ENETC_PSIVHFR0
bitmap = ENETC_PORT_RD4(sc, ENETC_PSIVHFR0(0));
ENETC_PORT_WR4(sc, ENETC_PSIVHFR0(0), bitmap & UINT32_MAX);
bitmap = ENETC_PORT_RD4(sc, ENETC_PSIVHFR0(0));
ENETC_PORT_WR4(sc, ENETC_PSIVHFR0(0), bitmap & UINT32_MAX);