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nor flash memory and its patching method

A flash memory, storage block technology, applied in static memory, instruments, etc., can solve the problem of difficult characteristics of NOR flash memory components, and achieve the effect of maintaining quality and prolonging service life

Active Publication Date: 2018-10-19
WINBOND ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the evolution of production and cost considerations, it is becoming more and more difficult to make NOR flash memory meet all device characteristics

Method used

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  • nor flash memory and its patching method
  • nor flash memory and its patching method
  • nor flash memory and its patching method

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Embodiment Construction

[0023] Please refer to figure 1 , figure 1 A method for repairing NOR flash memory according to an embodiment of the present invention is shown. Analyzing the application level of NOR flash memory, the more common one is the Basic Input Output System (BIOS) used to store boot codes. From the perspective of various electronic devices that NOR flash memory may be applied to, users of NOR flash memory do not perform programming (program) and erasing (erase) actions on NOR flash memory storage blocks. Usually, taking the boot code as an example, the main program will be placed on a memory block with a fixed address, and the main program will only be changed when the firmware is updated. That is to say, the probability of program erasure that may occur in the memory block occupied by the main program is relatively low.

[0024] It can be seen from the above description that only some of the storage blocks of NOR flash memory used for calculation and recording will be programmed ...

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Abstract

The present invention provides a NOR flash memory and a repair method thereof. The repair method comprises: determining whether at least a spare memory block is not used; counting the programmed number of each memory block and the erased number of each memory block; distinguishing whether the programmed number is not less than a first preset threshold value, and whether the erased number is not less than a second preset threshold value; and when the corresponding programmed number of the selected memory block is not less than the first threshold value or the erased number is not less than the second preset threshold value, using at least one spare memory block to replace the selected memory block.

Description

technical field [0001] The present invention relates to a NOR flash memory, and in particular to a repair method for a NOR flash memory. Background technique [0002] With the continuous evolution of flash memory manufacturing specifications, the decline in the durability of flash memory chips will be an important issue that must be faced under cost considerations. In NOR flash memory, its application environment is quite different from that of NAND flash memory. In consideration of cost, NOR flash memory does not have an external control chip to cooperate with. Therefore, it is difficult to increase the service life of NOR flash memory through complex algorithms. [0003] Usually, NOR flash memory is used to store important data such as boot codes. And this type of data usually cannot tolerate any single bit error. Therefore, in the existing technology of NOR flash memory, it is necessary to apply the most rigorous method for production from the design end to the manufac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11C29/44
Inventor 吴尚融张雅俊
Owner WINBOND ELECTRONICS CORP