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Vdd/gnd via stacks now use perferred directions, added cell property to override

This commit is contained in:
Joey Kunzler 2020-03-04 17:05:19 -08:00
parent 1617840ed3
commit d7529ce526
2 changed files with 73 additions and 61 deletions
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9
compiler/base/hierarchy_layout.py
View File

@ -1201,10 +1201,16 @@ class layout():
the given center location. The starting layer is specified to determine the given center location. The starting layer is specified to determine
which vias are needed. which vias are needed.
""" """
# Force vdd/gnd via stack to be vertically or horizontally oriented
# Default: None, uses prefered metal directions
if vertical: if vertical:
direction = ("V", "V") direction = ("V", "V")
else: elif not vertical and vertical is not None:
direction = ("H", "H") direction = ("H", "H")
else:
direction = None
via = self.add_via_stack_center(from_layer=start_layer, via = self.add_via_stack_center(from_layer=start_layer,
to_layer=self.pwr_grid_layer, to_layer=self.pwr_grid_layer,
@ -1390,4 +1396,3 @@ class layout():
debug.info(0, "name={0} : mod={1} : offset={2}".format(inst.name, debug.info(0, "name={0} : mod={1} : offset={2}".format(inst.name,
inst.mod.name, inst.mod.name,
inst.offset)) inst.offset))

11
compiler/modules/bitcell_base_array.py
View File

@ -101,13 +101,20 @@ class bitcell_base_array(design.design):
width=self.width, width=self.width,
height=wl_pin.height()) height=wl_pin.height())
# For every second row and column, add a via for gnd and vdd # For non-square via stacks, vertical/horizontal direction refers to the stack orientation in 2d space
# Default uses prefered directions for each layer; this cell property is only currently used by s8 tech (03/20)
try:
force_power_pins_vertical = cell_properties.bitcell_force_power_pins_vertical
except AttributeError:
force_power_pins_vertical = None
# Add vdd/gnd via stacks
for row in range(self.row_size): for row in range(self.row_size):
for col in range(self.column_size): for col in range(self.column_size):
inst = self.cell_inst[row,col] inst = self.cell_inst[row,col]
for pin_name in ["vdd", "gnd"]: for pin_name in ["vdd", "gnd"]:
for pin in inst.get_pins(pin_name): for pin in inst.get_pins(pin_name):
self.add_power_pin(name=pin_name, loc=pin.center(), vertical=True, start_layer=pin.layer) self.add_power_pin(name=pin_name, loc=pin.center(), vertical=force_power_pins_vertical, start_layer=pin.layer)
def _adjust_x_offset(self, xoffset, col, col_offset): def _adjust_x_offset(self, xoffset, col, col_offset):
tempx = xoffset tempx = xoffset