Subversion Repositories ft816float

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

//        __

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

//    \  __ /    All rights reserved.

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

//       ||

//

//      DFPDecompose.sv

//

// BSD 3-Clause License

// Redistribution and use in source and binary forms, with or without

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

//

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

//    list of conditions and the following disclaimer.

//

// 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

//    contributors may be used to endorse or promote products derived from

//    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

// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE

// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER

// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,

// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

//

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

module DFPDecompose(i, sgn, sx, exp, sig, xz, vz, inf, nan);

parameter N=33;

input [(N*4)+16+4-1:0] i;

output sgn;

output sx;

output [15:0] exp;

output [N*4-1:0] sig;

output xz;

output vz;

output inf;

output nan;

assign nan = i[N*4+19];

assign sgn = i[N*4+18];

assign inf = i[N*4+17];

assign sx = i[N*4+16];

assign exp = i[N*4+15:N*4];

assign sig = i[N*4-1:0];

assign xz = ~|exp;

assign vz = ~|{exp,sig};

endmodule

module DFPDecomposeReg(clk, ce, i, sgn, sx, exp, sig, xz, vz, inf, nan);

parameter N=33;

input clk;

input ce;

input [N*4+16+4-1:0] i;

output reg sgn;

output reg sx;

output reg [15:0] exp;

output reg [N*4-1:0] sig;

output reg xz;

output reg vz;

output reg inf;

output reg nan;

always @(posedge clk)

        if (ce) begin

                nan <= i[N*4+19];

                sgn <= i[N*4+18];

                inf <= i[N*4+17];

                sx <= i[N*4+16];

                exp <= i[N*4+15:N*4];

                sig <= i[N*4-1:0];

                xz <= ~|exp;

                vz <= ~|{exp,sig};

        end

endmodule