Hard Processor System Technical Reference Manual: Agilex™ 5 SoCs

ID 814346
Date 4/01/2024
Public
Document Table of Contents

4.1.5.3.3. Coherent Write Request

The following figure shows the coherent write request.

Figure 23. Coherent Write Request

In a coherent write request:

  • CMD message is likewise issued to a DCE.
  • DCE effectively performs a coherent clean transaction to ensure that memory has been updated and that all copies of data have been invalidated.
  • At that point, the directory issues the STR message, and upon receiving the STR message, the AIU issues a DTW message to a DMI to update the memory with the write value.

Upon receiving the DTW message, the DMI performs a memory write transaction, and after the memory has been updated, the STR response phase is performed by DCE.