///////////////////////////////////////////
// mux.sv
//
// Written: David_Harris@hmc.edu 9 January 2021
// Modified: 
//
// Purpose: Various flavors of multiplexers
// 
// A component of the Wally configurable RISC-V project.
// 
// Copyright (C) 2021 Harvey Mudd College & Oklahoma State University
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, 
// modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software 
// is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES 
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 
// BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT 
// OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
///////////////////////////////////////////

`include "wally-config.vh"
/* verilator lint_off DECLFILENAME */


module mux2 #(parameter WIDTH = 8) (
  input  logic [WIDTH-1:0] d0, d1, 
  input  logic             s, 
  output logic [WIDTH-1:0] y);

  assign y = s ? d1 : d0; 
endmodule

module mux3 #(parameter WIDTH = 8) (
  input  logic [WIDTH-1:0] d0, d1, d2,
  input  logic [1:0]       s, 
  output logic [WIDTH-1:0] y);

  assign y = s[1] ? d2 : (s[0] ? d1 : d0); 
endmodule

module mux4 #(parameter WIDTH = 8) (
  input  logic [WIDTH-1:0] d0, d1, d2, d3,
  input  logic [1:0]       s, 
  output logic [WIDTH-1:0] y);

  assign y = s[1] ? (s[0] ? d3 : d2) : (s[0] ? d1 : d0); 
endmodule

/* verilator lint_on DECLFILENAME */