Cypress S6J3200 Series, Manual

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CHAPTER 31:Memory Protection Unit for AXI
S6J3200 Series Hardware Manual Document Number: 002-04852 Rev. *G 1157
4.10.
MPU AXI Unlock Register (MPUXn_UNLOCK)
The software can use this register to lock or unlock the MPU AXI registers for write access.
 MPUXn_UNLOCK
MPUXn_UNLOCK
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
U
N
LOC
K
[3
1]
U
N
LOC
K
[3
0]
U
N
LOC
K
[2
9]
U
N
LOC
K
[2
8]
U
N
LOC
K
[2
7]
U
N
LOC
K
[2
6]
U
N
LOC
K
[2
5]
U
N
LOC
K
[2
4]
U
N
LOC
K
[2
3]
U
N
LOC
K
[2
2]
U
N
LOC
K
[2
1]
U
N
LOC
K
[2
0]
U
N
LOC
K
[1
9]
U
N
LOC
K
[1
8]
U
N
LOC
K
[1
7]
U
N
LOC
K
[1
6]
U
N
LOC
K
[1
5]
U
N
LOC
K
[1
4]
U
N
LOC
K
[1
3]
U
N
LOC
K
[1
2]
U
N
LOC
K
[1
1]
U
N
LOC
K
[1
0]
U
N
LOC
K
[9
]
U
N
LOC
K
[8
]
U
N
LOC
K
[7
]
U
N
LOC
K
[6
]
U
N
LOC
K
[5
]
U
N
LOC
K
[4
]
U
N
LOC
K
[3
]
U
N
LOC
K
[2
]
U
N
LOC
K
[1
]
U
N
LOC
K
[0
]
R
0W
P
R
0W
P
R
0W
P
R
0W
P
R
0W
P
R
0W
P
R
0W
P
R
0W
P
R
0W
P
R
0W
P
R
0W
P
R
0W
P
R
0W
P
R
0W
P
R
0W
P
R
0W
P
R
0W
P
R
0W
P
R
0W
P
R
0W
P
R
0W
P
R
0W
P
R
0W
P
R
0W
P
R
0W
P
R
0W
P
R
0W
P
R
0W
P
R
0W
P
R
0W
P
R
0W
P
R
0W
P
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Bit Position Bit Field Name Bit Description
[31:0] UNLOCK
MPU AXI Unlock
The MPU AXI Unlock Register protects the MPU AXI module from being
modified accidently by software. The MPU AXI registers cannot be written
until this register has been written with a specific unlock value. The correct
value for unlocking can be written only in privileged mode. Reading this
register always returns a zero. To lock the MPU AXI again software must write
another value specific to lock. Write access to MPU AXI registers without
unlocking or writing a value other than the lock or unlock values to this
register causes a protection error.
Notes:
This register can not be written by 8-bit or 16-bit write access; any such
access causes protection error.
For more details on lock and unlock values, refer to the device specific
datasheet.