mirror of https://github.com/VLSIDA/OpenRAM.git
88 lines
2.7 KiB
Python
88 lines
2.7 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 openram.base import design
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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_dummy_cell(design):
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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)
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self.route_layer = route_layer
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self.add_source_contact="li"
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self.add_drain_contact="li"
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self.create_netlist()
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self.create_layout()
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def create_netlist(self):
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#creates nmos for layout dimensions
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self.add_nmos()
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#set height and width such that the cell will tile perfectly by only ofsetting in the array by its width and height
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def create_layout(self):
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self.setup_drc_offsets()
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self.add_boundary()
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self.add_poly()
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self.add_metal()
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#self.add_label("0,0", self.route_layer)
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def add_poly(self):
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poly_x = 0.5 * (self.nmos.poly_height + self.poly_extend_active_spacing)
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# 0.5 * self.nmos.contact_width + self.contact_to_gate
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self.poly = self.add_rect_center("poly", vector(poly_x, self.base_width * 0.5), 2 * poly_x, self.poly_width)
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def add_metal(self):
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if self.route_layer == "li":
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via = "mcon"
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else:
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via = "via{}".format(self.route_layer[len(self.route_layer) - 1])
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wire_y = self.height + drc["minwidth_{}".format(via)] * 0.5
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wire_x = 0.5 * (self.width - self.poly_extend_active_spacing)
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wire_start = vector( wire_x, 0)
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wire_end = vector(wire_x, wire_y)
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# if self.route_layer == 'm1':
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# if self.drain_contact:
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# self.add_via_center(self.li_stack, [wire_x, wire_y])
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# if self.source_contact:
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# self.add_via_center(self.li_stack, [self.width, wire_y])
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self.add_path(self.route_layer, [wire_start, wire_end])
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# drain_x = 0
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# drain_y = 0.5 * (self.width)
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source_x = 0.5 * (self.width - self.poly_extend_active_spacing)
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source_y = 0
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source_pos = vector(source_x, source_y)
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self.add_layout_pin_rect_center("S", self.route_layer, source_pos)
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drain_pos = vector(source_x, self.height)
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self.add_layout_pin_rect_center("D", self.route_layer, drain_pos)
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