Device for controlling memory in digital video disk reproducing device and method therefor

A method for controlling a memory in an optical disk reproducing device, wherein the memory is accessed to read or write data while performing a modulation, an error correction, a deinterleaving, a descrambling and a transferring of the data to audio/video decoders or a ROM decoder with respect to the data read from an optical disk, comprising the steps of:

• designating a unit number to each sector of the memory;
• determining first and second regions of the memory, said first region corresponding to an absolute value of a first unit number obtained by subtracting a unit number Z of a first sector where the descrambling and the data transferring to the audio/video decoders or the ROM decoder are completed from a unit number X of a start sector in an error correction block where the error correction is completed, said second region corresponding to an absolute value of a second unit number obtained by subtracting said unit number Z from a unit number W of a second sector where demodulated data is completely written into a buffer of the memory;
• and
• controlling a W-pointer and a Z-pointer not to overfill a Z-pointer and a Y-pointer, respectively, and controlling an X-pointer not to pass ahead of the W-pointer.

A device for controlling a memory, comprising:

• a demodulator to demodulate data as demodulated data;
• a memory controller to control access to said memory, including storing said demodulated data in said memory in error correction blocks;
• an error correction circuit to correct errors in said error correction blocks, wherein said memory controller stores corrected blocks in said memory;
• a descrambler to receive the corrected blocks from said memory according to control by said memory controller, wherein said memory controller stores said descrambled data in said memory;
• and
• a decoder to decode said descrambled data read out of said memory by said memory controller;
• wherein said memory controller designates a unit number to each sector of said memory, determines a first region of said memory corresponding to a first absolute value of a first difference between a first one of the unit numbers of a first one of the sectors wherein a data read/write is completed of said descrambled data and a second one of the unit numbers of a second one of the sectors which is a start sector of one of the corrected blocks is stored, a second region corresponding to a second absolute value of a second difference between a third unit number of a third one of the sectors wherein the descrambled data is completely transferred to said decoder and said first unit number, and a third region corresponding to a third absolute value between said third unit number and a fourth one of the unit numbers of a fourth one of the sectors wherein a writing operation of the demodulated data is completed, said memory controller controlling a first pointer which points to said fourth unit number and a second pointer which points to said third unit number not to overfill said second pointer and a third pointer which points to said first unit number, respectively, and controlling a fourth pointer which points to said second unit number and said first pointer not to pass ahead of said first and fourth pointers, respectively.

A device for controlling a memory, comprising:

• a demodulator to demodulate data as demodulated data;
• a memory controller to control access to said memory, including storing said demodulated data in said memory in error correction blocks;
• an error correction circuit to correct errors in said error correction blocks, wherein said memory controller stores corrected blocks in said memory;
• a descrambler to receive the corrected blocks from said memory according to control by said memory controller, wherein said memory controller stores said descrambled data in said memory;
• and
• a decoder to automatically decode said descrambled data from said descrambler;
• wherein said memory controller designates a unit number to each sector of said memory, determines a first region of said memory corresponding to a first absolute value of a first difference between a first one of the unit numbers of a first one of the sectors wherein said descrambled data is stored for transfer to said decoder and a second one of the unit numbers of a second one of the sectors which is a start sector of one of the corrected blocks is stored, and a second region corresponding to a second absolute value of a second difference between said first unit number and a third unit number of a third one of the sectors wherein said demodulated data is completely written in said memory, said memory controller controlling a first pointer which points to said third unit number and a second pointer which points to said first unit number not to overfill said second pointer and a third pointer, respectively, and controlling a fourth pointer which points to said second unit number not to pass ahead of said first pointer.