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

//        __

//   \\__/ o\    (C) 2020  Robert Finch, Waterloo

//    \  __ /    All rights reserved.

//     \/_//     robfinch@finitron.ca

//       ||

//

//      DPDDecode.sv

//

// An encoding described in:

//      Densely Packed Decimal Encoding, by Mike Cowlishaw, in

//      IEE Proceedings – Computers and Digital Techniques, ISSN 1350-2387,

//      Vol. 149, No. 3, pp102–104, IEE, May 2002

//

// See: http://speleotrove.com/decimal/DPDecimal.html

//

// BSD 3-Clause License

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// modification, are permitted provided that the following conditions are met:

//

// 1. Redistributions of source code must retain the above copyright notice, this

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// 2. Redistributions in binary form must reproduce the above copyright notice,

//    this list of conditions and the following disclaimer in the documentation

//    and/or other materials provided with the distribution.

//

// 3. Neither the name of the copyright holder nor the names of its

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//    this software without specific prior written permission.

//

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

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//

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

module DPDDecode(i, o);

input [9:0] i;

output [11:0] o;

wire a,b,c,d,e,f,g,h,ii,j,k,m;

wire y,x,w,v,u,t,s,r,q,p;

assign {p,q,r,s,t,u,v,w,x,y} = i;

assign a = (v & w) & (~s | t | ~x);

assign b = p & (~v | ~w | (s & ~t & x));

assign c = q & (~v | ~w | (s & ~t & x));

assign d = r;

assign e = v & ((~w & x) | (~t & x) | (s & x));

assign f = (s & (~v | ~x)) | (p & ~s & t & v & w & x);

assign g = (t & (~v | ~x)) | (q & ~s & t & w);

assign h = u;

assign ii = v & ((~w & ~x) | (w & x & (s | t)));

assign j = (~v & w) | (s & v & ~w & x) | (p & w & (~x | (~s & ~t)));

assign k = (~v & x) | (t & ~w & x) | (q & v & w & (~x | (~s & ~t)));

assign m = y;

assign o = {a,b,c,d,e,f,g,h,ii,j,k,m};

endmodule

module DPDDecodeN(i, o);

parameter N=11;

input [N*10-1:0] i;

output [N*12-1:0] o;

genvar g;

generate begin : gDPD

        for (g = 0; g < N; g = g + 1)

                DPDDecode u1 (i[g*10+9:g*10], o[g*12+11:g*12]);

end

endgenerate

endmodule