NXP Semiconductors MWCT101 S Series, Reference Manual

Page: 236 / 1761

The space defined by RGD2 with no overlap is a private data and stack area that provides
read/write access to CP0 only. The overlapping space between RGD2 and RGD3 defines
a shared data space for passing data from CP0 to CP1 and the access controls are defined
by the logical OR of the two region descriptors. Thus, CP0 has (rw- | r--) = (rw-)
permissions, while CP1 has (--- | r--) = (r--) permission in this space. Both DMA engines
are excluded from this shared processor data region. The overlapping spaces between
RGD3 and RGD4 defines another shared data space, this one for passing data from CP1
to CP0. For this overlapping space, CP0 has (r-- | ---) = (r--) permission, while CP1 has
(rw- | r--) = (rw-) permission. The non-overlapped space of RGD4 defines a private data
and stack area for CP1 only.
The space defined by RGD5 is a shared data region, accessible by all four bus masters.
Finally, the slave peripheral space mapped onto the IPS bus is partitioned into two
regions:
• One containing the MPU's programming model accessible only to the two processor
cores
• The remaining peripheral region accessible to both processors and the traditional
DMA1 master
This example shows one possible application of the capabilities of the MPU in a typical
system.
Application information
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
236 NXP Semiconductors