Via Technologies, Inc.

Tian Holdings, LLC

Ching-Yu Chen

Chiung-Ying Peng

Yi-Lin Lai

Meng-Huang Chu

Pei-Jei Hu

Chen-Te Chen

Dao-Ning Guo

An error checking and correcting (ECC) decoding method and apparatus are provided. A decoding circuit decodes a codeword using (or without using) reference information, wherein when the decoding circuit fails to decode a first codeword, the decoding circuit decodes a second codeword to produce decoded data. The decoding circuit checks whether a change has occurred from each codeword bit of the second codeword to a corresponding bit of the decoded data. In accordance with a bit position of the changed corresponding bit, the decoding circuit correspondingly changes the first codeword to a modified codeword, and/or correspondingly changes the reference information to modified information. The decoding circuit performs the ECC decoding again on the modified codeword (or the first codeword) using (or without using) the modified information.

Error checking and correcting decoding method and apparatus

A method for generating error detection code is disclosed. Firstly, a first error detection code PEDC is derived by using 12-byte unknown sector data information including ID, IED, RSV and the 2048-byte main data while the main data is delivered from a host. Secondly, a second error detection code MEDC is obtained by using known 12-byte sector data information including ID, IED, RSV and the 2048-byte main data. Thereafter, the real error detection code EDC is obtained by applying an exclusive-OR operation to both the PEDC and MEDC.

Method of generating error detection codes

An apparatus and method for accessing data from a storage medium is disclosed. The apparatus fetches a data block from the storage medium via an accessing unit, and corrects an error of the data block by an error correction code (ECC) decoder according to an ECC of the data block. The apparatus also includes an error detection code (EDC) processor for calculating an EDC of each data sector of the data block, and a flag register for storing a flag associated with each data sector. The method includes re-fetching a data sector if the associated flag indicates the EDC of the data sector is incorrect; and bypassing a data sector if the associated flag indicates that the EDC of the data sector is correct, even though the ECC of the data block indicates that the data sector contains an error.

Data accessing apparatus and method

Growing community of inventors

Taipei, Taiwan

Ching-Yu Chen