mem mem_empty #(
    longint WIDTH = 32
){
    memwidth = WIDTH;
    mementries = 16;
};


addrmap top {
    reg wide_reg {
        regwidth = 128;
        field {} f1[32];
        field {} f2[32];
        field {} f3[32];
        field {} f4[32];
    };

    wide_reg r1;
    wide_reg r2[4];
    wide_reg r3;

    external mem_empty #(.WIDTH(128)) mem_empty_128;
};