Hard Processor System Technical Reference Manual: Agilex™ 5 SoCs
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13.4.2.4.1. DDR Firewalls
The MPFE NoC implements a firewall on the output of the CCU_DMI0, CCU_DMI1, and F2SDRAM initiator NIUs that support 8 memory regions. The firewall region can be configured by software to be as small as 64 kbytes or as large as 128 Gbytes, aligned to a 64 kbyte boundary. AxUSER[7:0] is utilized to determine which masters have access to a region.
The firewall checks the Secure bit of a transaction against the Secure state of the slave. A transaction that passes the firewall proceeds normally to the Slave. A transaction that fails the Firewall receives an error response with random data. Transactions that fail the firewall must never be presented to the Slave interface.