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In computer networking, a flit (flow control unit or flow control digit) is a link-level atomic piece that forms a network packet or stream.[1] The first flit, called the header flit holds information about this packet's route (namely the destination address) and sets up the routing behavior for all subsequent flits associated with the packet. The header flit is followed by zero or more body flits, containing the actual payload of data. The final flit, called the tail flit, performs some book keeping to close the connection between the two nodes.
A virtual connection holds the state needed to coordinate the handling of the flits of a packet. At a minimum, this state identifies the output port of the current node for the next hop of the route and the state of the virtual connection (idle, waiting for resources, or active). The virtual connection may also include pointers to the flits of the packet that are buffered on the current node and the number of flit buffers available on the next node.[2]: 237
- ^ "Archived copy" (PDF). Archived from the original (PDF) on 2015-03-20. Retrieved 2018-10-25.
{{cite web}}: CS1 maint: archived copy as title (link) - ^ William James Dally; Brian Towles (2004). "13.2.1". Principles and Practices of Interconnection Networks. Morgan Kaufmann Publishers, Inc. ISBN 978-0-12-200751-4.