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Altera_Forum's avatar
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, LED5, LED6, LED7, LED8);

reg [7:0] i;

reg [7:0] prev;

reg [7:0] actual;

reg [7:0] sum;

output reg[7:0] LED1;

output reg[7:0] LED2;

output reg[7:0] LED3;

output reg[7:0] LED4;

output reg[7:0] LED5;

output reg[7:0] LED6;

output reg[7:0] LED7;

output reg[7:0] LED8;

//parameter ON = 1'b1;

//parameter OFF = 1'b0;

always # 5 begin

sum = actual + prev;

prev = actual;

actual = sum;

end

always# 6 begin

if (sum == 8'd0)

begin

assign LED1 = 1'b0;

assign LED2 = 1'b0;

assign LED3 = 1'b0;

assign LED4 = 1'b0;

assign LED5 = 1'b0;

assign LED6 = 1'b0;

assign LED7 = 1'b0;

assign LED8 = 1'b0;

end

else if(sum == 8'd1)

begin

assign LED1 = 1'b1;

assign LED2 = 1'b0;

assign LED3 = 1'b0;

assign LED4 = 1'b0;

assign LED5 = 1'b0;

assign LED6 = 1'b0;

assign LED7 = 1'b0;

assign LED8 = 1'b0;

end

else if(sum == 8'd2)

begin

assign LED1 = 1'b0;

assign LED2 = 1'b1;

assign LED3 = 1'b0;

assign LED4 = 1'b0;

assign LED5 = 1'b0;

assign LED6 = 1'b0;

assign LED7 = 1'b0;

assign LED8 = 1'b0;

end

else if(sum == 8'd3)

begin

assign LED1 = 1'b1;

assign LED2 = 1'b1;

assign LED3 = 1'b0;

assign LED4 = 1'b0;

assign LED5 = 1'b0;

assign LED6 = 1'b0;

assign LED7 = 1'b0;

assign LED8 = 1'b0;

end

else if(sum == 8'd5)

begin

assign LED1 = 1'b1;

assign LED2 = 1'b0;

assign LED3 = 1'b1;

assign LED4 = 1'b0;

assign LED5 = 1'b0;

assign LED6 = 1'b0;

assign LED7 = 1'b0;

assign LED8 = 1'b0;

end

else if(sum == 8'd8)

begin

assign LED1 = 1'b0;

assign LED2 = 1'b0;

assign LED3 = 1'b0;

assign LED4 = 1'b1;

assign LED5 = 1'b0;

assign LED6 = 1'b0;

assign LED7 = 1'b0;

assign LED8 = 1'b0;

end

else if(sum == 8'd13)

begin

assign LED1 = 1'b1;

assign LED2 = 1'b0;

assign LED3 = 1'b1;

assign LED4 = 1'b1;

assign LED5 = 1'b0;

assign LED6 = 1'b0;

assign LED7 = 1'b0;

assign LED8 = 1'b0;

end

else if(sum == 8'd21)

begin

assign LED1 = 1'b1;

assign LED2 = 1'b0;

assign LED3 = 1'b1;

assign LED4 = 1'b0;

assign LED5 = 1'b1;

assign LED6 = 1'b0;

assign LED7 = 1'b0;

assign LED8 = 1'b0;

end

else if(sum == 8'd34)begin

assign LED1 = 1'b0;

assign LED2 = 1'b0;

assign LED3 = 1'b1;

assign LED4 = 1'b0;

assign LED5 = 1'b0;

assign LED6 = 1'b1;

assign LED7 = 1'b0;

assign LED8 = 1'b0;

end

else if(sum == 8'd55)

begin

assign LED1 = 1'b1;

assign LED2 = 1'b1;

assign LED3 = 1'b1;

assign LED4 = 1'b0;

assign LED5 = 1'b1;

assign LED6 = 1'b1;

assign LED7 = 1'b0;

assign LED8 = 1'b0;

end

else if(sum == 8'd89)begin

assign LED1 = 1'b1;

assign LED2 = 1'b0;

assign LED3 = 1'b0;

assign LED4 = 1'b1;

assign LED5 = 1'b1;

assign LED6 = 1'b0;

assign LED7 = 1'b1;

assign LED8 = 1'b0;

end

else if(sum == 8'd144)

begin

assign LED1 = 1'b0;

assign LED2 = 1'b0;

assign LED3 = 1'b0;

assign LED4 = 1'b0;

assign LED5 = 1'b1;

assign LED6 = 1'b0;

assign LED7 = 1'b0;

assign LED8 = 1'b1;

end

else if (sum == 8'd233)

begin

assign LED1 = 1'b1;

assign LED2 = 1'b0;

assign LED3 = 1'b0;

assign LED4 = 1'b1;

assign LED5 = 1'b0;

assign LED6 = 1'b1;

assign LED7 = 1'b1;

assign LED8 = 1'b1;

end

end

initial begin

$monitor("Time = %g Sum = %d", $time, sum);

prev = 8'd0;

actual = 8'd1;

sum = 8'd0;

i = 8'd60;

# 5$display("Time= %g Sum = %d", $time, 1);

# i $finish;

end

endmodule

thanks for all!

3 Replies

  • 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
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    Modfied for only 8 outputs. You need to make your pin assignments in Quartus as LED[0],LED[1],LED[2],LED[3]... etc. 

    module fib( 
    input               clk,
    input               reset_n,
    output         LED,
);
reg  prev;
reg  actual;
assign  LED = 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

    --- Quote End ---

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    module fibclk(

    input clk,

    input reset_n,

    output [7:0] LED

    );

    reg [7:0] prev;

    reg [7:0] actual;

    assign LED = actual;

    always @(posedge clk or reset_n)

    begin

    if(!reset_n)

    begin

    prev = 8'd0;

    actual = 8'd1;

    end else

    begin

    prev = actual;

    actual = actual + prev;

    end

    end

    endmodule

    MAKE ATTENTION :

    1) no edge on more than one signal in alway key (only the clock signal) !!!!!

    2) <= is comparator in VERILOG but assignment in VHDL, you are in VERILOG so it is = affectation.

    I don't understande your problem on the LED !!!

    To see some think, you must use very low frequency clock, if not, you will see all LEDs ON !!!!

    You need to reduice the Frequency of the primary clock ( 0.5Hz is very good to see binary number of fabonacci). I prefer using 7seg dusplay.

    Good luck

    Impossible to contact you because my reply counter is too low (must be 10 to be able to send PM)