S32K1xx EEPROM 介紹
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2019-04-30
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Using the S32K1xx EEPROM Functionality
by: NXP Semiconductors
1 Introduction
There are three methods to implement EEPROM functionality. One is using
real EEPROM such as KEA64 which has 256 B EEPROM. The advantage is
it doesn’t occupy the flash memory. But the disadvantage is, it is expensive.
The second method is using software to realize the EEPROM functionality such
as KEA8 and KEA128. The advantage is cheap. But the disadvantage is it
occupies the flash memory including the extra code for EEPROM realization
and the flash memory using to simulate EEPROM. The third method is using
firmware to realize the EEPROM functionality such as S32K1xx. The
advantage is the realization of EEPROM functionality is absolutely transparent
to customer and does not need flash memory to store extra code for EEPROM
implementation.
This application note mainly introduces S32K1xx EEPROM (EEE) functionality
feature and usage. The S32K1xx EEPROM (EEE) allows users to configure
some of the on-chip flash memory as enhanced EEPROM, additional flash
memory, or a combination of the two.
For detailed information for any reference mentioned during this application
note, please refer to S32K1xx Reference Manual and Datasheet.
2 S32K1xx EEPROM (EEE)
features
The S32K1xx EEPROM (EEE) has a number of features that allow the
replacement of external EEPROMs and improves upon their performance.
S32K1xx EEE features include:
• Automatic – does not require customer software development.
— Reset: EEE image loaded into RAM.
— Reads: Records read directly from RAM. No EEE operation.
— Writes: Records written directly to RAM. Image automatically synchronized with EEE flash.
• Utilizes best practices to optimize reliability and cycling endurance.
— Round robin load leveling.
— Sector retirement.
• Brownout tolerant.
Contents
1 Introduction..........................................1
2 S32K1xx EEPROM (EEE) features......1
2.1 S32K1xx EEE works...............2
2.2 How S32K1xx EEE uses
memory................................... 2
3 Using the S32K1xx EEE...................... 5
3.1 S32K1xx EEE partitioning.......5
3.2 S32K1xx FlexRAM
configuration..........................10
3.3 S32K1xx command error
handling.................................14
3.4 S32K1xx EEE startup........... 14
3.5 S32K1xx reading and
writing the EEE......................14
4 S32K1xx EEE performance............... 15
5 S32K1xx brownout detection............16
6 S32K1xx new quick write mode........16
7 S32K1xx EEPROM endurance.......... 17
8 Software considerations................... 18
8.1 Simultaneous operations.......18
8.2 Enabling CSEc and
EEPROM...............................18
8.3 Power-On recommendation...18
8.4 Data record checking............ 19
8.5 Power Modes transition.........19
9 Appendix A EEPROM examples....... 19
10 Revision history............................... 22
NXP Semiconductors
Document Number: AN11983
Application Note Rev. 1, March 2018
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