def _move_probe_ref(self,cell):
device_ref=cell["Device"]
probe_ref=cell["Probe"]
bottom_ports=ppt.find_ports(cell,'bottom',depth=0,exact=True)
try:
probe_port=probe_ref.ports['SigN']
except:
probe_port=probe_ref.ports['SigN_1']
top_ports=ppt.find_ports(device_ref,'top')
if len(top_ports)>1:
probe_ref.connect(
port=probe_port,
destination=bottom_ports[0],
overlap=-self.probe_conn_distance.y)
else:
probe_ref.connect(
port=probe_port,
destination=bottom_ports[0],
overlap=-self.probe_dut_distance.y)
def _make_internal_ground_connections(self,cell):
lx_ports=ppt.find_ports(cell,'GroundLX',depth=0)
rx_ports=ppt.find_ports(cell,'GroundRX',depth=0)
if len(lx_ports)<=1 or len(rx_ports)<=1:
return
else:
lx_ports.remove(lx_ports[0])
rx_ports.remove(rx_ports[-1])
polyconn=pc.PolyRouting()
polyconn.layer=self.plate_layer
for l,r in zip(lx_ports,rx_ports):
polyconn.source=l
polyconn.destination=r
cell.add(polyconn.draw())
cell.remove(cell.ports[l.name])
cell.remove(cell.ports[r.name])
def add_pads(cell,pad,tag='top',exact=False):
''' add pad designs to a cell, connecting it to selected ports.
Parameters:
-----------
cell : Device
pad : pt.LayoutPart
tags : str (or iterable of str)
used to find ports
'''
if not isinstance(tag,str):
ports=[]
for t in tag:
ports.extend(ppt.find_ports(cell,t,depth=0,exact=exact))
else:
ports=ppt.find_ports(cell,tag,depth=0,exact=exact)
pad_cell=Device()
for port in ports:
pad.port=port
pad_ref=pad_cell.add_ref(pad.draw())
pad_ref.connect('conn',destination=port)
cell.add_ref(pad_cell,alias="Pad")
def _setup_probe(self,device_cell):
top_ports=[pt.Point(p.midpoint) for p in ppt.find_ports(device_cell,'top',depth=0)]
bottom_ports=[pt.Point(p.midpoint) for p in ppt.find_ports(device_cell,'bottom',depth=0)]
top_port_midpoint=st.get_centroid(*top_ports)
bottom_port_midpoint=st.get_centroid(*bottom_ports)
self.probe.offset=pt.Point(
(top_port_midpoint.x-bottom_port_midpoint.x),
(top_port_midpoint.y-bottom_port_midpoint.y)+2*self.probe_dut_distance.y)
def _setup_ground_routing(self,cell,label):
device_ref=cell["Device"]
probe_ref=cell["Probe"]
bbox=super()._bbox_mod(device_ref.bbox)
if isinstance(self.probe,pc.GSGProbe):
for index,groundroute in enumerate([self.gndlefttrace,self.gndrighttrace]):
groundroute.layer=self.probe.ground_layer
groundroute.clearance=bbox
groundroute.overhang=None
groundroute.trace_width=self.gnd_routing_width
if index==0:
groundroute.side='left'
if label=='straight':
groundroute.source=probe_ref.ports['GroundLXN']
elif label=='side':
groundroute.source=(probe_ref.ports['GroundLXW'],)
elif index==1:
groundroute.side='right'
if label=='straight':
groundroute.source=(probe_ref.ports['GroundRXN'],)
elif label=='side':
groundroute.source=(probe_ref.ports['GroundRXE'],)
dest_ports=ppt.find_ports(device_ref,'top')
groundroute.destination=tuple(dest_ports)
elif isinstance(self.probe,pc.GSProbe):
raise ValueError("OnePortProbed with GSprobe to be implemented ")
else:
raise ValueError("OnePortProbed without GSG/GSprobe to be implemented ")
def _add_signal_connection(self,cell,tag):
device_cell=cell["Device"]
ports=ppt.find_ports(device_cell,tag,depth=0)
if len(ports)>1:
distance=self.probe_dut_distance.y-self.probe_conn_distance.y
port_mid=st.get_centroid_ports(*ports)
if distance-port_mid.width>0:
sigtrace=connect_ports(
device_cell,
tag=tag,
layer=self.probe.sig_layer,
distance=distance-port_mid.width,
metal_width=port_mid.width)
else:
sigtrace=connect_ports(
device_cell,
tag=tag,
layer=self.probe.sig_layer,
distance=0,
metal_width=distance)
if not self.parasitic_control:
sigtrace.ports[tag].width=sigtrace.xsize
