Difference between revisions of "XMC4xxx series"
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That way no memory gets wasted. |
That way no memory gets wasted. |
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| − | The J-Link uses only the physical sectors when erasing and writing to flash, because there are disadvantages when using logical sectors that need to be taken into account |
+ | The J-Link uses only the physical sectors when erasing and writing to flash, because there are disadvantages when using logical sectors that need to be taken into account: |
*Writing into logical flash sectors disturbs adjacent data in the remaining logical sectors and thus increasing the risk of having incorrect data stored in the remaining memory sectors |
*Writing into logical flash sectors disturbs adjacent data in the remaining logical sectors and thus increasing the risk of having incorrect data stored in the remaining memory sectors |
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*Decrease of total flash erase cycles possible as a logical sector access promotes uneven memory degradation |
*Decrease of total flash erase cycles possible as a logical sector access promotes uneven memory degradation |
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| + | See the Infineon manual for more information. |
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Nevertheless the possibility exists to override this behavior of the J-Link. To learn how please visit the following page: |
Nevertheless the possibility exists to override this behavior of the J-Link. To learn how please visit the following page: |
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Revision as of 17:23, 13 March 2017
Contents
This article describes device specifics of the Infineon XMC 4500 microcontroller.
Flash sector limitations
The Infineon XMC 4500 MCU comes with the following physical sectors:
- 2 * 64 kB
- 1 * 128 kB
- x * 256 kB
The first 64 kB for example are split up in 4 * 16 kB logical sectors which can be accessed individually. That way the flash memory in the first physical sector can be used for different scenarios where not the whole memory is needed to store the application. For example if a bootloader is used together with a application it can be beneficial to store the bootloader e.g. in the first logical sector and the application starting from the second logical sector. That way no memory gets wasted.
The J-Link uses only the physical sectors when erasing and writing to flash, because there are disadvantages when using logical sectors that need to be taken into account:
- Writing into logical flash sectors disturbs adjacent data in the remaining logical sectors and thus increasing the risk of having incorrect data stored in the remaining memory sectors
- Decrease of total flash erase cycles possible as a logical sector access promotes uneven memory degradation
See the Infineon manual for more information.
Nevertheless the possibility exists to override this behavior of the J-Link. To learn how please visit the following page:
