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// DESCRIPTION: Verilator: --protect-lib example secret module
//
// This file ONLY is placed under the Creative Commons Public Domain, for
// any use, without warranty, 2019 by Todd Strader.
// SPDX-License-Identifier: CC0-1.0
// This module will be used as libsecret.a or libsecret.so without
// exposing the source.
module secret_impl (
input [31:0] a,
input [31:0] b,
output logic [31:0] x,
input clk,
input reset_l
);
logic [31:0] accum_q;
logic [31:0] secret_value;
initial $display("[%0t] %m: initialized", $time);
always @(posedge clk) begin
if (!reset_l) begin
accum_q <= 0;
secret_value <= 9;
end
else begin
accum_q <= accum_q + a;
if (accum_q > 10) x <= b;
else x <= a + b + secret_value;
end
end
endmodule
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