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DP83848I: Network Tap Application PHY as Receiver only

Part Number: DP83848I

Dear Ladys and Gentleman,

we plan a Network Tap Application with the DP83848I.
The PHY is only connected with its RX+- Ports. TX+- is disconnected.
The PHY should only receive Ethernet Frames with its RX+- PINs.
We use 2 wired RJ45 JACK as input and output Ports.
The 2 Phys should listen on the RX / TX wires.

The Phy is configured as below:
* Auto MDX is OFF 2k2 Pulldown on PIN 41
* Auto Auto-Negotiation is OFF  2k2 Pulldown on PIN 26
* Force Mode to Full duplex 100Mbit
-  AN0 = 1  Pullup 2K2 to PIN 28
-  AN1 = 1  Pullup 2K2 to PIN 27

Problem Description:
Despite the configuration, the phy still sends pulses to the RX + pins.
How can I get that the phy only receives telegrams?
Are there some Register settings?

Thank You.

DP83848_TAP.pdf