How to call tasks from a separate module in Verilog?

问题

I'm new to Verilog and would really appreciate it if someone could help me with this.

I have a task written in a separate file - "task.v" :

module task_create();

task assign_inp;
    reg a,b,c,d;
    //details
endtask

endmodule

I have a module that is calling this task:

module tb();
    `include "task.v"
    assign_inp(a,b,c,d);
endmodule

When I execute this, I get this error:

Module definition task_create cannot nest into module tb

When I remove the module and endmodule in task.v, I get this error:

Task must be contained inside a module

Where am I going wrong? Thank you so much!

回答1:

Your task in in a module and so can only be seen in the module. What you can do is remove the module wrapper and just declare the task in a separate file.

task assign_inp;
    reg a,b,c,d;
    //details
endtask

You can include the task and you should be able to see the task.

Removing the modules works for me.

EDIT: You may need to declare the verilog file as a header file for the task

来源：https://stackoverflow.com/questions/37624934/how-to-call-tasks-from-a-separate-module-in-verilog