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We have two different types of MPAX. One is located in the C66x core and explained in the section 7.3 XMC Memory Protection and Address eXtension (MPAX) of SPRUGW0B (http://www.ti.com/lit/ug/sprugw0b/sprugw0b.pdf). On the other hand, when EDMA access the memory, it pass a different MPAX and it is explained in the section 2.2 Memory Protection and Address Extension (MPAX) of SPRUGW7A (http://www.ti.com/lit/ug/sprugw7a/sprugw7a.pdf).
The following presentation material is also helpful to understand them.
