https://community.intel.com/t5/Embedded-Intel-Core-Processors/Why-dose-82574-failed-to-read-its-PHY-register/m-p/248381#M2317 <P>Hi all,</P><P> The 82574 under linux, failed to read its PHY registers through MDIC(0x00020 RW). The return value indicated that the bit30 of MDIC was set to 1. The datasheet describes : If the PHY does not generate a ZERO as the second bit of the turn-around cycle for reads, the MAC aborts the access, sets the E(error)bit, writes 0xFFFF to the data field to indicate an error condition, and sets the Ready bit.</P><P> What does "generate a ZERO as...." mean? And how does it happen? Please help me if anyone knows that.</P><P></P><P>Best regards,</P><P></P><P> linwang</P> Fri, 02 Sep 2011 09:25:13 GMT idata 2011-09-02T09:25:13Z https://community.intel.com/t5/Embedded-Intel-Core-Processors/Why-dose-82574-failed-to-read-its-PHY-register/m-p/248381#M2317 <P>Hi all,</P><P> The 82574 under linux, failed to read its PHY registers through MDIC(0x00020 RW). The return value indicated that the bit30 of MDIC was set to 1. The datasheet describes : If the PHY does not generate a ZERO as the second bit of the turn-around cycle for reads, the MAC aborts the access, sets the E(error)bit, writes 0xFFFF to the data field to indicate an error condition, and sets the Ready bit.</P><P> What does "generate a ZERO as...." mean? And how does it happen? Please help me if anyone knows that.</P><P></P><P>Best regards,</P><P></P><P> linwang</P> Fri, 02 Sep 2011 09:25:13 GMT https://community.intel.com/t5/Embedded-Intel-Core-Processors/Why-dose-82574-failed-to-read-its-PHY-register/m-p/248381#M2317 idata 2011-09-02T09:25:13Z