mirror of https://github.com/VLSIDA/OpenRAM.git
147 lines
6.1 KiB
Python
147 lines
6.1 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.write_driver_chars = self.mod_write_driver.chars
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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.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_in[{0}]".format(i))
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if (self.words_per_row == 1):
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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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else:
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for i in range(self.word_size):
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self.add_pin("bl_out[{0}]".format(i * self.words_per_row))
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self.add_pin("br_out[{0}]".format(i * self.words_per_row))
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self.add_pin("wen")
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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.add_write_driver_module()
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self.setup_layout_constants()
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self.create_write_array()
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self.add_metal_rails()
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self.add_labels()
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self.offset_all_coordinates()
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def add_write_driver_module(self):
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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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def setup_layout_constants(self):
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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.gnd_positions = []
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self.vdd_positions = []
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self.wen_positions = []
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self.BL_out_positions = []
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self.BR_out_positions = []
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self.driver_positions = []
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self.Data_in_positions = []
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def create_write_array(self):
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for i in range(self.word_size):
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name = "Xwrite_driver%d" % i
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x_off = (i* self.driver.width * self.words_per_row)
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self.driver_positions.append(vector(x_off, 0))
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self.add_inst(name=name,
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mod=self.driver,
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offset=[x_off, 0])
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if (self.words_per_row == 1):
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self.connect_inst(["data_in[{0}]".format(i),
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"bl[{0}]".format(i),
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"br[{0}]".format(i),
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"wen", "vdd", "gnd"])
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else:
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self.connect_inst(["data_in[{0}]".format(i),
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"bl_out[{0}]".format(i * self.words_per_row),
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"br_out[{0}]".format(i * self.words_per_row),
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"wen", "vdd", "gnd"])
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def add_metal_rails(self):
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base = vector(0, - 0.5*drc["minwidth_metal1"])
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self.add_rect(layer="metal1",
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offset=base + vector(self.write_driver_chars["en"]).scale(0, 1),
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width=self.width - (self.words_per_row - 1) * self.driver.width,
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height=drc['minwidth_metal1'])
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self.add_rect(layer="metal1",
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offset=base + vector(self.write_driver_chars["vdd"]).scale(0, 1),
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width=self.width,
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height=drc['minwidth_metal1'])
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self.add_rect(layer="metal1",
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offset=base + vector(self.write_driver_chars["gnd"]).scale(0, 1),
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width=self.width,
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height=drc['minwidth_metal1'])
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def add_labels(self):
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for i in range(self.word_size):
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base = vector(i * self.driver.width * self.words_per_row, 0)
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BL_offset = base + self.write_driver_chars["BL"]
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BR_offset = base + self.write_driver_chars["BR"]
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self.add_label(text="data_in[{0}]".format(i),
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layer="metal2",
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offset=base + self.write_driver_chars["din"])
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if (self.words_per_row == 1):
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self.add_label(text="bl[{0}]".format(i),
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layer="metal2",
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offset=BL_offset)
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self.add_label(text="br[{0}]".format(i),
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layer="metal2",
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offset=BR_offset)
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else:
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self.add_label(text="bl_out[{0}]".format(i*self.words_per_row),
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layer="metal2",
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offset=BL_offset)
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self.add_label(text="br_out[{0}]".format(i*self.words_per_row),
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layer="metal2",
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offset=BR_offset)
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self.BL_out_positions.append(BL_offset)
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self.BR_out_positions.append(BR_offset)
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self.Data_in_positions.append(base + self.write_driver_chars["din"])
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base = vector(0, - 0.5 * drc["minwidth_metal1"])
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self.add_label(text="wen",
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layer="metal1",
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offset=base + vector(self.write_driver_chars["en"]).scale(0,1))
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self.add_label(text="vdd",
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layer="metal1",
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offset=base + vector(self.write_driver_chars["vdd"]).scale(0,1))
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self.add_label(text="gnd",
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layer="metal1",
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offset=base + vector(self.write_driver_chars["gnd"]).scale(0,1))
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self.wen_positions.append(base + vector(self.write_driver_chars["en"]).scale(0,1))
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self.vdd_positions.append(base + vector(self.write_driver_chars["vdd"]).scale(0,1))
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self.gnd_positions.append(base + vector(self.write_driver_chars["gnd"]).scale(0,1))
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self.add_label(text="WRITE DRIVER",
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layer="text",
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offset=[self.width / 2.0,
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self.height / 2.0])
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