Hard Processor System Technical Reference Manual: Agilex™ 5 SoCs

ID 814346
Date 7/19/2024
Public

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4.3.3.5. APB4 Programming Interface

This interface enables the CPUs to read and write configuration registers in the MMU-600.

Based on the parameter setting, TCUCFG_NUM_TBU as 14, the APB address required for TCU is 21-bit. Although SMMU needs only 21-bit (2MB) address, but 16MB address (24-bit) space is allocated. For software, firmware, and validation, accesses to SMMU should be restricted to only 21-bit (2MB) of address space. Any access over the 2MB is unknown behavior for SMMU.