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DP83822IF: DP83822 Communication issue with fiber port

Part Number: DP83822IF

I use DP83822IF in 100M-FX mode,and I know signal detection should be enabled, but according to my experiment, it is opposite logic, if I adjust bootstrap in mode 4 (we are using RMII Mode) ,the link cannot established, when I set it to mode 1,the link status is ok.