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VHDL IP Stack

Changes to existing code required for sending an ARP frame.

1. The component responsible for sending ARP packet is ethernet sender (MASSnd : ethernetSnd).
2. It had all parts of the ARP done well except for the ARP data pad (all zero padded at the end).
3. The core was trying to read from an initialized part of the memory instead of just writing zeros.
4. A new signal was defined to drive the ARP pad data on the TX data lines. The signal is cleared when ARP pad ends and CRC starts.
5. The waveform shows its operation.

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