A PAINLESS GUIDE TO CRC ERROR DETECTION ALGORITHMS CRC校验理论与实践的经典教程，Ross写的。-A PAINLESS GUIDE TO CRC ERROR DETECTION ALGORITHMS CRC checksum of the classic theory and practice tutorials, Ross wrote.

sec code 电路，用于纠错检错和错误恢复的功能，verilog描述。-sec code circuit, for correction of error detection and error recovery functions, verilog descr iption.