protect Pheripheral with MPU

[Yellen]

Hi,

Can MPU protect registers of Pheripherals? 

If the answer is yes, which MPU slave port does the pheriheral belong?

Snipaste_2023-06-13_17-38-20.png

[Robin_Shen]

Hi Yellen,

Please read Chapter 16 Peripheral Bridge (AIPS-Lite) of S32K1xx MCU Family - Reference Manual

And you can refer to:
How to use s32k144 aips?
aips_demo_s32k118.zip

Best Regards,
Robin
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[Yellen]

Hi Robin,

Thanks for your response.

Refer to the Chapter 16, the MPU will not cover peripheral access protection. The pheriherals are protected by AIPS. Right?

But how to understand the MPU register can be protected by MPU as said below?

Snipaste_2023-06-13_17-38-20.png

[Robin_Shen]

14.1.2 Crossbar Switch slave assignments The following table identifies the slaves connected to the Crossbar Switch and whether the system MPU protects them.
System MPU does not protect access to peripheral registers, including system MPU's own registers. Protection is built into Peripheral Bridge (AIPS-Lite).

System MPU does not protect access to peripheral registers, including system MPU's own registers.jpg

I also can't understand: If the MPU registers are protected by the MPU

[Yellen]

Suppose the MPU's register address is included in one region descriptor, will MPU report error if illegal access to MPU's register occured?

[Robin_Shen]

I don't think so, but you can test it out.