addrmap top {
    default regwidth = 16;
    default accesswidth = 8;

    reg {
        buffer_reads;
        field {
            sw=r; hw=w;
            swacc;
        } f[16];
    } r1;

    reg {
        buffer_reads;
        buffer_writes;
        field {
            sw=rw; hw=r;
            swmod;
        } f[16] = 0x4020;
    } r2;

    reg {
        buffer_reads;
        buffer_writes;
        field {
            sw=rw; hw=r;
            swmod;
            rclr;
        } f[16] = 0x1030;
    } r3;
};