Patent ID: 9411679
Filing Date: 2016-08-09
CPC Classification: G06F,G11C,H01L

Claim Text:
1. A code modulation decoder for a flash memory system, the code modulation decoder comprising: a first hard detector configured to receive code-modulated data stored in a plurality of memory cells of a flash memory system and detect a first code word corresponding to a first data significant level from the code-modulated data; a first error correction code (ECC) decoder configured to correct an error of the detected first code word to form an error-corrected first code word and remove first parities from the error-corrected first code word to generate a first bit vector; a first subset selector configured to detect a first level subset based on the error-corrected first code word; and a second hard detector configured to receive the code-modulated data and detect a second code word corresponding to a second data significant level from the code-modulated data based on the first level subset.