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`timescale 1ns / 1ps

// ============================================================================

//      (C) 2007,2012  Robert Finch

//  robfinch<remove>@opencores.org

//      All rights reserved.

//

//      PSGNoteOutMux.v

//      Version 1.0

//

// This source file is free software: you can redistribute it and/or modify 

// it under the terms of the GNU Lesser General Public License as published 

// by the Free Software Foundation, either version 3 of the License, or     

// (at your option) any later version.                                      

//                                                                          

// This source file is distributed in the hope that it will be useful,      

// but WITHOUT ANY WARRANTY; without even the implied warranty of           

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the            

// GNU General Public License for more details.                             

//                                                                          

// You should have received a copy of the GNU General Public License        

// along with this program.  If not, see <http://www.gnu.org/licenses/>.    

//

//      

//      Selects from one of five waveforms for output. Selected waveform

//      outputs are anded together. This is approximately how the

//      original SID worked.

//

//      Spartan3

//      Webpack 9.1i xc3s1000-4ft256

//      36 LUTs / 21 slices / 11ns

//============================================================================ */

//

module PSGNoteOutMux(s, a, b, c, d, e, o);

parameter WID = 12;

input [4:0] s;

input [WID-1:0] a,b,c,d,e;

output [WID-1:0] o;

wire [WID-1:0] o1,o2,o3,o4,o5;

assign o1 = s[4] ? e : {WID{1'b1}};

assign o2 = s[3] ? d : {WID{1'b1}};

assign o3 = s[2] ? c : {WID{1'b1}};

assign o4 = s[1] ? b : {WID{1'b1}};

assign o5 = s[0] ? a : {WID{1'b1}};

assign o = o1 & o2 & o3 & o4 & o5;

endmodule