VERILOG083: Default “input” direction should not be used in function arguments

Summary

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Reliability	Security	Maintainability	Code attribute	Effort to fix	Tags
-	-	LOW	Consistency | Conventional	5min	synthesis, readability, vscode, linter, simulation, lowrisc

Description

Noncompliant code example

function automatic logic [2:0] fly(
  input logic [2:0] a, // Noncompliant: 'a' argument has 'input' direction that can be safely removed
  logic [2:0] b
);
  b = b + 1;
  return a + b;
endfunction

Compliant solution

function automatic logic [2:0] fly(
  logic [2:0] a,
  logic [2:0] b
);
  b = b + 1;
  return a + b;
endfunction

Articles & blog posts

• lowRISC Verilog Coding Style Guide - Language Features - Functions and Tasks

Default input direction should not be used in function arguments.

Parameters

No parameters.