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Table 23-2. Flash Protection Ranges (continued)
SAn and XAn
Bit
Protected Segment Address Range
Segment Size (Fraction
of total Flash)
0
0x0_0000_0000 – (Flash_size/32-1)
1/32
1
(Flash_size/32) – 2*(Flash_size/32-1)
1/32
........
31
31*(Flash_size/32) – 30*(Flash_size/32-1)
1/32
Individual segments within the flash memory can be independently protected from user
access and data access. Protection is controlled by the individual bits within the x_SACC
and x_XACC registers, as shown in the next figure.
Program flash size / 64
Program flash size / 64
Program flash size / 64
Program flash size / 64
Program flash size / 64
Program flash size / 64
Program flash size / 64
SA0/XA0
0x0000_0000
SA1/XA1
SA2/XA2
SA3/XA3
SA61/XA61
SA63/XA63
SA62/XA62
Program flash
Last program flash address
Access
Control bits
(SAn/XAn)
64 segments
Figure 23-1. Program flash protection (64 segments)
23.5.2.1 Interface Signals
Table 23-3. Interface Signals
Signal
Width
From
To
Description
xacc
64 or 32
FMU
Platform
Direct xacc (execute-only access control) register
sacc
64 or 32
FMU
Platform
Direct sacc (supervisor access control) register
numsg
8
FMU
Platform
NUMSG bit field - Binary encoded number of segments
0x40 for 64 segments
Table continues on the next page...
Chapter 23 Flash Memory Controller (FMC)
K32 L2A Reference Manual, Rev. 2, 01/2020
NXP Semiconductors
597
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