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tech: Make power_grid configurable

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this is the first step to allow engineers, porting technologies, more room
for routing their handmade cells.

For now, we don't allow the specification of power_grids where the lower layer
prefers to be routed vertically. This is due to the router not
connecting some pins properly in that case.

Signed-off-by: Bastian Koppelmann <[email protected]>
This commit is contained in:
Bastian Koppelmann
2020-01-28 12:06:34 +01:00
parent 90a4a72bba
commit 9749c522d1
3 changed files with 47 additions and 18 deletions
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compiler/base/hierarchy_layout.py
+18 -9
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@@ -39,6 +39,12 @@ class layout():
self.visited = [] # List of modules we have already visited
self.is_library_cell = False # Flag for library cells
self.gds_read()
try:
from tech import power_grid
self.pwr_grid_layer = power_grid[0]
except ImportError:
self.pwr_grid_layer = "m3"
############################################################
# GDS layout
@@ -1169,12 +1175,12 @@ class layout():
def copy_power_pins(self, inst, name):
"""
This will copy a power pin if it is on M3.
This will copy a power pin if it is on the lowest power_grid layer.
If it is on M1, it will add a power via too.
"""
pins = inst.get_pins(name)
for pin in pins:
if pin.layer == "m3":
if pin.layer == self.pwr_grid_layer:
self.add_layout_pin(name,
pin.layer,
pin.ll(),
@@ -1183,14 +1189,17 @@ class layout():
elif pin.layer == "m1":
self.add_power_pin(name, pin.center())
else:
debug.warning("{0} pins of {1} should be on metal3 or metal1 for supply router.".format(name,inst.name))
debug.warning("{0} pins of {1} should be on {2} or metal1 for "\
"supply router."
.format(name,inst.name,self.pwr_grid_layer))
def add_power_pin(self, name, loc, size=[1, 1], vertical=False, start_layer="m1"):
"""
Add a single power pin from M3 down to M1 at the given center location.
The starting layer is specified to determine which vias are needed.
Add a single power pin from the lowest power_grid layer down to M1 at
the given center location. The starting layer is specified to determine
which vias are needed.
"""
if vertical:
direction = ("V", "V")
@@ -1198,18 +1207,18 @@ class layout():
direction = ("H", "H")
via = self.add_via_stack_center(from_layer=start_layer,
to_layer="m3",
to_layer=self.pwr_grid_layer,
size=size,
offset=loc,
direction=direction)
if start_layer == "m3":
if start_layer == self.pwr_grid_layer:
self.add_layout_pin_rect_center(text=name,
layer="m3",
layer=self.pwr_grid_layer,
offset=loc)
else:
self.add_layout_pin_rect_center(text=name,
layer="m3",
layer=self.pwr_grid_layer,
offset=loc,
width=via.width,
height=via.height)