Fault injection method for Nand Flash simulation model with controllable bit flipping

Abstract

The invention discloses an injection method for a Nand Flash simulation model with controllable bit flipping. The injection method comprises the following steps: a), judging a bit flipping mode; b), randomly generating a bit flipping quantity; c),artificially setting the bit flipping quantity; d), establishing Err_pos_gen, and defining a fault position variable Err_pos; e), estabilihsing an Injet_err type, establishing a two-dimensional array which is 2<N>-1 deep and 8bit wide; f) defining a flipping bit, defining a bit flipping variable err_mum_one_byte, assigning the err-bit by utilizing a principle of corresponding a value 1 in err_mum_one_byte, to the flipping bit position of 8bit data in a Nand Flash page; g) performing data fault injection operation, performing xor operation on data in the err_bit and the data in io_data_buf; h) judging fault correcting capacity. The coding error-correcting verification method can be used for performing quantity and position controllable verification method in Nand Flash page, flexibly increasing data bit random fault inseration an beneficial to quickly completing NFC verification more comprehensively.

Description

technical field [0001] The present invention relates to a kind of error note method of Nand Flash emulation model that bit flipping is controllable, more specifically, relate to a kind of encoding error correction verification method of Nand Flash controller that can control the number and position of flipped bits . Background technique [0002] Although the existing Nand Flash simulation model realizes the functions of reading, writing, erasing, and timing inspection of Nand flash operations, when verifying the error correction coding function of the flash memory controller (Nand Flash Controller, NFC), the random insertion of stored data bits The wrong function is difficult to implement. [0003] Nand flash (flash memory) has the advantages of small storage unit area, fast programming speed, short erasing time, and low power consumption. It has become a very popular mass storage medium in the industry. However, all Nand Flash devices are subject to bit flipping. troubled...

AI Technical Summary

Problems solved by technology

[0004] Existing Nand Flash simulation models generally use the idea of ​​front-end RTL design and are written and implemented in Verilog language. Although this method can also realize the simple bit flip function of the Nand Flash model, the operation method is complicated and the controllability is poor, which cannot meet the needs of verification engineers. Randomized control over bit flips and number of bit flips while simulating

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