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i think you could read the datasheet of this IC Ks8721 and DP83848 . KS8721 has some same registers as DP83848 , (registers form 00H-07H) but KS8721 doesnt have the phy_status reg similar with DP83848, so You can find the bit of the other register for read status of IC and reconfig Emac (ex: FullDuplex of speed )