset = [nand2_xoffset, y_offset]
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inv2_offset = [inv2_xoffset, y_offset]
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# add nand 2
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self.nand_inst[row].place(offset=nand2_offset,
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@ -146,17 +136,16 @@ class wordline_driver(design.design):
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self.inv2_inst[row].place(offset=inv2_offset,
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mirror=inst_mirror)
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def route_layout(self):
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""" Route all of the signals """
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# Wordline enable connection
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en_pin=self.add_layout_pin(text="en",
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layer="metal2",
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offset=[self.m1_width + 2*self.m1_space,0],
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width=self.m2_width,
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height=self.height)
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en_offset = [self.m1_width + 2 * self.m1_space, 0]
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en_pin = self.add_layout_pin(text="en",
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layer="metal2",
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offset=en_offset,
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width=self.m2_width,
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height=self.height)
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for row in range(self.rows):
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nand_inst = self.nand_inst[row]
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@ -165,7 +154,7 @@ class wordline_driver(design.design):
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# en connection
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a_pin = nand_inst.get_pin("A")
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a_pos = a_pin.lc()
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clk_offset = vector(en_pin.bc().x,a_pos.y)
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clk_offset = vector(en_pin.bc().x, a_pos.y)
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self.add_segment_center(layer="metal1",
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start=clk_offset,
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end=a_pos)
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@ -183,10 +172,14 @@ class wordline_driver(design.design):
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# connect the decoder input pin to nand2 B
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b_pin = nand_inst.get_pin("B")
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b_pos = b_pin.lc()
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# needs to move down since B nand input is nearly aligned with A inv input
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up_or_down = self.m2_space if row%2 else -self.m2_space
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input_offset = vector(0,b_pos.y + up_or_down)
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mid_via_offset = vector(clk_offset.x,input_offset.y) + vector(0.5*self.m2_width+self.m2_space+0.5*contact.m1m2.width,0)
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# needs to move down since B nand input is
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# nearly aligned with A inv input
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up_or_down = self.m2_space if row % 2 else -self.m2_space
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input_offset = vector(0, b_pos.y + up_or_down)
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base_offset = vector(clk_offset.x, input_offset.y)
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contact_offset = vector(0.5 * self.m2_width + self.m2_space + 0.5 * contact.m1m2.width, 0)
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mid_via_offset = base_offset + contact_offset
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# must under the clk line in M1
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self.add_layout_pin_segment_center(text="in_{0}".format(row),
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layer="metal1",
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@ -194,24 +187,27 @@ class wordline_driver(design.design):
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end=mid_via_offset)
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self.add_via_center(layers=("metal1", "via1", "metal2"),
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offset=mid_via_offset,
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directions=("V","V"))
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directions=("V", "V"))
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# now connect to the nand2 B
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self.add_path("metal2", [mid_via_offset, b_pos])
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contact_offset = b_pos - vector(0.5 * contact.m1m2.height, 0)
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self.add_via_center(layers=("metal1", "via1", "metal2"),
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offset=b_pos - vector(0.5*contact.m1m2.height,0),
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directions=("H","H"))
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offset=contact_offset,
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directions=("H", "H"))
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# output each WL on the right
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wl_offset = inv2_inst.get_pin("Z").rc()
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self.add_layout_pin_segment_center(text="wl_{0}".format(row),
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layer="metal1",
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start=wl_offset,
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end=wl_offset-vector(self.m1_width,0))
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end=wl_offset - vector(self.m1_width, 0))
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def determine_wordline_stage_efforts(self, external_cout, inp_is_rise=True):
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"""Follows the clk_buf to a wordline signal adding each stages stage effort to a list"""
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"""
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Follows the clk_buf to a wordline signal adding
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each stages stage effort to a list.
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"""
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stage_effort_list = []
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stage1_cout = self.inv.get_cin()
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@ -225,7 +221,10 @@ class wordline_driver(design.design):
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return stage_effort_list
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def get_wl_en_cin(self):
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"""Get the relative capacitance of all the enable connections in the bank"""
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#The enable is connected to a nand2 for every row.
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"""
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Get the relative capacitance of all
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the enable connections in the bank
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"""
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# The enable is connected to a nand2 for every row.
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total_cin = self.nand2.get_cin() * self.rows
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return total_cin
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