How to test the LDPC of 3D NAND?
With the widely promotion of 3D NAND Flash in the market, LDPC has became a key marketing advertisement by all flash vendors. From the point of ECC, there is indeed no more powerful error correction algorithm than LDPC. But on the contrary, there also exists disagreements. Although the LDPC has been used by HDD for years, it is still unverified by the market when used in NAND Flash. In theory, LDPC is also with own defects. 1. The latency time of LDPC is extremely long due to the process of iteration. 2. The Soft Information is necessary. It’s easy to get the Soft Information of HDD at once, but it’s difficult to get the accurate Soft Information of NAND Flash. Once you get the wrong information, the result could be disastrous. Because the LDPC need to calculate the probability with the Soft Information, if the decoder of LDPC gets the wrong Soft Information, it will lead the wrong inform...


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