NRF9160-SICA-R7 datasheet(264/400 Pages) NORDIC

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Peripherals

RAMREGION[0].PERM

RAMREGION[N-1].PERM

Access

control

Access error

Error reporting

Address and control signals

Master identification

Events

Bus error

RAMREGION[n].PERM

SPU registers

Entire

RAM

System bus

Data bus

(read)

Region #1

Region #0

Region #n

Region #N-2

Region #N-1

Region

size

Data bus

(write)

Figure 83: Definition of the N=32 regions, each of 8 KiB, in the RAM memory space

6.15.3.1 Non-secure callable (NSC) region definition in RAM

The SPU provides support for the definition of non-secure callable (NSC) sub-regions to allow non-secure

to secure function calls.

A non-secure callable sub-region can only exist within an existing secure region and its definition is done

using two registers:

• RAMNSC[n].REGION, used to select the secure region that will contain the NSC sub-region

• RAMNSC[n].SIZE, used to define the size of the NSC sub-region within the secure region

The NSC sub-region will be defined from the highest address in that region, going downwards. Figure

below illustrates the NSC sub-regions and the registers used for their definition:

4418_1315 v2.0

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