The Strict Priority Scheduler always selects a request from the Shaper first. A request can only be scheduled from the Management Request FIFO if the Lookup Request FIFO is empty or if the Shaper is rate limiting.
When the Management Request FIFO becomes full, the AXI4-Slave stops accepting new Management Requests to prevent loss of Management Requests.
For every Lookup Request processed by the CAM database, a Lookup Response is generated. The Lookup Response is sent to the Lookup Response Interface. For a read Management Request, the response is sent to the Management Response Interface. Write Management Requests do not generate a Management Response. The Management Response Interface can only buffer one Management Response. The AXI4-Slave blocks the CPU read operation until the Management Response is available in the Management Response FIFO. This blocking efficiently limits the number of outstanding reads to one, preventing the FIFO from overflowing.