写CRC编解码程序时，整理的文件，压缩文件既有理论说明，也有源代码。源代码格式用C,VHDL,Verilog。-write CRC codec procedures, collating documents, compressed files both theoretical statements, and the active code. Source code format C, VHDL, Verilog.

CRC校验，包括crc8_4、crc12_4、crc16_8、crc32_8-CRC checksum, including crc8_4, crc12_4, crc16_8, crc32_8