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16.5.3.1 FlexNVM Block Partitioning for FlexRAM
The user can configure the FlexNVM block as either:
• Basic data flash,
• EEPROM flash records to support the built-in EEPROM feature, or
• A combination of both.
The user's FlexNVM configuration choice is specified using the Program Partition
command described in
.
CAUTION
While different partitions of the FlexNVM block are available,
the intention is that a single partition choice is used throughout
the entire lifetime of a given application. The FlexNVM
partition code choices affect the endurance and data retention
characteristics of the device.
16.5.3.2 EEPROM User Perspective
The EEPROM system is shown in the following figure.
File
system
handler
User access
(effective
EEPROM)
FlexRAM
EEPROM backup
with 2KByte
erase sectors
Figure 16-7. Top Level EEPROM Architecture
To handle varying customer requirements, the FlexRAM and FlexNVM blocks can be
split into partitions as shown in the figure below.
1. EEPROM partition (EEESIZE) — The amount of FlexRAM used for EEPROM
can be set from 0 Bytes (no EEPROM) to the maximum FlexRAM size (see
). The remainder of the FlexRAM not used for EEPROM is not accessible while
the FlexRAM is configured for EEPROM (see
).
The EEPROM partition grows upward from the bottom of the FlexRAM address
space.
Chapter 16 Flash Memory Module (FTFE)
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
NXP Semiconductors
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