RIO_EM_PN_ERR_DETECT
rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), &em_perrdet);
rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), 0);
rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), &em_perrdet);
rdev->em_efptr + RIO_EM_PN_ERR_DETECT(i), 0);