Method and Apparatus for GPON GEM Error Correction Implementation

A device for data communication, comprising:

• a first circuit capable of performing a hash function, and configured to generate a hash value in response to a value of recalculated syndrome;
• a second circuit coupled to the first circuit and capable of obtaining a data entry from a lookup table in a memory in accordance with the hash value;
• a third circuit coupled to the second circuit and capable of generating an error vector in response to the data entry;
• and
• a fourth circuit coupled to the third circuit and configured to correct an error in a header portion of a data structure encapsulated in the GPON frame.

An apparatus for data transmission comprising:

• means for receiving a data structure encapsulated in a gigabit passive optical network (“GPON”) frame via an optical network;
• means for identifying a header portion indicating length of payload of data carried by the data structure;
• means for recalculating an x-bit syndrome from the header portion;
• means for obtaining a y-bit hash value in response to the x-bit syndrome, wherein y is a smaller integer than x;
• and
• means for correcting a bit error in the header portion in response to the hash value.

A device for enhancing data integrity, comprising:

• a syndrome logic configured to generate 12-bit syndromes in Bose, Chaudhuri, and Hocquengham (“BCH”) (63, 12, 2) code in accordance with 40-bit head data;
• a hash circuit coupled to the syndrome logic and configured to hash the 12-bit syndrome into an 8-bit hash value with a property of 0 to 5 different syndrome values;
• a key circuit coupled to the syndrome logic and capable of mapping 12-bit syndromes into 4-bit key values, wherein each syndrome value has a unique 4-bit key value within all syndromes that have same hash value;
• and
• a vector circuit coupled to the key circuit and configured to identify non-correctable errors from the syndrome in response to the hash value and the key value.