Multi-Pass NAND RAID Parity Buffering Optimization

The patent segments the parity data buffering process into multiple passes, where parity data is generated and buffered incrementally for each pass rather than waiting for all passes to complete. This divides the large memory requirement into smaller, manageable segments that can be handled in stages.

The patent performs preliminary encoding of user data to generate parity data before the actual programming passes are completed. By preparing parity data in advance for each pass, the system reduces the peak memory buffer requirement while ensuring reliability through pre-computed redundancy.

The patent implements a dynamic memory management strategy where the buffer size and memory allocation are adjusted based on the current pass being executed. Rather than statically allocating large memory spaces or copying data between memory types, the system dynamically allocates only the necessary buffer space for the current pass operations.

The patent eliminates the need for copying parity data between rapid and slow memory by generating and buffering parity data directly in the appropriate memory space for each pass. This avoids the performance penalty of data copying while still resolving memory space constraints through pass-by-pass processing.

The patent segments the data transmission process into multiple passes, where only the necessary portion of page data is transmitted and buffered for each individual pass. This segmentation reduces the peak buffer memory demand compared to buffering all data simultaneously, while ensuring complete programming through multiple sequential passes.

The patent employs periodic action by repeating the encoding and transmission process for each pass. Parity data is generated, buffered, and transmitted in periodic cycles corresponding to each pass, allowing the system to complete full programming while managing buffer demands through rhythmic, controlled data flow.