摘要:
A non-volatile memory system is organized in physical groups of physical memory locations. Each physical group (metablock) is erasable as a unit and can be used to store a logical group of data. A memory management system allows for update of a logical group of data by allocating a metablock dedicated to recording the update data of the logical group. The update metablock records update data in the order received and has no restriction on whether the recording is in the correct logical order as originally stored (sequential) or not (chaotic). Eventually the update metablock is closed to further recording. One of several processes will take place, but will ultimately end up with a fully filled metablock in the correct order which replaces the original metablock. In the chaotic case, directory data is maintained in the non-volatile memory in a manner that is conducive to frequent updates. The system supports multiple logical groups being updated concurrently.
摘要:
A re-programmable non-volatile memory system, such as a flash EEPROM system, having its memory cells grouped into blocks of cells that are simultaneously erasable is operated in a manner to level out the wear of the individual blocks through repetitive erasing and re-programming. This may be accomplished without use of counts of the number of times the individual blocks experience erase and re-programming but such counts can optionally aid in carrying out the wear leveling process. Individual active physical blocks are chosen to be exchanged with those of an erased block pool in a predefined order.
摘要:
In a nonvolatile memory with block management system that supports update blocks with non-sequential logical units, an index of the logical units in a non-sequential update block is buffered in RAM and stored periodically into the non-volatile memory. In one embodiment, the index is stored in a block dedicated for storing indices. In another embodiment, the index is stored in the update block itself. In yet another embodiment, the index is stored in the header of each logical unit. In another aspect, the logical units written after the last index update but before the next have their indexing information stored in the header of each logical unit. In this way, after a power outage, the location of recently written logical units can be determined without having to perform a scanning during initialization. In yet another aspect, a block is managed as partially sequential and partially non-sequential, directed to more than one logical subgroup.
摘要:
Method for transferring data between a host system and a re-programmable non-volatile mass storage system having memory cells organized into blocks of memory cells is provided. The method includes receiving data via a first interface and/or a second interface; and making data accessible via the first interface and the second interface, even if a file name is not provided by a host system or before a write operation is complete.
摘要:
Method and mass storage memory system is provided. The system includes, re-programmable non-volatile memory cells, the memory cells being arranged in a plurality of blocks that are erasable together; and a controller including a microprocessor that is adapted to receive files of data identified by unique identifiers via a first interface and the controller causes a received data file to be stored in one or more memory blocks; and the controller receives data identified by logical addresses via a second interface and stores the received data in one or more memory blocks, wherein data written via the first interface is indexed using the unique identifiers so that data is accessible via the second interface or the first interface; and data received via the second interface is indexed so that data can be accessed via the first interface or the second interface.
摘要:
A mass storage memory system is provided. The memory system includes, re-programmable non-volatile memory cells arranged in a plurality of blocks of memory cells; and a controller that is adapted to receive data via a first interface, and/or a second interface, and data received via the first interface and the second interface is accessible via the first interface and the second interface even if a file name for the data is not provided by a host system or before a write operation is complete. The first interface is a file based interface and the second interface is a logical interface.
摘要:
The present invention presents a hybrid non-volatile system that uses non-volatile memories based on two or more different non-volatile memory technologies in order to exploit the relative advantages of each these technology with respect to the others. In an exemplary embodiment, the memory system includes a controller and a flash memory, where the controller has a non-volatile RAM based on an alternate technology such as FeRAM. The flash memory is used for the storage of user data and the non-volatile RAM in the controller is used for system control data used by the control to manage the storage of host data in the flash memory. The use of an alternate non-volatile memory technology in the controller allows for a non-volatile copy of the most recent control data to be accessed more quickly as it can be updated on a bit by bit basis. In another exemplary embodiment, the alternate non-volatile memory is used as a cache where data can safely be staged prior to its being written to the to the memory or read back to the host.
摘要:
Host system data files are written directly to a large erase block flash memory system with a unique identification of each file and offsets of data within the file but without the use of any intermediate logical addresses or a virtual address space for the memory. Directory information of where the files are stored in the memory is maintained within the memory system by its controller, rather than by the host. The file based interface between the host and memory systems allows the memory system controller to utilize the data storage blocks within the memory with increased efficiency.
摘要:
Host system data files are written directly to a large erase block flash memory system with a unique identification of each file and offsets of data within the file but without the use of any intermediate logical addresses or a virtual address space for the memory. Directory information of where the files are stored in the memory is maintained within the memory system by its controller, rather than by the host. The file based interface between the host and memory systems allows the memory system controller to utilize the data storage blocks within the memory with increased efficiency.
摘要:
Techniques for managing data in a non-volatile memory system (e.g., Flash Memory) are disclosed. A controller can use information relating to a host's filing system, which is stored by the host on non-volatile memory, to determine if one or more clusters (or sectors with clusters) are currently allocated. The controller can use the information relating to the host's filing system to ensure that one or more clusters (or one or more sectors within a cluster) are not copied from one location to another location in the memory during a garbage collection cycle. As a result, some unnecessary operations (e.g., copying data) which are conventionally performed can be avoided and system performance can be enhanced.