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DP83822IF: About MII line impedance

Part Number: DP83822IF

Hello,

Regarding to MII line impedance on DP83822, my customer is asking a question. 

(Question)

・According to datasheet page 94, MII line impedance should be routed with 50 ohm impedance to ground.

But according to application note(AN-1469) page 8, on the MII signals the IEEE specification states the bus should be 68 ohm impedance.

Which should we believe?

 

Regards,

Tao 2199