IEVME_PARACK
iev->pectrl = iev->pectrl | IEVME_PARACK;
iev->pectrl |= IEVME_PARACK; /* clear to start */
write_iev(vsc, pectrl, read_iev(vsc, pectrl) | IEVME_PARACK);
write_iev(vsc, pectrl, read_iev(vsc, pectrl) | IEVME_PARACK);