mirror of https://github.com/VLSIDA/OpenRAM.git
134 lines
5.3 KiB
Python
134 lines
5.3 KiB
Python
# See LICENSE for licensing information.
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#
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# Copyright (c) 2016-2023 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.tech import drc
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from openram.tech import layer as techlayer
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from .design import design
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from .utils import snap_to_grid
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from .vector import vector
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def create_rectilinear_route(my_list):
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""" Add intermediate nodes if it isn't rectilinear. Also skip
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repeated nodes. Also, convert to vector if the aren't."""
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pl = [snap_to_grid(x) for x in my_list]
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my_list = []
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for index in range(len(pl) - 1):
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if pl[index] != pl[index + 1]:
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my_list.append(vector(pl[index]))
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if (pl[index][0] != pl[index + 1][0]) and (pl[index][1] != pl[index + 1][1]):
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my_list.append(vector(pl[index][0], pl[index + 1][1]))
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my_list.append(vector(pl[-1]))
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return my_list
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class wire_path():
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"""
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Object metal wire_path; given the layer type
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Add a wire_path of minimium metal width between a set of points.
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The points should be rectilinear to control the bend points. If
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not, it will always go down first. The points are the center of the wire_path.
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If width is not given, it uses minimum layer width.
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"""
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def __init__(self, obj, layer, position_list, width=None):
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self.obj = obj
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self.layer_name = layer
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self.layer_id = techlayer[layer]
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if width == None:
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self.layer_width = drc["minwidth_{0}".format(layer)]
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else:
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self.layer_width = width
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self.position_list = position_list
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self.pins = [] # used for matching parm lengths
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self.switch_pos_list = []
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self.create_layout()
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def create_layout(self):
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self.create_rectilinear()
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self.connect_corner()
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self.create_rectangles()
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# wires and wire_paths should not be offset to (0,0)
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def create_rectilinear(self):
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""" Add intermediate nodes if it isn't rectilinear. Also skip
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repeated nodes. Also, convert to vector if the aren't."""
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self.position_list = create_rectilinear_route(self.position_list)
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def connect_corner(self):
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""" Add a corner square at every corner of the wire_path."""
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from itertools import tee, islice
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nwise = lambda g, n=2: zip(*(islice(g, i, None) for i, g in enumerate(tee(g, n))))
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threewise=nwise(self.position_list, 3)
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for (a, offset, c) in list(threewise):
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# add a exceptions to prevent a corner when we retrace back in the same direction
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if a[0] == c[0]:
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continue
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if a[1] == c[1]:
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continue
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corner_offset = [offset[0] - 0.5 * self.layer_width,
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offset[1] - 0.5 * self.layer_width]
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self.draw_corner_wire(corner_offset)
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def draw_corner_wire(self, offset):
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""" This function adds the corner squares since the center
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line convention only draws to the center of the corner."""
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self.obj.add_rect(layer=self.layer_name,
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offset=offset,
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width=self.layer_width,
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height=self.layer_width)
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def create_rectangles(self):
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""" Create the actual rectangles on teh appropriate layers
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using the position list of the corners. """
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pl = self.position_list # position list
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for index in range(len(pl) - 1):
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# if we have x motion
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if pl[index][0] != pl[index + 1][0]:
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line_length = pl[index + 1][0] - pl[index][0]
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offset = [pl[index][0],
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pl[index][1] - 0.5 * self.layer_width]
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if line_length < 0:
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offset = [offset[0] + line_length,
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offset[1]]
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self.add_line(layer_name=self.layer_name,
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length=abs(line_length),
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offset=offset,
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orientation="horizontal",
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layer_width=self.layer_width)
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# if we have y motion
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elif pl[index][1] != pl[index + 1][1]:
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line_length = pl[index + 1][1] - pl[index][1]
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offset = [pl[index][0] - 0.5 * self.layer_width,
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pl[index][1]]
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if line_length < 0:
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offset = [offset[0],
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offset[1] + line_length]
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self.add_line(layer_name=self.layer_name,
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length=abs(line_length),
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offset=offset,
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orientation="vertical",
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layer_width=self.layer_width)
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def add_line(self, layer_name, length, offset, orientation, layer_width):
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"""
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straight line object with layer_minwidth
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(orientation: "vertical" or "horizontal") default is vertical
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"""
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width = layer_width
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height = length
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if orientation == "horizontal":
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width = length
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height = layer_width
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self.obj.add_rect(layer=layer_name,
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offset=offset,
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width=width,
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height=height)
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