Intel® Quartus® Prime Standard Edition User Guide: Platform Designer

ID 683364
Date 12/15/2018
Public
Document Table of Contents

3.1.5.1. Round-Robin Arbitration

When multiple masters contend for access to a slave, Platform Designer automatically inserts arbitration logic which grants access in fairness-based, round-robin order.

In a fairness-based arbitration protocol, each master has an integer value of transfer shares with respect to a slave. One share represents permission to perform one transfer. The default arbitration scheme is equal share round-robin that grants equal, sequential access to all requesting masters. You can change the arbitration scheme to weighted round-robin by specifying a relative number of arbitration shares to the masters that access a given slave. AXI slaves have separate arbitration for their independent read and write channels, and the Arbitration Shares setting affects both the read and write arbitration. To display arbitration settings, right-click an instance on the System View tab, and then click Show Arbitration Shares.

Figure 88. Arbitration Shares in the Connections Column