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XC866L-4FR Datasheet(PDF) 70 Page - Infineon Technologies AG |
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XC866L-4FR Datasheet(HTML) 70 Page - Infineon Technologies AG |
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70 / 396 page  XC866 Flash Memory User’s Manual 4-4 V 0.2, 2005-01 Flash Memory, V 0.3 The D-Flash bank is divided into more physical sectors for extended erasing and reprogramming capability; even numbers for each sector size are provided to allow greater flexibility and the ability to adapt to a wide range of application requirements. For example, the user’s program can implement a buffer mechanism for each sector. Double copies of each data set can be stored in separate sectors of similar size to ensure that a backup copy of the data set is available in the event that the actual data set is corrupted or erased. Alternatively, the user can implement an algorithm for EEPROM emulation, which uses the D-Flash bank like a circular stack memory; the latest data updates are always programmed on top of the actual region. When the top of the sector is reached, all actual data (representing the EEPROM data) is copied to the bottom area of the next sector and the last sector is then erased. This round robin procedure, using multifold replications of the emulated EEPROM size, significantly increases the endurance. To speed up data search, the RAM can be used to contain the pointer to the valid data set. |
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