Hard Processor System Technical Reference Manual: Agilex™ 5 SoCs
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4.1.5.3.3. Coherent Write Request
The following figure shows the 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.