Flash Memory Cache Line Size Optimization

The flash memory is divided into multiple independent memory arrays (first memory array and second memory array). Each array can be erased and written independently, allowing parallel processing of write operations. This segmentation enables the system to bypass the limitation of erasing entire large blocks by distributing write operations across multiple smaller arrays, thereby improving write speed without increasing cell disturbance in any single array.

The patent introduces a multi-dimensional memory architecture with multiple memory arrays organized in a two-dimensional structure. This allows the system to perform write operations in parallel across different arrays, effectively adding a spatial dimension to the write process. By utilizing multiple arrays simultaneously, the system achieves higher throughput without requiring larger erase blocks, thus resolving the contradiction between write speed and cell disturbance.

Multiple memory arrays are merged into a unified memory system with a single namespace. The memory control device manages all arrays transparently, presenting them as a single logical memory unit to the host system. This merging approach allows parallel operation of multiple arrays for improved throughput while hiding the complexity of multi-array management from the host, thus achieving high productivity without proportionally increasing device complexity.

Each memory array is designed with identical structure and functionality, allowing any array to serve any purpose. This universality enables flexible allocation and parallel processing while simplifying the control logic, as the same management techniques apply to all arrays. The multi-functional design allows the system to achieve high transfer speeds through parallel operations without requiring complex specialized handling for each array.

The cache memory is organized with line sizes that are smaller than the flash memory page size. Each cache line corresponds to a portion of a flash page, allowing the cache to store multiple cache lines within the capacity of a single flash page. This segmentation enables the cache to achieve high hit rates for partial page accesses while requiring less total cache capacity, as not all cache lines need to be loaded simultaneously.

The patent changes the cache memory parameters by using line sizes that are smaller than the flash memory page size. This parameter change allows the cache to operate more efficiently with smaller capacity, as it can service requests for individual cache lines without requiring entire pages to be cached. The altered cache parameters enable high hit rates while reducing the quantity of cache memory needed.