• Region hit determination
• Detection of an access protection violation
The following figure shows a functional block diagram.
start
end
error
≥
≥
RGD
n
MPU_EDR
n
Access not allowed
≥
≤
hit_b
Address
(hit AND error)
(no hit OR error)
r,w,x
Figure 8-2. MPU access evaluation macro
8.5.1.1 Hit determination
To determine whether the current reference hits in the given region, two magnitude
comparators are used with the region's start and end addresses. The boolean equation for
this portion of the hit determination is:
region_hit = ((addr[31:5] >= RGDn_Word0[SRTADDR]) & (addr[31:5] <= RGDn_Word1[ENDADDR])) &
RGDn_Word3[VLD]
where addr is the current reference address, RGDn_Word0[SRTADDR] and
RGDn_Word1[ENDADDR] are the start and end addresses, and RGDn_Word3[VLD] is
the valid bit.
NOTE
The MPU does not verify that ENDADDR ≥ SRTADDR.
In addition to the comparison of the reference address versus the region descriptor's start
and end addresses, the optional process identifier is examined against the region
descriptor's PID and PIDMASK fields. A process identifier hit term is formed as follows:
pid_hit = ~RGDn_Word2[MxPE] |
((current_pid |
RGDn_Word3[PIDMASK]) == (RGDn_Word3[PID] | RGDn_Word3[PIDMASK]))
Chapter 8 Memory Protection Unit (MPU)
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
NXP Semiconductors
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