mirror of https://github.com/VLSIDA/OpenRAM.git
Cleanup and simplify ptx for multiple technologies
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mrg
parent
585a708e0c
commit
254e584e35
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@ -10,6 +10,7 @@ import debug
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from tech import layer, drc, spice
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from vector import vector
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from sram_factory import factory
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import contact
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class ptx(design.design):
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@ -28,6 +29,7 @@ class ptx(design.design):
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tx_type="nmos",
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connect_active=False,
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connect_poly=False,
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series_devices=False,
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num_contacts=None):
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# We need to keep unique names because outputting to GDSII
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# will use the last record with a given name. I.e., you will
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@ -50,6 +52,7 @@ class ptx(design.design):
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self.tx_width = width
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self.connect_active = connect_active
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self.connect_poly = connect_poly
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self.series_devices = series_devices
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self.num_contacts = num_contacts
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# Since it has variable height, it is not a pgate.
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@ -127,27 +130,25 @@ class ptx(design.design):
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directions=("V", "V"),
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dimensions=(1, self.num_contacts))
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# The contacted poly pitch
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self.poly_pitch = max(2 * self.contact_to_gate + self.contact_width + self.poly_width,
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self.poly_space)
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# The contacted poly pitch
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self.contact_spacing = 2 * self.contact_to_gate + \
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self.contact_width + self.poly_width
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# This is measured because of asymmetric enclosure rules
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active_enclose_contact = 0.5*(self.active_contact.width - self.contact_width)
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# This is the extra poly spacing due to the poly contact to poly contact pitch
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# of contacted gates
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extra_poly_contact_width = contact.poly_contact.width - self.poly_width
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# This is the distance from the side of
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# poly gate to the contacted end of active
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# (i.e. the "outside" contacted diffusion sizes)
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self.end_to_poly = self.active_contact.width - active_enclose_contact + \
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self.contact_to_gate
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# This is the spacing between S/D contacts
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# This is the spacing between the poly gates
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self.min_poly_pitch = self.poly_space + self.poly_width
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self.contacted_poly_pitch = self.poly_space + contact.poly_contact.width
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self.contact_pitch = 2 * self.contact_to_gate + self.poly_width + self.contact_width
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self.poly_pitch = max(self.min_poly_pitch,
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self.contacted_poly_pitch,
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self.contact_pitch)
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self.end_to_contact = 0.5 * self.active_contact.width
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# Active width is determined by enclosure on both ends and contacted pitch,
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# at least one poly and n-1 poly pitches
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self.active_width = 2 * self.end_to_poly + self.poly_width + \
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(self.mults - 1) * self.poly_pitch
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self.active_width = 2 * self.end_to_contact + self.active_contact.width \
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+ 2 * self.contact_to_gate + self.poly_width + (self.mults - 1) * self.poly_pitch
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# Active height is just the transistor width
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self.active_height = self.tx_width
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@ -287,12 +288,11 @@ class ptx(design.design):
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Add the poly gates(s) and (optionally) connect them.
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"""
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# poly is one contacted spacing from the end and down an extension
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poly_offset = self.active_offset \
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+ vector(self.poly_width, self.poly_height).scale(0.5, 0.5) \
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+ vector(self.end_to_poly, -self.poly_extend_active)
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poly_offset = self.contact_offset \
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+ vector(0.5 * self.active_contact.width + 0.5 * self.poly_width + self.contact_to_gate, 0)
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# poly_positions are the bottom center of the poly gates
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poly_positions = []
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self.poly_positions = []
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# It is important that these are from left to right,
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# so that the pins are in the right
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@ -309,11 +309,11 @@ class ptx(design.design):
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offset=poly_offset,
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height=self.poly_height,
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width=self.poly_width)
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poly_positions.append(poly_offset)
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self.poly_positions.append(poly_offset)
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poly_offset = poly_offset + vector(self.poly_pitch,0)
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if self.connect_poly:
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self.connect_fingered_poly(poly_positions)
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self.connect_fingered_poly(self.poly_positions)
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def add_active(self):
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"""
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@ -362,59 +362,74 @@ class ptx(design.design):
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"""
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return 1
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def get_contact_positions(self):
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"""
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Create a list of the centers of drain and source contact positions.
