External Memory Interface Handbook Volume 3: Reference Material

ID 683841
Date 7/24/2019
Public
Document Table of Contents

6.6.4.7. AXI-Exclusive Support

The single-port controller supports AXI‑exclusive operations. The controller implements a table shared across all masters, which can store up to 16 pending writes. Table entries are allocated on an exclusive read and table entries are deallocated on a successful write to the same address by any master.

Any exclusive write operation that is not present in the table returns an exclusive fail as acknowledgement to the operation. If the table is full when the exclusive read is performed, the table replaces a random entry.

Note: When using AXI‑exclusive operations, accessing the same location from Avalon-MM interfaces can result in unpredictable results.

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