TSEC_REG_MIIMCFG
TSEC_PHY_WRITE(sc, TSEC_REG_MIIMCFG, TSEC_MIIMCFG_RESETMGMT);
TSEC_PHY_WRITE(sc, TSEC_REG_MIIMCFG, TSEC_MIIMCFG_CLKDIV28);