Hard Processor System Technical Reference Manual: Agilex™ 5 SoCs

ID 814346
Date 11/27/2024
Public
Document Table of Contents

4.1.5.1.1. Coherent Agent Interface Unit (CAIU)

There is a single CAIU interface, CAIU0 supporting the CHI-B fully-coherent protocol.

The following credit counters are implemented for each CAIU:

  • CMD message credit counter per instance of DCE
  • CMD message credit counter per instance of DMI
  • CMD message credit counter per instance of DII
  • CMD message credit counter for DVE which limits the number of DVM commands

For each CAIU, the following resources are implemented based on message credits:

  • Snoop transaction table: This transaction table is sized based on SNP message credits

The following resources are implemented per CAIU:

  • Outstanding transaction table control entries which limit the number of outstanding transactions CAIU can have at a given time