mirror of https://github.com/VLSIDA/OpenRAM.git
81 lines
2.6 KiB
Python
81 lines
2.6 KiB
Python
import design
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import debug
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from tech import drc
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from vector import vector
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from precharge import precharge
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class precharge_array(design.design):
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"""
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Dynamically generated precharge array of all bitlines. Cols is number
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of bit line columns, height is the height of the bit-cell array.
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"""
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def __init__(self, columns, size=1):
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design.design.__init__(self, "precharge_array")
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debug.info(1, "Creating {0}".format(self.name))
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self.columns = columns
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self.pc_cell = precharge(name="precharge", size=size)
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self.add_mod(self.pc_cell)
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self.width = self.columns * self.pc_cell.width
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self.height = self.pc_cell.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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"""Adds pins for spice file"""
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for i in range(self.columns):
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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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def create_layout(self):
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self.add_insts()
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self.add_layout_pins()
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def add_layout_pins(self):
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self.add_layout_pin(text="en",
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layer="metal1",
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offset=self.pc_cell.get_pin("en").ll(),
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width=self.width,
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height=drc["minwidth_metal1"])
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for inst in self.local_insts:
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self.copy_layout_pin(inst, "vdd")
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def add_insts(self):
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"""Creates a precharge array by horizontally tiling the precharge cell"""
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self.local_insts = []
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for i in range(self.columns):
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name = "pre_column_{0}".format(i)
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offset = vector(self.pc_cell.width * i, 0)
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inst = self.add_inst(name=name,
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mod=self.pc_cell,
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offset=offset)
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self.local_insts.append(inst)
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self.connect_inst(["bl[{0}]".format(i), "br[{0}]".format(i), "en", "vdd"])
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bl_pin = inst.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=drc["minwidth_metal2"],
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height=bl_pin.height())
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br_pin = inst.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=drc["minwidth_metal2"],
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height=bl_pin.height())
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