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Convert col decoder select routing to channel route.

This commit is contained in:
Matt Guthaus 2018-11-08 16:53:58 -08:00
parent e28978180f
commit 18fbf30b46
1 changed files with 9 additions and 19 deletions
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28
compiler/modules/bank.py
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@ -874,27 +874,17 @@ class bank(design.design):
decoder_name = "in_{}".format(i)
addr_name = "addr{0}_{1}".format(port,i)
self.copy_layout_pin(self.col_decoder_inst[port], decoder_name, addr_name)
# This will do a quick "river route" on two layers.
# When above the top select line it will offset "inward" again to prevent conflicts.
# This could be done on a single layer, but we follow preferred direction rules for later routing.
top_y_offset = self.col_mux_array_inst[port].get_pin("sel_{}".format(self.num_col_addr_lines-1)).cy()
for (decode_name,i) in zip(decode_names,range(self.num_col_addr_lines)):
mux_name = "sel_{}".format(i)
mux_addr_pos = self.col_mux_array_inst[port].get_pin(mux_name).lc()
decode_out_pos = self.col_decoder_inst[port].get_pin(decode_name).center()
offset = self.col_decoder_inst[port].lr() + vector(self.m2_pitch, 0)
# To get to the edge of the decoder and one track out
delta_offset = self.col_decoder_inst[port].rx() - decode_out_pos.x + self.m2_pitch
if decode_out_pos.y > top_y_offset:
mid1_pos = vector(decode_out_pos.x + delta_offset + i*self.m2_pitch,decode_out_pos.y)
else:
mid1_pos = vector(decode_out_pos.x + delta_offset + (self.num_col_addr_lines-i)*self.m2_pitch,decode_out_pos.y)
mid2_pos = vector(mid1_pos.x,mux_addr_pos.y)
#self.add_wire(("metal1","via1","metal2"),[decode_out_pos, mid1_pos, mid2_pos, mux_addr_pos])
self.add_path("metal1",[decode_out_pos, mid1_pos, mid2_pos, mux_addr_pos])
sel_names = ["sel_{}".format(x) for x in range(self.num_col_addr_lines)]
route_map = list(zip(decode_names, sel_names))
decode_pins = {key: self.col_decoder_inst[port].get_pin(key) for key in decode_names }
col_mux_pins = {key: self.col_mux_array_inst[port].get_pin(key) for key in sel_names }
# Combine the dff and bank pins into a single dictionary of pin name to pin.
all_pins = {**decode_pins, **col_mux_pins}
self.create_vertical_channel_route(route_map, all_pins, offset)
def add_lvs_correspondence_points(self):