addrmap top {
    default regwidth = 8;

    reg {
        field {
            sw=r; hw=w;
            rd_swacc;
        } f[8];
    } r1;

    reg {
        field {
            sw=rw; hw=r;
            wr_swacc;
        } f[8] = 20;
    } r2;
};