addrmap top {
    reg {
        field {
            hw=r; sw=rw;
        } y = 0;
    } whee[2][8];

    regfile {
        reg {
            field {
                hw=w; sw=r;
            } abc[16:2] = 20;
            field {
                hw=r; sw=rw;
            } def[4] = 0;
        } aaa[4];
        reg {
            field {
                hw=r; sw=rw;
            } abc = 0;
            field {
                hw=r; sw=rw;
            } def = 0;
        } bbb;
    } asdf[20];
};