Can I connect multiple ports to only one signal? e.g. in schematic I want to connect io_analog[4] and io_analog[3] to one signal, how would the netlist look like? I am trying to use the user_analog_project_wrapper to wrap up my design, but there are some multi-ports-to-one-signal issues... not sure this is the right way to wrap up my design....

Multiple nets to one signal should be done using a metal resistor such as

sky130_fd_pr__res_generic_m1

, which is just a piece of metal that is treated like a resistor device, and so breaks the net. The device corresponds to layer

rmetal1

in magic, so you can have a 1:1 correspondence between the device in schematic and layout. In xschem, if the generic resistor device doesn't exist, you can use the

res_generic_m1.sym

and change the model name in the parameters as needed. The other way to handle it is to insert a zero-ohm ideal resistor or a zero-volt independent voltage source to break the net. The netgen LVS tool knows how to deal with these components. In magic, using

ext2spice short resistor

will separate different port names that are connected to the same net with a zero-ohm resistor.

... and how do you get component signals plotted?

analog_wrapper_tb

barfs at me at the moment when I try it.