@Matt Venn in the git repo that i cloned just now the power cells are written as "vdd" and "vss" in the user_proj_example.v and user_project_wrapper.v but the videos I am following from the "how-to" playlist from efabless; in that power cells are called "vssd1".

What the power supply names are called in the

user_proj_example

module is irrelevant; the power supply names in

user_project_wrapper

must be "vccd1", "vssd1", etc., because there are automated scripts that analyze the project wrapper and expect the pin names to match what's expected. Within

user_project_wrapper

, the pin (net) names can get connected to different names in the instanced modules; e.g., in the call to instantiate

user_proj_example

, the pin assignment

.vdd(vccd1)

would connect the power supply named

vccd1

in

user_project_wrapper

to the power supply named

vdd

in

user_proj_example

.

@Tim Edwards Thank you i will change pin name in user_project_wrapper and run the floe again

@Ananya Mishra the power for

sky130

is

vccd1

and

vssd1

. The power for

gf180mcu

is

vdd

and

vss

.

@Mitch Bailey: Good point. Nothing in the discussion up to here specifies whether this project is on sky130 or gf180mcu, but it definitely makes a difference with respect to the power supply names.

Thank You @Tim Edwards and @Mitch Bailey. we were using sky130 only that issue got resolved, I changed all name in vccd1 format