Low-density parity-check decoder disparity preprocessing

摘要

Described embodiments provide a media controller that performs error correction on data read from a solid-state media. The media controller receives a read operation from a host device to read one or more given read units of the solid-state media. The media controller reads the data for the corresponding read units from the solid-state media employing initial values for one or more read threshold voltages. Only if a disparity between an actual number of bits at a given logic level included in the read data and an expected number of bits at the given logic level included in the read data has not reached a predetermined threshold, the media controller decodes the read data and provides the decoded data to the host device.

主权项

1. A method of error correcting, by a media controller, user data stored in a solid-state media, the method comprising:
by the media controller:
receiving a read operation from a host device coupled to the media controller, the read operation corresponding to one or more given read units of the solid-state media;reading data for the corresponding read units from the solid-state media employing initial values for one or more read threshold voltages;determining if a disparity between an actual number of bits at a given logic level included in the read data and an expected number of bits at the given logic level included in the read data has reached a predetermined threshold; only if the disparity has not reached the predetermined threshold:
decoding the read data; andproviding the decoded data to the host device;wherein the user data has the expected number of bits at the given logic level when written to the solid-state media.