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

//        __

//   \\__/ o\    (C) 2017-2019  Robert Finch, Waterloo

//    \  __ /    All rights reserved.

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

//       ||

//

//      sigmoid_tb.v

//              - test sigmoid

//

//

// 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 .

//

//

// This module returns the sigmoid of a number using a lookup table.

// -1.0 or +1.0 is returned for entries outside of the range -8.0 to +8.0

//

//

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

module sigmoid_tb();

reg clk, rst;

reg [12:0] ndx;

wire [31:0] o;

initial begin

  #0 rst = 1'b0;

  #0 clk = 1'b0;

  #10 rst = 1'b1;

  #40 rst = 1'b0;

end

always #5 clk = ~clk;

reg [31:0] RngLUT [0:8191];

initial begin

`include "D:\Cores6\rtfItanium\v1\rtl\fpUnit\RangeTbl.ver"

end

fpSigmoid #(32) u1 (clk, 1'b1, RngLUT[ndx], o);

always @(posedge clk)

if (rst)

  ndx = 0;

else begin

  ndx = ndx + 13'd1;

end

wire [31:0] o1, o2;

// Multiply number by 4096 (it is in range -1 to 1) then convert to integer

assign o1[22:0] = o[22:0];

assign o1[30:23] = o[30:23] + 8'd12; // we know this won't overflow

assign o1[31] = o[31];

f2i #(32) u2

(

  .clk(clk),

  .ce(1'b1),

  .i(o1),

  .o(o2)

);

endmodule