Enable Packetization of Data

[AdDraw]

Split each Packet into flits:

• [x] Header Flit ( must appear once)
• [x] Body/Payload Flit (might be 0)
• [x] Tail Flit (must appear once)

Packet should vary in length and width

At the start let's assume:

• Length is up to 64 Flits
• Flit holds an FLIT ID that is 2 bit wide( 01 - Header, 10 - Body, 11 - Tail )
• Flit Payload equals 1Byte (depends on the address that needs to be stored in the Header and on the implemented Hop Count)

This should allow for 62B payload packets that have 2 bits per dimension address in XY routing & 4 bits other info)

[AdDraw]

First steps in the wormhole_xy_mesh branch.

Packetization of data implemented with a virtual_channel introduction.

• HEADER = 2'b10
• BODY = 2'b01
• TAIL = = 2'b11

Slight modification vs what is written in the ISSUE( not critical)

[AdDraw]

Done in #18.

FLIT ID is 2 bit wide FLIT PAYLOAD width can be arbitrary.

• HEADER and TAIL must appear at least once.
• TAIL can store valid payload.
• HEADER has addr at the MSBs of the DATA section of the flit

Packet Lenght can be arbitrary.