mirror of https://github.com/VLSIDA/OpenRAM.git
141 lines
3.9 KiB
Python
141 lines
3.9 KiB
Python
import gdsMill
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import tech
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from contact import contact
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import math
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import debug
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import grid
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from pin_layout import pin_layout
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from vector import vector
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from vector3d import vector3d
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from globals import OPTS
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from router import router
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class supply_router(router):
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"""
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A router class to read an obstruction map from a gds and
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routes a grid to connect the supply on the two layers.
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"""
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def __init__(self, gds_name):
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"""Use the gds file for the blockages with the top module topName and
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layers for the layers to route on
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"""
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router.__init__(self, gds_name)
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self.pins = {}
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def clear_pins(self):
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"""
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Convert the routed path to blockages.
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Keep the other blockages unchanged.
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"""
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self.pins = {}
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self.rg.reinit()
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def route(self, cell, layers, vdd_name="vdd", gnd_name="gnd"):
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"""
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Route a single source-destination net and return
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the simplified rectilinear path.
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"""
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self.cell = cell
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self.pins[vdd_name] = []
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self.pins[gnd_name] = []
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# Clear the pins if we have previously routed
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if (hasattr(self,'rg')):
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self.clear_pins()
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else:
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# Set up layers and track sizes
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self.set_layers(layers)
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# Creat a routing grid over the entire area
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# FIXME: This could be created only over the routing region,
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# but this is simplest for now.
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self.create_routing_grid()
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# This will get all shapes as blockages
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self.find_blockages()
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# Get the pin shapes
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self.get_pin(vdd_name)
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self.get_pin(gnd_name)
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# Now add the blockages (all shapes except the src/tgt pins)
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self.add_blockages()
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# Add blockages from previous routes
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self.add_path_blockages()
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# Now add the src/tgt if they are not blocked by other shapes
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self.add_pin(vdd_name,True)
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#self.add_pin()
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# returns the path in tracks
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(path,cost) = self.rg.route(detour_scale)
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if path:
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debug.info(1,"Found path: cost={0} ".format(cost))
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debug.info(2,str(path))
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self.add_route(path)
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return True
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else:
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self.write_debug_gds()
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# clean up so we can try a reroute
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self.clear_pins()
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return False
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def add_route(self,path):
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"""
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Add the current wire route to the given design instance.
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"""
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debug.info(3,"Set path: " + str(path))
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# Keep track of path for future blockages
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self.paths.append(path)
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# This is marked for debug
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self.rg.add_path(path)
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# For debugging... if the path failed to route.
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if False or path==None:
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self.write_debug_gds()
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# First, simplify the path for
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#debug.info(1,str(self.path))
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contracted_path = self.contract_path(path)
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debug.info(1,str(contracted_path))
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# convert the path back to absolute units from tracks
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abs_path = map(self.convert_point_to_units,contracted_path)
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debug.info(1,str(abs_path))
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self.cell.add_route(self.layers,abs_path)
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##########################
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# Gridded supply route functions
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##########################
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def create_grid(self, ll, ur):
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""" Create alternating vdd/gnd lines horizontally """
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self.create_horizontal_grid()
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self.create_vertical_grid()
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def create_horizontal_grid(self):
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""" Create alternating vdd/gnd lines horizontally """
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pass
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def create_vertical_grid(self):
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""" Create alternating vdd/gnd lines horizontally """
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pass
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def route(self):
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#self.create_grid()
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pass
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