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module fibonacci_calculator ( clk, reset_n , input_s, begin_fibo , fibo_out, done );

module fibonacci_calculator ( clk, reset_n , input_s, begin_fibo , fibo_out, done ); input clk; input reset_n; input [4:0] input_s; input begin_fibo; output [15:0] fibo_out; output done ; reg state;

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module fibonacci_calculator ( clk, reset_n , input_s, begin_fibo , fibo_out, done );

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  1. module fibonacci_calculator (clk, reset_n, input_s, begin_fibo, fibo_out, done); input clk; input reset_n; input [4:0] input_s; input begin_fibo; output [15:0] fibo_out; output done; reg state; reg [4:0] count; reg [15:0] R0; reg [15:0] R1; parameter IDLE = 1'b0; parameter COMPUTE = 1'b1; assign done = state & (count == 1); assign fibo_out = R0; always @(posedge clk or negedge reset_n) begin if (!reset_n) state <= IDLE; else case (state) IDLE: if (begin_fibo) begin count <= input_s; R0 <= 1; R1 <= 0; state <= COMPUTE; end COMPUTE: if (count > 1) begin count <= count - 1; R0 <= R0 + R1; R1 <= R0; end else state <= IDLE; endcase end endmodule

  2. reset_n clk module fibonacci_calculator clocked always statement assign statement 5 ==1 & Input_s count 0 1 done +1 5 1 0 1 R0 fibo_out + 16 0 0 1 R1 16 1 >1 0 1 state 0 0 1

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