Intel® Arria® 10 Hard Processor System Technical Reference Manual

ID 683711
Date 1/10/2023
Public

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8.2.11.3.1. Limiter Mode

In limiter mode, transactions from the initiator are limited to a specific bandwidth.

The QoS generator controls the initiator's access to the interconnect, by monitoring the amount of data transmitted and received in a sliding time window.

The purpose of limiter mode is to place a hard bound on the initiator's throughput. This avoids flooding the interconnect with transactions from that initiator. When a programmable bandwidth threshold is exceeded, the initiator is stalled, and stops accepting new requests. As the time window moves forward, the total bandwidth usage in the window falls, and the initiator resumes accepting requests.

In limiter mode, the QoS generator combines read and write requests to determine the bandwidth usage.