Patent ID: 11869584
Assignee: SILICON MOTION, INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 3:
4. A Flash memory access module for performing memory access management of a Flash storage device comprising a plurality of storage cells, the Flash memory access module comprising:
a read only memory for storing a program code; and
a microprocessor, coupled to the read only memory, for executing the
program code to perform the following steps:
for a Flash cell of the Flash storage device, performing a a first sensing operation to generate a first digital value and performing a plurality of second sensing operations to generate a second digital value of the Flash cell, the second digital value representing at least one candidate threshold voltage of the Flash cell;
determining a threshold voltage of the Flash cell according to whether the at least one candidate threshold voltage is high or low;
determining soft information of a bit stored in the Flash cell according to the threshold voltage of the Flash cell; and
using the soft information to perform soft decoding;

wherein when a result of the first sensing operation is that current flows through the Flash cell, the subsequent second sensing operation will correspond to a sensing voltage which is less than a sensing voltage corresponding to the first sensing operation, when a result of the first sensing operation is that current does not flow through the Flash cell, the subsequent second sensing operation will correspond to a sensing voltage which is higher than a sensing voltage corresponding to the first sensing operation.