addrmap top {
    mem ext_mem #(
        longint SIZE = 0x100
    ) {
        memwidth = 32;
        mementries = SIZE / 4;
    };

    external ext_mem #(.SIZE(0x10))  mem1 @ 0x0000;
    external ext_mem #(.SIZE(0x90))  mem2 @ 0x0200;
};