mirror of https://github.com/VLSIDA/OpenRAM.git
106 lines
4.1 KiB
Python
106 lines
4.1 KiB
Python
from math import log
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import design
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from tech import drc
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import debug
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from vector import vector
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from globals import OPTS
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class write_driver_array(design.design):
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"""
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Array of tristate drivers to write to the bitlines through the column mux.
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Dynamically generated write driver array of all bitlines.
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"""
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def __init__(self, columns, word_size):
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design.design.__init__(self, "write_driver_array")
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debug.info(1, "Creating {0}".format(self.name))
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c = reload(__import__(OPTS.config.write_driver))
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self.mod_write_driver = getattr(c, OPTS.config.write_driver)
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self.driver = self.mod_write_driver("write_driver")
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self.add_mod(self.driver)
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self.columns = columns
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self.word_size = word_size
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self.words_per_row = columns / word_size
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self.width = self.columns * self.driver.width
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self.height = self.height = self.driver.height
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self.add_pins()
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self.create_layout()
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self.DRC_LVS()
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def add_pins(self):
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for i in range(self.word_size):
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self.add_pin("data[{0}]".format(i))
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for i in range(self.word_size):
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self.add_pin("bl[{0}]".format(i))
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self.add_pin("br[{0}]".format(i))
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self.add_pin("en")
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self.add_pin("vdd")
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self.add_pin("gnd")
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def create_layout(self):
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self.create_write_array()
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self.add_layout_pins()
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def create_write_array(self):
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self.driver_insts = {}
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for i in range(0,self.columns,self.words_per_row):
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name = "Xwrite_driver{}".format(i)
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base = vector(i * self.driver.width,0)
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self.driver_insts[i/self.words_per_row]=self.add_inst(name=name,
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mod=self.driver,
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offset=base)
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self.connect_inst(["data[{0}]".format(i/self.words_per_row),
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"bl[{0}]".format(i/self.words_per_row),
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"br[{0}]".format(i/self.words_per_row),
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"en", "vdd", "gnd"])
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def add_layout_pins(self):
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for i in range(self.word_size):
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din_pin = self.driver_insts[i].get_pin("din")
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self.add_layout_pin(text="data[{0}]".format(i),
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layer="metal2",
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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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bl_pin = self.driver_insts[i].get_pin("BL")
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self.add_layout_pin(text="bl[{0}]".format(i),
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layer="metal2",
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offset=bl_pin.ll(),
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width=bl_pin.width(),
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height=bl_pin.height())
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br_pin = self.driver_insts[i].get_pin("BR")
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self.add_layout_pin(text="br[{0}]".format(i),
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layer="metal2",
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offset=br_pin.ll(),
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width=br_pin.width(),
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height=br_pin.height())
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self.add_layout_pin(text="en",
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layer="metal1",
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offset=self.driver_insts[0].get_pin("en").ll().scale(0,1),
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width=self.width,
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height=drc['minwidth_metal1'])
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self.add_layout_pin(text="vdd",
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layer="metal1",
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offset=self.driver_insts[0].get_pin("vdd").ll().scale(0,1),
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width=self.width,
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height=drc['minwidth_metal1'])
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self.add_layout_pin(text="gnd",
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layer="metal1",
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offset=self.driver_insts[0].get_pin("gnd").ll().scale(0,1),
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width=self.width,
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height=drc['minwidth_metal1'])
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