Why is this an issue?

The Verilog-2001 combined port and I/O declaration style should be used in module/program/interface declarations. The deprecated Verilog-95 list style should not be used.

How to fix it

Code examples

Noncompliant code example

module fly(a, b);
  input wire [2:0] a;
  output reg b;
  ...
endmodule : fly

Compliant solution

module fly (
  input logic[2:0] a,
  output logic b
);
  ...
endmodule : fly

Resources

Articles & blog posts

• lowRISC Verilog Coding Style Guide - Language Features - Module Declaration