addrmap top {
    reg {
        field {
            sw = rw;
            hw = w;
            singlepulse = true;
        } a = 0;
        field {
            sw = rw;
            hw = w;
            singlepulse = true;
            posedge intr;
            stickybit = false;
        } b = 0;
        field {
            sw = rw;
            hw = w;
            singlepulse = true;
            negedge intr;
            stickybit = false;
        } c = 0;
        field {
            sw = rw;
            hw = w;
            singlepulse = true;
            bothedge intr;
            stickybit = false;
        } d = 0;
    } x;
};

/*
stickybit=false + intr posedge
stickybit=false + intr negedge
stickybit=false + intr bothedge
hw=w wel = false
singlepulse


*/