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Update pgate well and well contacts. 

Extend well left and right past a cell boundary.
Use asymmetric well contacts.
This commit is contained in:
mrg 2020-02-05 18:22:45 +00:00
parent 04d254542d
commit 596302d9a9
5 changed files with 25 additions and 25 deletions
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8
compiler/pgates/pgate.py
View File

@ -134,10 +134,10 @@ class pgate(design.design):
# Add a rail width to extend the well to the top of the rail # Add a rail width to extend the well to the top of the rail
nwell_max_offset = max(self.find_highest_layer_coords("nwell").y, nwell_max_offset = max(self.find_highest_layer_coords("nwell").y,
self.height + 0.5 * self.m1_width) self.height + 0.5 * self.m1_width)
nwell_position = middle_position nwell_position = middle_position - vector(self.well_extend_active, 0)
nwell_height = nwell_max_offset - middle_position.y nwell_height = nwell_max_offset - middle_position.y
self.add_rect(layer="nwell", self.add_rect(layer="nwell",
offset=middle_position, offset=nwell_position,
width=self.well_width, width=self.well_width,
height=nwell_height) height=nwell_height)
if "vtg" in layer: if "vtg" in layer:
@ -150,7 +150,7 @@ class pgate(design.design):
if "pwell" in layer: if "pwell" in layer:
pwell_min_offset = min(self.find_lowest_layer_coords("pwell").y, pwell_min_offset = min(self.find_lowest_layer_coords("pwell").y,
-0.5 * self.m1_width) -0.5 * self.m1_width)
pwell_position = vector(0, pwell_min_offset) pwell_position = vector(-self.well_extend_active, pwell_min_offset)
pwell_height = middle_position.y - pwell_position.y pwell_height = middle_position.y - pwell_position.y
self.add_rect(layer="pwell", self.add_rect(layer="pwell",
offset=pwell_position, offset=pwell_position,
@ -183,7 +183,6 @@ class pgate(design.design):
0.5 * pmos.active_contact.first_layer_height) 0.5 * pmos.active_contact.first_layer_height)
self.nwell_contact = self.add_via_center(layers=layer_stack, self.nwell_contact = self.add_via_center(layers=layer_stack,
offset=contact_offset, offset=contact_offset,
directions=("H", "V"),
implant_type="n", implant_type="n",
well_type="n") well_type="n")
self.add_rect_center(layer="m1", self.add_rect_center(layer="m1",
@ -237,7 +236,6 @@ class pgate(design.design):
0.5 * nmos.active_contact.first_layer_height) 0.5 * nmos.active_contact.first_layer_height)
self.pwell_contact= self.add_via_center(layers=layer_stack, self.pwell_contact= self.add_via_center(layers=layer_stack,
offset=contact_offset, offset=contact_offset,
directions=("H", "V"),
implant_type="p", implant_type="p",
well_type="p") well_type="p")
self.add_rect_center(layer="m1", self.add_rect_center(layer="m1",

18
compiler/pgates/pinv.py
View File

@ -52,10 +52,10 @@ class pinv(pgate.pgate):
def create_layout(self): def create_layout(self):
""" Calls all functions related to the generation of the layout """ """ Calls all functions related to the generation of the layout """
self.setup_layout_constants() self.setup_layout_constants()
self.route_supply_rails()
self.place_ptx() self.place_ptx()
self.add_well_contacts() self.add_well_contacts()
self.extend_wells(self.well_pos) self.extend_wells(self.well_pos)
self.route_supply_rails()
self.connect_rails() self.connect_rails()
self.route_input_gate(self.pmos_inst, self.route_input_gate(self.pmos_inst,
self.nmos_inst, self.nmos_inst,
@ -104,8 +104,9 @@ class pinv(pgate.pgate):
extra_contact_space = max(-nmos.get_pin("D").by(), 0) extra_contact_space = max(-nmos.get_pin("D").by(), 0)
# This is a poly-to-poly of a flipped cell # This is a poly-to-poly of a flipped cell
self.top_bottom_space = max(0.5*self.m1_width + self.m1_space + extra_contact_space, self.top_bottom_space = max(0.5*self.m1_width + self.m1_space + extra_contact_space,
self.poly_extend_active, self.poly_space) self.poly_extend_active + self.poly_space)
total_height = tx_height + min_channel + 2 * self.top_bottom_space total_height = tx_height + min_channel + 2 * self.top_bottom_space
debug.check(self.height > total_height, debug.check(self.height > total_height,
"Cell height {0} too small for simple min height {1}.".format(self.height, "Cell height {0} too small for simple min height {1}.".format(self.height,
total_height)) total_height))
@ -148,14 +149,15 @@ class pinv(pgate.pgate):
def setup_layout_constants(self): def setup_layout_constants(self):
""" """
Pre-compute some handy layout parameters. Compute the width and height
""" """
# the well width is determined the multi-finger PMOS device width plus # the width is determined the multi-finger PMOS device width plus
# the well contact width and half well enclosure on both sides # the well contact width, spacing between them
self.well_width = self.pmos.active_width + self.pmos.active_contact.width \ self.width = self.pmos.active_offset.x + self.pmos.active_width \
+ self.active_space + 2*self.nwell_enclose_active + contact.nwell_contact.width + self.active_space + 0.5 * self.nwell_enclose_active
self.width = self.well_width # This includes full enclosures on each end
self.well_width = self.width + 2*self.nwell_enclose_active
# Height is an input parameter, so it is not recomputed. # Height is an input parameter, so it is not recomputed.
def add_ptx(self): def add_ptx(self):

