MASK_MIIR_MII_MDC
miir &= ~MASK_MIIR_MII_MDC;
miir |= MASK_MIIR_MII_MDC;
miir &= ~(MASK_MIIR_MII_MDC + MASK_MIIR_MII_MDO);
miir |= MASK_MIIR_MII_MDC;
miir &= ~MASK_MIIR_MII_MDC;
miir |= MASK_MIIR_MII_MDC;
miir &= ~MASK_MIIR_MII_MDC;
miir &= ~(MASK_MIIR_MII_MDC + MASK_MIIR_MII_MDO);
miir |= MASK_MIIR_MII_MDC;
miir &= ~MASK_MIIR_MII_MDC;