addrmap top {
    default regwidth = 8;

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

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

    reg {
        field {
            sw=rw; hw=r;
            swmod;
            rclr;
        } f[8] = 30;
    } r3;

    reg {
        field {
            sw=rw; hw=r;
            swacc;
            swmod;
        } f[8] = 0x12;
    } r4;

    reg {
        field {
            sw=r; hw=rw;
            we;
            swmod;
            rclr;
        } f[8] = 30;
    } r5;
};