6
compiler/pgates/pnand2.py
View File

@ -98,11 +98,11 @@ class pnand2(pgate.pgate):
# Two PMOS devices and a well contact. Separation between each. # Two PMOS devices and a well contact. Separation between each.
# Enclosure space on the sides. # Enclosure space on the sides.
self.well_width = 2 * self.pmos.active_width + contact.active_contact.width \ self.width = 2 * self.pmos.active_width + contact.active_contact.width \
+ 2 * self.active_space \ + 2 * self.active_space \
+ 2 * self.nwell_enclose_active + 0.5 * self.nwell_enclose_active
self.width = self.well_width self.well_width = self.width + 2 * self.nwell_enclose_active
# Height is an input parameter, so it is not recomputed. # Height is an input parameter, so it is not recomputed.
# This is the extra space needed to ensure DRC rules # This is the extra space needed to ensure DRC rules

10
compiler/pgates/pnand3.py
View File

@ -91,10 +91,10 @@ class pnand3(pgate.pgate):
# Two PMOS devices and a well contact. Separation between each. # Two PMOS devices and a well contact. Separation between each.
# Enclosure space on the sides. # Enclosure space on the sides.
self.well_width = 3 * self.pmos.active_width + self.pmos.active_contact.width \ self.width = 3 * self.pmos.active_width + self.pmos.active_contact.width \
+ 2 * self.active_space + 2 * self.nwell_enclose_active \ + 2 * self.active_space + 0.5 * self.nwell_enclose_active \
- self.overlap_offset.x - self.overlap_offset.x
self.width = self.well_width self.well_width = self.width + 2 * self.nwell_enclose_active
# Height is an input parameter, so it is not recomputed. # Height is an input parameter, so it is not recomputed.
# This is the extra space needed to ensure DRC rules # This is the extra space needed to ensure DRC rules
@ -245,10 +245,10 @@ class pnand3(pgate.pgate):
offset=nmos3_pin.center()) offset=nmos3_pin.center())
# PMOS3 and NMOS3 are drain aligned # PMOS3 and NMOS3 are drain aligned
self.add_path("m2", [pmos3_pin.bc(), nmos3_pin.uc()]) self.add_path("m2", [pmos3_pin.center(), nmos3_pin.uc()])
# Route in the A input track (top track) # Route in the A input track (top track)
mid_offset = vector(nmos3_pin.center().x, self.inputA_yoffset) mid_offset = vector(nmos3_pin.center().x, self.inputA_yoffset)
self.add_path("m2", [pmos1_pin.bc(), mid_offset, nmos3_pin.uc()]) self.add_path("m2", [pmos1_pin.center(), mid_offset, nmos3_pin.uc()])
# This extends the output to the edge of the cell # This extends the output to the edge of the cell
self.add_via_center(layers=self.m1_stack, self.add_via_center(layers=self.m1_stack,

8
compiler/pgates/pnor2.py
View File

@ -95,11 +95,11 @@ class pnor2(pgate.pgate):
# Two PMOS devices and a well contact. Separation between each. # Two PMOS devices and a well contact. Separation between each.
# Enclosure space on the sides. # Enclosure space on the sides.
self.well_width = 2 * self.pmos.active_width \ self.width = 2 * self.pmos.active_width \
+ self.pmos.active_contact.width \ + self.pmos.active_contact.width \
+ 2 * self.active_space \ + 2 * self.active_space \
+ 2 * self.nwell_enclose_active + 0.5 * self.nwell_enclose_active
self.width = self.well_width self.well_width = self.width + 2 * self.nwell_enclose_active
# Height is an input parameter, so it is not recomputed. # Height is an input parameter, so it is not recomputed.
# This is the extra space needed to ensure DRC rules # This is the extra space needed to ensure DRC rules
@ -225,7 +225,7 @@ class pnor2(pgate.pgate):
# PMOS1 to mid-drain to NMOS2 drain # PMOS1 to mid-drain to NMOS2 drain
self.add_path("m2", self.add_path("m2",
[pmos_pin.bc(), mid2_offset, mid3_offset]) [pmos_pin.center(), mid2_offset, mid3_offset])
self.add_path("m2", self.add_path("m2",
[nmos_pin.rc(), mid1_offset, mid2_offset]) [nmos_pin.rc(), mid1_offset, mid2_offset])
# This extends the output to the edge of the cell # This extends the output to the edge of the cell