paux=ppt.shift_port(sigtrace.ports[tag],self.probe_conn_distance.y/3)
paux.width=self.probe.size.x
sigtrace.add(pr.route_quad(
sigtrace.ports[tag],paux,layer=self.probe.sig_layer))
cell.absorb(cell<<sigtrace)
sigtrace.ports[tag].width=self.probe.size.x
ppt.copy_ports(sigtrace,cell)
else:
cell.add_port(port=device_cell.ports[tag])
def _draw_ground_extensions(self,cell):
device_cell=cell["Device"]
output_cell=Device()
lx_device_ports=[]
rx_device_ports=[]
gnd_ports=ppt.find_ports(device_cell,'Ground',depth=0)
if not gnd_ports:
return output_cell
for p in gnd_ports:
if "LX" in p.name:
lx_device_ports.append(p)
elif "RX" in p.name:
rx_device_ports.append(p)
for p in lx_device_ports:
ext_length=abs(cell.xmin-p.midpoint[0]+self.gnd_routing_width)
output_cell.add(ppt.extend_port(p,
width=p.width,
length=ext_length,
layer=self.gndlefttrace.layer))
for p in rx_device_ports:
ext_length=abs(cell.xmax-p.midpoint[0]-self.gnd_routing_width)
output_cell.add(ppt.extend_port(p,
width=p.width,
length=ext_length,
layer=self.gndlefttrace.layer))
return output_cell
def connect_ports(
cell : Device,
tag : str ='top',
layer : int= ld.layerTop,
distance : float = 10.0,
metal_width: float = None):
''' connects all the ports in the cell with name matching a tag.
Parameters:
-----------
cell : Device
tag: str
conn_dist: pt.Point
offset from port location
layer : tuple.
Returns:
----------
cell : Device
contains routings and connection port
'''
import pirel.pcells as pc
ports=ppt.find_ports(cell,tag,depth=0)
ports.sort(key=lambda x: x.midpoint[0])
ports_centroid=st.get_centroid_ports(*ports)
if len(ports)==1:
raise ValueError("pm.connect_ports() : len(ports) must be >1 ")
if metal_width is None:
metal_width=ports_centroid.width
port_mid_norm=pt.Point(ports_centroid.normal[1])-pt.Point(ports_centroid.normal[0])
midpoint_projected=Point(ports_centroid.midpoint)+port_mid_norm*(distance+metal_width)
pad_side=ports_centroid.width
new_port=Port(
name=tag,
orientation=ports_centroid.orientation,
width=ports_centroid.width,
midpoint=midpoint_projected.coord)
output_cell=Device()
for p in ports:
straight_conn=output_cell<<pg.compass(
layer=layer,size=(p.width,abs(midpoint_projected.y-p.midpoint[1])))
straight_conn.connect("S",p)
cross_conn=output_cell<<pg.compass(
layer=layer,size=(output_cell.xsize,metal_width))
cross_conn.connect('S',new_port,overlap=metal_width)
output=st.join(output_cell)
output.add_port(new_port)
return output
def _draw_device_grounds(self,device_cell,probe_cell,label):
output_cell=Device()
lx_device_ports=[]
rx_device_ports=[]
gnd_ports=ppt.find_ports(device_cell,'Ground',depth=0)
if not gnd_ports:
return output_cell
for p in gnd_ports:
p_adj=Port(
name=p.name,
midpoint=p.midpoint,
width=probe_cell['Port1'].size[1],
orientation=p.orientation)
if "LX" in p.name:
lx_device_ports.append(p_adj)
elif "RX" in p.name:
rx_device_ports.append(p_adj)
r=pc.Routing()
r.layer=self.gndlefttrace.layer
r.clearance=pt._bbox_to_tuple(self._bbox_mod(device_cell.bbox))
r.trace_width=self.gnd_routing_width
## left connections
if label=='side':
r.source=tuple(ppt.find_ports(probe_cell,'GroundLXW',depth=0))
elif label=='straight':
r.source=(probe_cell.ports['GroundLXN_1'],)
r.destination=tuple(lx_device_ports)
r.side='left'
output_cell.absorb(output_cell<<r.draw())
## right connections
if label=='side':
r.source=tuple(ppt.find_ports(probe_cell,'GroundRXE',depth=0))
elif label=='straight':
r.source=(probe_cell.ports['GroundRXN_1'],)
r.destination=tuple(rx_device_ports)
r.side='right'
output_cell.absorb(output_cell<<r.draw())
return output_cell