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`timescale 1ns / 1ps

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

//      (C) 2007,2012  Robert Finch

//      All rights reserved.

//      robfinch<remove>@opencores.org

//

//      PSGShaper.v 

//              Shape the channels by applying the envelope to the tone generator

//      output.

//

//

// 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/>.    

//

//      

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

module PSGShaper(clk_i, ce, tgi, env, o);

input clk_i;            // clock

input ce;                       // clock enable

input [11:0] tgi;        // tone generator input

input [7:0] env; // envelop generator input

output [19:0] o; // shaped output

reg [19:0] o;            // shaped output

// shape output according to envelope

always @(posedge clk_i)

        if (ce)

                o <= tgi * env;

endmodule