SAM3X8E Atmel Corporation, SAM3X8E Datasheet - Page 203

• Manufacturer Part Number: SAM3X8E
• Manufacturer: Atmel Corporation

Region enable bit.
For information about access permission, see
11.23.5.1
11.23.6
11057A–ATARM–17-Feb-12
11057A–ATARM–17-Feb-12
MPU access permission attributes
SIZE field values
The SIZE field defines the size of the MPU memory region specified by the RNR. as follows:
The smallest permitted region size is 32B, corresponding to a SIZE value of 4.
example SIZE values, with the corresponding region size and value of N in the RBAR.
Table 11-36. Example SIZE field values
1.
This section describes the MPU access permission attributes. The access permission bits, TEX,
C, B, S, AP, and XN, of the RASR, control access to the corresponding memory region. If an
access is made to an area of memory without the required permissions, then the MPU generates
a permission fault.
Table 11-37
Table 11-37. TEX, C, B, and S encoding
SIZE value
b00100 (4)
b01001 (9)
b10011 (19)
b11101 (29)
b11111 (31)
TEX
b000
In the RBAR, see
(Region size in bytes) = 2
C
0
1
shows the encodings for the TEX, C, B, and S access permission bits.
B
0
1
0
1
Region size
32B
1KB
1MB
1GB
4GB
“MPU access permission attributes”
S
x
x
0
1
0
1
(1)
(1)
“MPU Region Base Address Register” on page
Memory type
Strongly-
ordered
Device
Normal
Normal
Value of N
10
20
30
5
b01100
(1)
(SIZE+1)
Shareability
Shareable
Shareable
Not
shareable
Shareable
Not
shareable
Shareable
Note
Minimum permitted size
-
-
-
Maximum possible size
.
Other attributes
-
-
Outer and inner write-through. No write
allocate.
Outer and inner write-back. No write
allocate.
201.
SAM3X/A
SAM3X/A
Table 11-36
gives
203
203