16-bits upcounter

/*===================================================
16-bits upcounter
This counter is positive edge triggered
and will count up to 2^16
its count reset at on negative edge active low clear
====================================================*/
module counter16bitup (
        input clock, clear,
        output reg [15:0] count);

initial
    count=4;    // start count from 4

always @ (posedge clock or negedge clear)   // trigger at positive-edge clock or negative-edge clear
    if (!clear)
        count=1;            // count reset when clear is LOW
    else count=count + 1;

endmodule