Tidal Systems/Micron Assigned Patent

Tidal Systems, Inc., Santa Clara, CA, (acquired by Micron Technology, Inc.) has been assigned a patent (10,176,041) developed by Wu, Yingquan, Palo Alto, CA, and Banaei, Armin, Sunnyvale, CA, for a “deterministic read retry method for soft LDPC decoding in flash memories.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A method is disclosed for performing LDPC soft decoding of data stored in a flash storage device. Upon occurrence of a hard read failure, one or more retries with soft decoding after each retry are performed until soft decoding is successful or a maximum iteration count is reached. For each retry thresholds for sensing a level of a cell are adjusted according to a specific sequence. Likewise, the LLR table for each retry is selected from pre-determined LLR tables each corresponding to a retry attempt and the thresholds used for the retry attempt. The LLR table is not adjusted between retries or based on outcomes of any retries. A step size by which thresholds adjusted may be tuned to improve performance”.

The patent application was filed on June 16, 2014 (14/305,958).