CD-ROM decoder

A CD-ROM decoder for temporarily storing in a buffer memory in sector units digital data having a predetermined number of bytes and a predetermined format, processing the digital data by correcting and detecting code errors included in the digital data, and transferring the processed digital data, wherein the digital data includes header information related with a mode of a sector and sub-header information related with a form of the sector, the sub-header information including a first code and a second code following the first code, the CD-ROM decoder comprising:

• an error flag register for receiving an error flag when an error in the digital data was not corrected during the code error correction process;
• a header information register for storing the header information and the sub-header information;
• and
• a sector information conversion circuit connected to the error flag register and the header information register for deciding the format of the digital data in each sector based on the error flag, the header information, and the sub-header information and generating sector information indicating the decided format, the sector information conversion circuit temporarily storing the sector information and the digital data in the buffer memory, wherein the sector information conversion circuit decides the mode of the sector of the digital data based on the header information and compares the first code and the second code to decide the form of the sector of the digital data.