Intel® Stratix® 10 Hard Processor System Technical Reference Manual

ID 683222
Date 11/28/2022
Public

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4.5.3. I/O Coherency Bridge

The I/O coherency bridge (IOCB) manages I/O coherent accesses from the Cortex® -A53 MPCore™ , FPGA, TCU, and peripheral masters interfacing to the system interconnect.

These masters send both non-coherent and I/O coherent traffic to the IOCB. If a master issues a WriteUnique or WriteLineUnique ACE protocol request and that address corresponds to a cache line, the IOCB notifies the Cortex® -A53 MPCore™ processor to invalidate that data. The IOCB prefetches coherent permissions for requests from the coherency directory so that it can execute these requests in parallel with non-coherent requests and maintain high bandwidth.