HCR_REG
HXGE_REG_RD32(handle, HCR_REG + HCR_N_MAC_ADDRS, n_of_addrs);
HXGE_REG_RD32(handle, HCR_REG + HCR_ADDR_LO + slot * step, &addr_lo);
HXGE_REG_RD32(handle, HCR_REG + HCR_ADDR_HI + slot * step, &addr_hi);