In processors supporting TrustZone, how is secure memory access protected from a non- secure world application accessing it?

For example, we define a region to be secure. If a non secure app is trying to acess that region, what protection mechanism exists in hardware which will prevent that?
In processors supporting TrustZone, how is secure memory access protected from a non- secure world application accessing it?

For example, we define a region to be secure. If a non secure app is trying to acess that region, what protection mechanism exists in hardware which will prevent that?
Trustzone ARM V8M Call cmse_ns_entry function from secure world...

Hi, I'm working on bare metal firmware using Cortex M55. Trustzone and use of cmse macros are enabled. Both secure world and non secure world are created and built. We want to call a secure service...
Trustzone ARM V8M Call cmse_ns_entry function from secure world...

Hi, I'm working on bare metal firmware using Cortex M55. Trustzone and use of cmse macros are enabled. Both secure world and non secure world are created and built. We want to call a secure service...
Reading non-secure world code memory from the secure world

Hi! I am currently using an ARM Cortex-M23 based Nuvoton M2351 with the Keil MDK IDE. I am trying to read non-secure domain code memory (stored at 0x10040XXX) from privileged secure world code. I...