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fix remaining lvs issues by adding an offset to pins gotten from subinstances and appropriately grounding wls in cap cells

This commit is contained in:
samuelkcrow 2023-01-16 17:54:17 -08:00
parent 29c79abaf8
commit b5cddb9394
1 changed files with 14 additions and 13 deletions
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27
compiler/modules/capped_bitcell_array.py
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@ -168,10 +168,11 @@ class capped_bitcell_array(bitcell_base_array):
self.used_wordline_names = self.replica_bitcell_array.used_wordline_names self.used_wordline_names = self.replica_bitcell_array.used_wordline_names
self.unused_wordline_names = self.replica_bitcell_array.unused_wordline_names self.unused_wordline_names = self.replica_bitcell_array.unused_wordline_names
self.replica_array_wordline_names = self.replica_bitcell_array.all_wordline_names self.replica_array_wordline_names = self.replica_bitcell_array.all_wordline_names
self.replica_array_wordline_names_with_grounded_wls = ["gnd" if x in self.unused_wordline_names else x for x in self.replica_array_wordline_names]
self.all_wordline_names = [] self.all_wordline_names = []
self.all_wordline_names.extend(["gnd"] * len(self.col_cap_top.get_wordline_names())) self.all_wordline_names.extend(["gnd"] * len(self.col_cap_top.get_wordline_names()))
self.all_wordline_names.extend(self.replica_array_wordline_names) self.all_wordline_names.extend(self.replica_array_wordline_names_with_grounded_wls)
self.all_wordline_names.extend(["gnd"] * len(self.col_cap_bottom.get_wordline_names())) self.all_wordline_names.extend(["gnd"] * len(self.col_cap_bottom.get_wordline_names()))
self.add_pin_list(self.used_wordline_names, "INPUT") self.add_pin_list(self.used_wordline_names, "INPUT")
@ -183,7 +184,7 @@ class capped_bitcell_array(bitcell_base_array):
# Main array # Main array
self.replica_bitcell_array_inst=self.add_inst(name="replica_bitcell_array", self.replica_bitcell_array_inst=self.add_inst(name="replica_bitcell_array",
mod=self.replica_bitcell_array) mod=self.replica_bitcell_array)
self.connect_inst(self.replica_array_bitline_names + ["gnd" if x in self.unused_wordline_names else x for x in self.replica_array_wordline_names] + self.supplies) self.connect_inst(self.replica_array_bitline_names + self.replica_array_wordline_names_with_grounded_wls + self.supplies)
# Top/bottom dummy rows or col caps # Top/bottom dummy rows or col caps
self.dummy_row_insts = [] self.dummy_row_insts = []
@ -226,8 +227,8 @@ class capped_bitcell_array(bitcell_base_array):
# Array was at (0, 0) but move everything so it is at the lower left # Array was at (0, 0) but move everything so it is at the lower left
# We move DOWN the number of left RBL even if we didn't add the column to this bitcell array # We move DOWN the number of left RBL even if we didn't add the column to this bitcell array
# Note that this doesn't include the row/col cap # Note that this doesn't include the row/col cap
array_offset = self.bitcell_offset.scale(len(self.left_rbl), self.rbl[0]) self.array_offset = self.bitcell_offset.scale(len(self.left_rbl), self.rbl[0])
self.translate_all(array_offset.scale(-1, -1)) self.translate_all(self.array_offset.scale(-1, -1))
# Add extra width on the left and right for the unused WLs # Add extra width on the left and right for the unused WLs
@ -387,8 +388,8 @@ class capped_bitcell_array(bitcell_base_array):
for (wl_name, pin_name) in zip(names, self.replica_bitcell_array.dummy_row.get_wordline_names()): for (wl_name, pin_name) in zip(names, self.replica_bitcell_array.dummy_row.get_wordline_names()):
if wl_name in self.unused_wordline_names: if wl_name in self.unused_wordline_names:
pin = inst.get_pin(pin_name) pin = inst.get_pin(pin_name)
self.connect_side_pin(pin, "left", self.left_gnd_locs[0].x) self.connect_side_pin(pin, "left", self.left_gnd_locs[0].x, self.array_offset)
self.connect_side_pin(pin, "right", self.right_gnd_locs[0].x) self.connect_side_pin(pin, "right", self.right_gnd_locs[0].x, self.array_offset)
def route_side_pin(self, name, side, offset_multiple=1): def route_side_pin(self, name, side, offset_multiple=1):
""" """
@ -458,23 +459,23 @@ class capped_bitcell_array(bitcell_base_array):
return (left_loc, right_loc) return (left_loc, right_loc)
def connect_side_pin(self, pin, side, offset): def connect_side_pin(self, pin, side, offset, inst_offset=vector(0, 0)):
""" """
Used to connect horizontal layers of pins to the left/right straps Used to connect horizontal layers of pins to the left/right straps
locs provides the offsets of the pin strip end points. locs provides the offsets of the pin strip end points.
""" """
if side in ["left", "right"]: if side in ["left", "right"]:
self.connect_vertical_side_pin(pin, side, offset) self.connect_vertical_side_pin(pin, side, offset, inst_offset)
elif side in ["top", "bottom", "bot"]: elif side in ["top", "bottom", "bot"]:
self.connect_horizontal_side_pin(pin, side, offset) self.connect_horizontal_side_pin(pin, side, offset, inst_offset)
else: else:
debug.error("Invalid side {}".format(side), -1) debug.error("Invalid side {}".format(side), -1)
def connect_horizontal_side_pin(self, pin, side, yoffset): def connect_horizontal_side_pin(self, pin, side, yoffset, inst_offset=vector(0, 0)):
""" """
Used to connect vertical layers of pins to the top/bottom horizontal straps Used to connect vertical layers of pins to the top/bottom horizontal straps
""" """
cell_loc = pin.center() cell_loc = pin.center() + inst_offset
pin_loc = vector(cell_loc.x, yoffset) pin_loc = vector(cell_loc.x, yoffset)
# Place the pins a track outside of the array # Place the pins a track outside of the array
@ -487,11 +488,11 @@ class capped_bitcell_array(bitcell_base_array):
self.add_path(pin.layer, [cell_loc, pin_loc]) self.add_path(pin.layer, [cell_loc, pin_loc])
def connect_vertical_side_pin(self, pin, side, xoffset): def connect_vertical_side_pin(self, pin, side, xoffset, inst_offset=vector(0, 0)):
""" """
Used to connect vertical layers of pins to the top/bottom vertical straps Used to connect vertical layers of pins to the top/bottom vertical straps
""" """
cell_loc = pin.center() cell_loc = pin.center() + inst_offset
pin_loc = vector(xoffset, cell_loc.y) pin_loc = vector(xoffset, cell_loc.y)
# Place the pins a track outside of the array # Place the pins a track outside of the array