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DP83867IR: Rx_ctrl is not strapped

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Part Number:DP83867IR

Hi Ti,

Rx_CTRL(Autoneg Disable) is measured 749 mv. It's mode is 3. So Autneg disable is 0. However, when i read 0x0031 register, I read 0001,0000,1011,0000. I would like to use sgmii interface so I change bit[7] of register 0x31 to 0 and i restart auto-negotiation by writing value 0x1200 to register 0x0. 

First question is that Rx_CTRL is strapped in mode3, why is register 0x0031 read "0001,0000,1011,0000"?

Second question is that Do you any extra steps to activate sgmii interface ? ( sgmii autonegotiation is set to '1' using strap pin)

Thank you for your time.

Seda


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