FEC codec module

A forward error correction (FEC) codec module, comprising an encoding module and an error correction module;

• wherein
• the encoding module comprises:
• a first data interleaving module, four encoding calculation units, an encoding unit and a data selector;
• the first data interleaving module is configured to perform an interleaving and reorganizing process on two paths of source data input to the first data interleaving module according to a preset method, and respectively send one high byte data and one low byte data in each of two cycles of the source data after the interleaving and reorganizing process to corresponding four encoding calculation units, wherein each one of the four encoding calculation units obtains one corresponding high byte data or one corresponding low byte data in every two cycles;
• each one of the four encoding calculation units is configured to perform a loop iterative calculation on obtained continuous 60 bytes of data, to obtain two parity values;
• the encoding unit is configured to obtain parity values calculated by the four encoding calculation units, and perform a polarity encoding process on the parity values;
• and
• the data selector is configured to obtain a polarity-encoded parity value, insert the polarity-encoded parity value into a PH position of the source data, and send the source data inserted with the parity value to the error correction module;
• the error correction module comprises:
• a second data interleaving module, a decoding module, a determination unit, an error positioning unit, and an output unit;
• the second data interleaving module is configured to perform an interleaving and reorganizing process on the source data sent by the data selector, according to the preset method;
• the decoding module is configured to perform a decoding and restoring process on a parity value in the source data processed by the second data interleaving module;
• the determination unit is configured to calculate a syndrome value of the source data processed by the second data interleaving module, based on the source data inserted with the parity value after the decoding and restoring process, determine whether the source data is wrong based on the syndrome value, and perform an error correction process on the source data if the source data is determined to be wrong;
• the error positioning unit is configured to determine a position of an error character in the source data based on the syndrome value;
• and
• the output unit is configured to output a character block marked with the position of the error character.