_CMD_NBITS
#define _CMD_NMASK ((1 << _CMD_NBITS)-1)
#define _CMD_VTYPESHIFT (_CMD_NSHIFT+_CMD_NBITS)
#define _CMD_NMASK ((1 << _CMD_NBITS)-1)
#define _CMD_VTYPESHIFT (_CMD_NSHIFT+_CMD_NBITS)
#define _CMD_NMASK ((1 << _CMD_NBITS)-1)
#define _CMD_VTYPESHIFT (_CMD_NSHIFT+_CMD_NBITS)