mirror of https://github.com/VLSIDA/OpenRAM.git
89 lines
2.8 KiB
Python
89 lines
2.8 KiB
Python
# See LICENSE for licensing information.
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#
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# Copyright (c) 2016-2019 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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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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from pin_layout import pin_layout
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from globals import OPTS
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from router import router
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class signal_router(router):
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"""
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A router class to read an obstruction map from a gds and plan a
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route on a given layer. This is limited to two layer routes.
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"""
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def __init__(self, layers, design, gds_filename=None):
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"""
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This will route on layers in design. It will get the blockages from
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either the gds file name or the design itself (by saving to a gds file).
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"""
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router.__init__(self, layers, design, gds_filename)
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def create_routing_grid(self):
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"""
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Create a sprase routing grid with A* expansion functions.
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"""
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# We will add a halo around the boundary
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# of this many tracks
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size = self.ur - self.ll
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debug.info(1,"Size: {0} x {1}".format(size.x,size.y))
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import signal_grid
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self.rg = signal_grid.signal_grid(self.ll, self.ur, self.track_width)
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def route(self, src, dest, detour_scale=5):
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"""
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Route a single source-destination net and return
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the simplified rectilinear path. Cost factor is how sub-optimal to explore for a feasible route.
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This is used to speed up the routing when there is not much detouring needed.
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"""
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debug.info(1,"Running signal router from {0} to {1}...".format(src,dest))
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self.pins[src] = []
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self.pins[dest] = []
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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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# 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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# Get the pin shapes
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self.find_pins_and_blockages([src, dest])
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# Block everything
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self.prepare_blockages()
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# Clear the pins we are routing
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self.set_blockages(self.pin_components[src],False)
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self.set_blockages(self.pin_components[dest],False)
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# Now add the src/tgt if they are not blocked by other shapes
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self.add_source(src)
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self.add_target(dest)
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if not self.run_router(detour_scale=detour_scale):
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self.write_debug_gds(stop_program=False)
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return False
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self.write_debug_gds(stop_program=False)
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return True
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