typedef struct MEIControlVersion {
    struct {	/* control.c */
        char	*version;	/* MEIControlVersionMPI (YYYYMMDD) */

        struct {	/* xmp.h */
            long	version;	/* MEIXmpVERSION */
            long	option;		/* MEIXmpOPTION */
        } firmware;
    } mpi;

    struct {
        long	version;	/* hardware version */


        struct {	/* MEIXmpData.SystemData{} */
            long	version;	/* MEIXmpVERSION_EXTRACT(SoftwareID) */
            char	revision;	/* ('A' - 1) + MEIXmpREVISION_EXTRACT(SoftwareID) */
            long	subRevision;	/* MEIXmpSUB_REV_EXTRACT(Option) */
            long	developmentId;	/* MEIXmpDEVELOPMENT_ID_EXTRACT(Option) */
            long	option;		/* MEIXmpOPTION_EXTRACT(Option) */
            long	userVersion;
        } firmware;

        struct	{
            long	FPGA[MEIXmpFPGAsPerBlock];
        } motionBlock[MEIXmpMaxMotionBlocks];

        struct {
            struct	{
                long	version;
                long	option;
            } busInterface;
        } board[MEIXmpMaxBoards];
    } xmp;
} MEIControlVersion;

ControlVersion is a structure that specifies the version information for the MPI and the controller's firmware, FPGAs, and the bus interface.