Patent ID: 6883130

Claim:
A method of receiving a codeword that comprises one or more information bits, a first set of error detection check bits and a second set of error detection check bits, the method comprising: using the first set of error detection check bits to make a first determination whether the one or more information bits are error-free; using the second set of error detection check bits to make a second determination whether the one or more information bits and the first set of error detection check bits are error-free; accepting the one or more information bits only if the first determination indicates that the one or more information bits are error-free and the second determination indicates that the one or more information bits and the first set of error detection check bits are error-free; and determining whether a first level of error detection or a second level of error detection is to be used, wherein using the second set of error detection check bits to make the second determination whether the one or more information bits and the first set of error detection check bits are error-free, and accepting the one or more information bits only if the first determination indicates that the one or more information bits are error-free and the second determination indicates that the one or more information bits and the first set of error detection check bits are error-free are performed only if the second level of error detection is to be used.