mirror of https://github.com/VLSIDA/OpenRAM.git
109 lines
3.7 KiB
Python
109 lines
3.7 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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class rom_poly_tap(design):
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def __init__(self, name="", strap_length=0, cell_name=None, prop=None, tx_type="nmos", strap_layer="m1"):
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super().__init__(name, cell_name, prop)
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self.strap_layer=strap_layer
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self.length = strap_length
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self.tx_type = tx_type
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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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#for layout constants
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self.dummy = factory.create(module_type="rom_dummy_cell")
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self.pmos = factory.create(module_type="ptx", tx_type="pmos")
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def create_layout(self):
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self.place_via()
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# if self.tx_type == "pmos":
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self.extend_poly()
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self.add_boundary()
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if self.length != 0:
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self.place_strap()
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def add_boundary(self):
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contact_width = self.poly_contact.width + 2 * self.contact_x_offset
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offset = self.active_space - (contact_width - self.active_enclose_contact - self.active_extend_contact)
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print("THINGY {}".format(offset))
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self.height = self.dummy.height
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self.width = contact_width + self.pitch_offset
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print("poly height: {0}, width: {1}".format(self.height, self.width))
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super().add_boundary()
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def place_via(self):
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contact_width = self.poly_contact.width
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# DRC rule here is hard coded since licon.9 isnt included in skywater130 tech file
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# poly contact spacing to P-diffusion < 0.235um (licon.9 + psdm.5a)
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if OPTS.tech_name == "sky130":
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self.contact_x_offset = 0.235 - (contact_width - self.pmos.contact_width) * 0.5 - self.poly_extend_active
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else:
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assert(False)
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if self.tx_type == "nmos":
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contact_y = self.dummy.poly.cy()
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# contact_y = self.dummy.poly.offset.x + (self.poly_width * 0.5)
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# self.contact_x_offset = 0
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else:
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contact_y = self.pmos.poly_positions[0].x - self.pmos.active_offset.x
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# contact_x = - contact_width * 0.5 - self.contact_x_offset
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contact_x = contact_width * 0.5 + self.contact_x_offset
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self.contact_offset = vector(contact_x, contact_y)
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self.via = self.add_via_stack_center(from_layer="poly",
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to_layer=self.strap_layer,
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offset=self.contact_offset)
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self.add_layout_pin_rect_center("via", self.strap_layer, self.contact_offset)
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def place_strap(self):
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strap_start = vector(self.via.lx() , self.via.cy())
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strap_end = vector( self.dummy.width * (self.length + 1), self.via.cy())
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self.strap = self.add_path(self.strap_layer, (strap_start, strap_end))
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def extend_poly(self):
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base_contact_width = self.poly_contact.width + 2 * self.contact_x_offset
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self.pitch_offset = (base_contact_width - self.active_enclose_contact - self.active_extend_contact) - self.active_space
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poly_x = self.poly_contact.width + self.contact_x_offset
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poly_y = self.contact_offset.y - self.poly_width * 0.5
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extend_offset = vector(poly_x, poly_y)
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self.add_rect("poly", extend_offset, self.contact_x_offset + self.pitch_offset, self.poly_width)
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poly_x = 0
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extend_offset = vector(poly_x, poly_y)
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self.add_rect("poly", extend_offset, self.contact_x_offset , self.poly_width)
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