Integration of FlooNoC built-in collectives in the MAGIA NoC

[ccarlotta]

This PR integrates the built-in FlooNoC collective in the MAGIA NoC

• Supported collectives:
  • Narrow channel
    • Multicast column, multicast row, multicast mesh (broadcast)
    • Sync column, sync row, sync mesh
    • Reduce INT
  • Wide channel
    • Multicast column, multicast row, multicast mesh

How to launch a collective:

• Narrow channel
  • The nodes taking part to the collective set up the mask and collective op field. An AXI transaction is recognized as a collective operation if the AW_ADDR is an offset of 0xB0000000. In this circumstance, the collective_gen module sets up the user field with the mask and collective op fields. The user filed of the axi transaction will be then decoded by FlooNoC and processed accordingly.
• Wide channel
  • The wide channel is used uniquely by the iDMA. Thus, when a multicast data movement is requested, the iDMA should be carefully programmed via ad-hoc registers.