The supported traffic classes in priority order are as follows:
- Low Latency
- The NoC compiler minimizes the structural latency while satisfying the bandwidth requirement. Low latency traffic receives a high priority at all switch and memory controller arbitration points. The low latency traffic class only applies to read traffic.
- Isochronous
- Includes a mechanism to guarantee the maximum latency of DDR memory traffic.
Isochronous traffic is treated as high priority (low latency) traffic
through the NoC. When the request is delivered to the DDRMC queue a timeout
counter is started. If the timeout is reached, the request is moved to the
front of the queue.Note: In the current release you cannot specify the isochronous timeout latency.
- Best Effort
- The NoC compiler works to satisfy the bandwidth and latency requirements after low latency and isochronous path requirements have been satisfied. Latency values are associated with the egress port (NoC slave). Best effort transactions receive the lowest arbitration priority throughout the NoC.