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Compiler/DP83867IR: Ethernet Link down problem

Part Number: DP83867IR

Tool/software: TI C/C++ Compiler

In Vivado 2018.2, I did  Microblazed Design of Ethernet  using internal Block RAM

I am facing “Ethernet Link down” problem , please give me the solution.

-----lwIP TCP echo server ------

TCP packets sent to port 6001 will be echoed back

link speed: 100

Ethernet Link down

DHCP Timeout

Configuring default IP of 192.168.1.10

Board IP: 192.168.1.10

Netmask : 255.255.255.0

Gateway : 192.168.1.1

TCP echo server started @ port 7