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Altera_Forum
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16 years ago

Fibonacci Code

This is a Fibonacci code that i made. but it doesn't compile in Quartus II 9.0. but it compile on ModelSim.i need to run on Ciclone II. Could you help me? module fib( LED1, LED2, LED3, LED4, LE...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

The module is completely asynchronous. You really need a clock and hopefully a reset.

try this: 

module fib( 
    input               clk,
    input               reset_n,
    output         LED1,
    output         LED2,
    output         LED3,
    output         LED4,
    output         LED5,
    output         LED6,
    output         LED7,
    output         LED8
);
reg  prev;
reg  actual;
assign  LED1 = {7'd0,actual};
assign  LED2 = {7'd0,actual};
assign  LED3 = {7'd0,actual};
assign  LED4 = {7'd0,actual};
assign  LED5 = {7'd0,actual};
assign  LED6 = {7'd0,actual};
assign  LED7 = {7'd0,actual};
assign  LED8 = {7'd0,actual};
always @(posedge clk or negedge reset_n) begin
    if(!reset_n)    begin
                                prev    <= 8'd0;
                                actual  <= 8'd1;
    end else begin
                                prev    <= actual;
                                actual  <= actual + prev;
    end
endmodule