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"""
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# The first one will always be a source
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source_positions = [self.contact_offset]
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drain_positions = []
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# It is important that these are from left to right,
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# so that the pins are in the right
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# order for the accessors.
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for i in range(self.mults):
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if i%2:
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# It's a source... so offset from previous drain.
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source_positions.append(drain_positions[-1] + vector(self.contact_spacing, 0))
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else:
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# It's a drain... so offset from previous source.
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drain_positions.append(source_positions[-1] + vector(self.contact_spacing, 0))
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return [source_positions,drain_positions]
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def add_active_contacts(self):
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"""
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Add the active contacts to the transistor.
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"""
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drain_positions = []
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source_positions = []
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[source_positions,drain_positions] = self.get_contact_positions()
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for pos in source_positions:
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contact=self.add_via_center(layers=self.active_stack,
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# First one is always a SOURCE
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label = "S"
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pos = self.contact_offset
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contact=self.add_via_center(layers=self.active_stack,
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offset=pos,
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size=(1, self.num_contacts),
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directions=("V","V"),
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implant_type=self.implant_type,
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well_type=self.well_type)
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self.add_layout_pin_rect_center(text=label,
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layer="m1",
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offset=pos,
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size=(1, self.num_contacts),
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directions=("V","V"),
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implant_type=self.implant_type,
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well_type=self.well_type)
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self.add_layout_pin_rect_center(text="S",
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layer="m1",
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offset=pos,
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width=contact.mod.second_layer_width,
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height=contact.mod.second_layer_height)
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width=contact.mod.second_layer_width,
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height=contact.mod.second_layer_height)
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source_positions.append(pos)
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for pos in drain_positions:
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contact=self.add_via_center(layers=self.active_stack,
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offset=pos,
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size=(1, self.num_contacts),
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directions=("V","V"),
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implant_type=self.implant_type,
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well_type=self.well_type)
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self.add_layout_pin_rect_center(text="D",
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layer="m1",
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# Skip these if they are going to be in series
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if not self.series_devices:
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for (poly1, poly2) in zip(self.poly_positions, self.poly_positions[1:]):
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pos = vector(0.5 * (poly1.x + poly2.x),
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self.contact_offset.y)
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# Alternate source and drains
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if label == "S":
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label = "D"
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drain_positions.append(pos)
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else:
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label = "S"
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source_positions.append(pos)
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contact=self.add_via_center(layers=self.active_stack,
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offset=pos,
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width=contact.mod.second_layer_width,
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height=contact.mod.second_layer_height)
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size=(1, self.num_contacts),
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directions=("V","V"),
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implant_type=self.implant_type,
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well_type=self.well_type)
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self.add_layout_pin_rect_center(text=label,
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layer="m1",
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offset=pos,
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width=contact.mod.second_layer_width,
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height=contact.mod.second_layer_height)
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pos = vector(self.active_offset.x + self.active_width - 0.5 * self.active_contact.width,
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self.contact_offset.y)
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# Last one is the opposite of previous
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if label == "S":
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label = "D"
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drain_positions.append(pos)
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else:
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label = "S"
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source_positions.append(pos)
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contact=self.add_via_center(layers=self.active_stack,
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offset=pos,
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size=(1, self.num_contacts),
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directions=("V","V"),
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implant_type=self.implant_type,
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well_type=self.well_type)
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self.add_layout_pin_rect_center(text=label,
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layer="m1",
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offset=pos,
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width=contact.mod.second_layer_width,
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height=contact.mod.second_layer_height)
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if self.connect_active:
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self.connect_fingered_active(drain_positions, source_positions)
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