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Fix supply rail step size to place alternating rails

This commit is contained in:
Matt Guthaus 2018-10-15 13:58:40 -07:00
parent e2cfd382b9
commit 5cb3a24b19
1 changed files with 11 additions and 10 deletions
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21
compiler/router/supply_router.py
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@ -72,8 +72,9 @@ class supply_router(router):
#self.write_debug_gds("pre_pin_debug.gds",stop_program=True)
# Route the supply pins to the supply rails
self.route_pins_to_rails(gnd_name)
# Route vdd first since we want it to be shorter
self.route_pins_to_rails(vdd_name)
self.route_pins_to_rails(gnd_name)
#self.write_debug_gds("post_pin_debug.gds",stop_program=False)
@ -155,21 +156,22 @@ class supply_router(router):
# space
track_pitch = self.rail_track_width*width + space
self.supply_rail_step = math.ceil(track_pitch/self.track_width)
debug.info(1,"Rail step: {}".format(self.supply_rail_step))
self.supply_rail_width = math.ceil(track_pitch/self.track_width)
debug.info(1,"Rail step: {}".format(self.supply_rail_width))
def compute_supply_rails(self, name, start_offset):
def compute_supply_rails(self, name, supply_number):
"""
Compute the unblocked locations for the horizontal and vertical supply rails.
Go in a raster order from bottom to the top (for horizontal) and left to right
(for vertical). Start with an initial start_offset in x and y direction.
"""
start_offset = supply_number*self.supply_rail_width
# Horizontal supply rails
for offset in range(start_offset, self.max_yoffset, self.supply_rail_step):
for offset in range(start_offset, self.max_yoffset, 2*self.supply_rail_width):
# Seed the function at the location with the given width
wave = [vector3d(0,offset+i,0) for i in range(self.supply_rail_step)]
wave = [vector3d(0,offset+i,0) for i in range(self.supply_rail_width)]
# While we can keep expanding east in this horizontal track
while wave and wave[0].x < self.max_xoffset:
wave = self.find_supply_rail(name, wave, direction.EAST)
@ -177,9 +179,9 @@ class supply_router(router):
# Vertical supply rails
max_offset = self.rg.ur.x
for offset in range(start_offset, self.max_xoffset, self.supply_rail_step):
for offset in range(start_offset, self.max_xoffset, 2*self.supply_rail_width):
# Seed the function at the location with the given width
wave = [vector3d(offset+i,0,1) for i in range(self.supply_rail_step)]
wave = [vector3d(offset+i,0,1) for i in range(self.supply_rail_width)]
# While we can keep expanding north in this vertical track
while wave and wave[0].y < self.max_yoffset:
wave = self.find_supply_rail(name, wave, direction.NORTH)
@ -234,8 +236,7 @@ class supply_router(router):
self.compute_supply_rail_dimensions()
# Compute the grid locations of the supply rails
start_offset = supply_number*self.rail_track_width
self.compute_supply_rails(name, start_offset)
self.compute_supply_rails(name, supply_number)
# Add the supply rail vias (and prune disconnected rails)
self.connect_supply_rails(name)