verilator/test_regress/t/t_interface_virtual_sched_nba.v

// DESCRIPTION: Verilator: Verilog Test module
//
// This file ONLY is placed under the Creative Commons Public Domain, for
// any use, without warranty, 2023 by Antmicro Ltd.
// SPDX-License-Identifier: CC0-1.0

interface Bus1;
  logic [15:0] data;
endinterface

interface Bus2;
  logic [15:0] data;
endinterface

interface Bus3;
  logic [15:0] data;
endinterface

module t (
    clk
);
  input clk;
  integer cyc = 0;
  Bus1 intf1();
  Bus2 intf2();
  Bus3 intf3();
  virtual Bus1 vif1 = intf1;
  virtual Bus2 vif2 = intf2;
  virtual Bus3 vif3 = intf3;

  logic [15:0] data;
  assign vif2.data = data;

  always @(posedge clk) begin
    cyc <= cyc + 1;
    if (cyc == 1)
      vif1.data = 'hdead;
    else if (cyc == 2)
      data = vif1.data;
    else if (cyc == 3)
      vif1.data = 'hbeef;
    else if (cyc == 4)
      data = vif1.data;
    else if (cyc == 5)
      intf3.data <= 'hface;
    else if (cyc == 6)
      intf3.data <= 'hcafe;
  end

  // Finish on negedge so that $finish is last
  always @(negedge clk)
    if (cyc >= 7) begin
      $write("*-* All Finished *-*\n");
      $finish;
    end

  always_comb $write("[%0t] intf1.data==%h\n", $time, intf1.data);
  always_comb $write("[%0t] intf2.data==%h\n", $time, intf2.data);
  always_comb $write("[%0t] vif3.data==%h\n", $time, vif3.data);
endmodule