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F59L512M81A Datasheet(PDF) 11 Page - Elite Semiconductor Memory Technology Inc. |
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F59L512M81A Datasheet(HTML) 11 Page - Elite Semiconductor Memory Technology Inc. |
11 / 40 page ESMT F59L512M81A Elite Semiconductor Memory Technology Inc. Publication Date: May 2014 Revision: 1.0 11/40 Error in write or read operation Within its lifetime, additional invalid blocks may develop with NAND Flash memory. Refer to the qualification report for the actual data. The following possible failure modes should be considered to implement a highly reliable system. In the case of status read failure after erase or program, block replacement should be done. Because program status fail during a page program does not affect the data of the other pages in the same block, block replacement can be executed with a page-sized buffer by finding an erased empty block and reprogramming the current target data and copying the rest of the replaced block. In case of Read, ECC must be employed. To improve the efficiency of memory space, it is recommended that the read or verification failure due to single bit error be reclaimed by ECC without any block replacement. The additional block failure rate does not include those reclaimed blocks. Failure Mode Detection and Countermeasure sequence Erase failure Read Status after Erase → Block Replacement Write Program failure Read Status after Program → Block Replacement Read Up to 4 bits failure Verify ECC → ECC Correction Note : Error Correcting Code --> RS Code or BCH Code etc. Example: 4bit correction / 512 Byte Program Flow Chart |
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