mirror of https://github.com/VLSIDA/OpenRAM.git
72 lines
2.5 KiB
Python
72 lines
2.5 KiB
Python
# See LICENSE for licensing information.
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#
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# Copyright (c) 2016-2021 Regents of the University of California and The Board
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# of Regents for the Oklahoma Agricultural and Mechanical College
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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 .rom_dummy_cell import rom_dummy_cell
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from openram.base import vector
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from openram import OPTS
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from openram.sram_factory import factory
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from openram.tech import drc
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class rom_base_cell(rom_dummy_cell):
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def __init__(self, name="", cell_name=None, add_source_contact=False, add_drain_contact=False, route_layer="m1"):
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super().__init__(name, cell_name, add_source_contact, add_drain_contact, route_layer)
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def create_netlist(self):
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self.add_pins()
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self.add_nmos()
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self.create_nmos()
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def create_layout(self):
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self.setup_drc_offsets()
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self.place_nmos()
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self.add_boundary()
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def create_nmos(self):
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self.cell_inst = self.add_inst( name=self.name + "_nmos",
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mod=self.nmos,
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)
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self.connect_inst(["bl_h", "wl", "bl_l", "gnd"])
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def add_pins(self):
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pin_list = ["bl_h", "bl_l", "wl", "gnd"]
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dir_list = ["INOUT", "INOUT", "INPUT", "GROUND"]
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self.add_pin_list(pin_list, dir_list)
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def place_nmos(self):
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# 0.5 * self.nmos.active_contact.width + self.nmos.active_contact_to_gate
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poly_offset = vector(self.poly_extend_active_spacing * 0.5 + self.nmos.height + 2 * self.poly_extend_active, self.nmos.width * 0.5 - 0.5 * self.nmos.contact_width - self.active_enclose_contact)
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# nmos_offset = vector(- 0.5 * self.nmos.contact_width - self.active_enclose_contact, self.nmos.poly_extend_active)
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print("{} poly spacing".format(self.poly_extend_active_spacing))
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nmos_offset = vector(self.nmos.poly_extend_active + self.nmos.height ,- 0.5 * self.nmos.contact_width - self.active_enclose_contact)
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# add rect of poly to account for offset from drc spacing
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self.add_rect_center("poly", poly_offset, self.poly_extend_active_spacing, self.nmos.poly_width)
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self.cell_inst.place(nmos_offset, rotate=90)
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# self.add_label("CELL ZERO", self.route_layer)
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self.copy_layout_pin(self.cell_inst, "S", "S")
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self.copy_layout_pin(self.cell_inst, "D", "D")
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self.source_pos = self.cell_inst.get_pin("S").center()
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