IGC_TDH
IGC_WRITE_REG(hw, IGC_TDH(i), 0);
IGC_TDH(txr->me), igc_sysctl_reg_handler, "IU",
IGC_READ_REG(&sc->hw, IGC_TDH(i)),
regs_buff[15] = IGC_READ_REG(hw, IGC_TDH(0));