HME_MASK_5BIT
hmep->hme_ipg0 = hme_ipg0 & HME_MASK_5BIT;
hmep->hme_ipg0 = hme_ipg0_conf & HME_MASK_5BIT;
i = ((hmep->hme_ipg0 & HME_MASK_5BIT) << BMAC_XIFC_IPG0_SHIFT)