I'm slowly building a hardware-based web server.

Feel free to look around, but it is not yet anywhere near working

Status
======
* ARP replies sent at Gigabit speeds
* ICMP is working at Gigabit speeds
* UDP RX & TX works at Gigabit speeds

TODO LIST OF MINOR ISSUES THAT I DON'T WANT TO FORGET
=====================================================

Inbound packet processing
-------------------------
* Inbound packet reception errors should cause the packet to be dropped.

* Inbound packet CRC verification is not being performed - should cause 
  packet to dropped

* Inbound packet MAC filtering not coded - should only accept packets 
  for 'our_mac' or the broadcast MAC. This could be handled the same as 
  CRC or reception errors (where  the FIFO can be rolled back). Doing this
  in one place could save resources.

TCP/IP Session protocol
-----------------------
* Can establish a TCP/IP session
* Sends ACKs for incoming data
* Currently listens on port 80 for any incoming connections
* Replies with 'FPGA says "Hi"\r\n' to any incoming packets that contains data
* Tears down session when remote end closes

TCP/IP packet support - mostly finished
---------------------------------------
* TCP RX IP Checksum is not being validated
* TCP RX TCP Checksum is not being validated

UDP Support - mostly finished
-----------------------------
* UDP TX cannot send a packet without any data

* UDP RX IP Checksum is not being validated
* UDP RX UDP Checksum is not being validated
* UDP RX of a packet with no data will not result in anything that the 
  consuming design can see.

ICMP Support - mostly finished
------------------------------
* ICMP 'echo request' is not validating that the IP checksum is correct
* ICMP 'echo request' is not validating that the ICMP length field is correct.
* ICMP 'echo request' is not validating that the ICMP checksum is correct

Outbound packet processing
--------------------------
* Outbound packets are not being sent correctly for 10 & 100Mbps speed. 
  This requies a 4k FIFO, which will block the arbiter when less than 
  1600 entries are free (enough for a packet and some loop latency)