i got only one error please any one help me to resolve it. How to assign the Input pins to the caravel ? can any one guide me it is little Urgent (Simple and gate )

Is this homework? Openlane is complaining because you are assigning to an input wire in the line

assign io_in={a,b};

. In the module

user_proj_and_gate

, the bus

io_in

is an input from the outside and you are passing

a

and

b

to the submodule

and_gate

. You might want to do the assignment the other way round. You also have a typo in some of your variable names, and the assignments probably don't do what you expect as the bit widths don't match:

io_in

is 3 bits but

{a,b}

is 2 bits, also

io_out

is 3 bits but

y

is 1 bit. Finally you might want to change the value of

io_oeb

to something different.

not resolved yet.

as @htamas said, io_in is an input, you can't assign to an input, you can only read from it

IN caravel device i want to send the a,b input through io pad means how to assign those things ? @Matt Venn. or else what i have to do with that 2 inputs of my and gate logic . please guide me @htamas

I think what you want to do is assign a from one of the inputs. So it will be more like assign a = io_in, not io_in = a. The order matter

Here are a few short videos explaining the important concepts here: Hierarchical Design Continuous Assignment Concatenation General Purpose I/O