Subversion Repositories sqmusic

/*

        SQmusic

        logarithmic digital amplifier to use with SQMUSIC

  Version 0.1, tested on simulation only with Capcom's 1942

  (c) Jose Tejada Gomez, 9th May 2013

  You can use this file following the GNU GENERAL PUBLIC LICENSE version 3

  Read the details of the license in:

  http://www.gnu.org/licenses/gpl.txt

  Send comments to: jose.tejada@ieee.org

*/

`timescale 1ns / 1ps

module SQM_AMP(

        input [3:0]A, input [3:0]B, input [3:0]C, // input channels

        output [15:0] Y

);

wire[11:0] Alog, Blog, Clog;

SQM_LOG adac( .din(A), .dout(Alog) );

SQM_LOG bdac( .din(B), .dout(Blog) );

SQM_LOG cdac( .din(C), .dout(Clog) );

//always @(*)

assign Y=Alog+Blog+Clog;

endmodule

module SQM_LOG(

        input [3:0]din,

        output reg [11:0]dout );

always @(din)

        case (din)

                0: dout=0;

                1: dout=16;

                2: dout=19;

                3: dout=32;

                4: dout=39;

                5: dout=64;

                6: dout=78;

                7: dout=128;

                8: dout=155;

                9: dout=256;

         10: dout=310;

         11: dout=512;

         12: dout=621;

         13: dout=1024;

         14: dout=1448;

         15: dout=2048;

        endcase

endmodule