Verilog

Geoffrey Hunter

mbedded.ninja Author

Counters

A 4-bit Counter In Verilog

module Count4Bit_v1_00 (
    output reg [3:0] count,
    output reg tc,
    input clock,
    input en,
    input reset
);
    parameter period = 0;

    always @ (posedge clock)
begin
    if(reset)
    begin
        count <= 4'b0000;
        tc <= 1'b0;
    end
    else
    begin
        if(en)
        begin
            if(count == period)
            begin
            tc <= 1'b1;
            count <= 4'b0000;
            end
            else
            begin
            count <= count + 1;
            tc <= 1'b0;
            end
        end
        else
        begin
            count <= count;
            tc <= tc;
        end
    end
end

endmodule

External Resources

Embedded Micro has a great example showing how to create a UART transceiver using verilog.