摘要:
According to a first aspect of the invention, there is provided a controller connected to a non-volatile memory and including a volatile memory, wherein the controller maintains lists in volatile memory of blocks in the non-volatile memory allocated for storage of logical sector data and of blocks recently erased in the non-volatile memory.
摘要:
A dual media storage device is provided. Two separate non-volatile mass storage devices, one having a faster access time and a lower capacity than the other, are combined into a single system. A storage controller can direct the flow of data into one device or the other, depending upon various conditions, which might include one mass storage device being unavailable or for certain caching schemes.
摘要:
A multi-layer memory and method for operation is disclosed. The memory includes multiple layers, where each layer includes flash memory cells having a greater bit per cell capacity than then prior layer and each layer may include a plurality of partitions having blocks exclusively associated with a particular data type. The method may include the steps of directing host data directly into a particular partition of a particular layer of the multi-layer memory upon receipt depending on a type of the data. The method may also include copying data within the same partition in a respective layer in a data relocation operation to generate more free blocks of memory so that data preferably stays within each layer and in the same partition, as well as transferring data from one layer to the next higher bit per cell layer within a same partition when layer transfer criteria are met.
摘要:
A multi-layer memory and method for operation is disclosed. The memory includes an interface, at least one flash memory die having a plurality of layers and a controller. The controller is configured to select an appropriate one of a predetermined number of program cycles for programming a fixed amount of host data, and for carrying out maintenance operations in one or more of the layers sufficient to permit a next host data write operation. The controller calculates an interleave ratio of maintenance operations to host data programming operations in each of the layers used in the determined programming cycle so that creation of free space is interspersed with host data writes in a steady manner during execution of the determined programming cycle.
摘要:
A system and method for managing program cycles in a multi-layer memory is disclosed. The method includes a controller receiving a request to program data from a host and, in advance of programming data associated with the request, determining a program cycle for programming the data associated with the request and an amount of data already programmed in the plurality of memory layers necessary to be programmed in maintenance operations to provide free memory capacity for a subsequent request to program data from the host. The controller programs the data associated with the request, and the amount of data already programmed to be programmed in maintenance operations, in predetermined programming units according to the determined program cycle.
摘要:
A method and system for storage address re-mapping in a multi-bank memory is disclosed. The method includes allocating logical addresses in blocks of clusters and re-mapping logical addresses into storage address space, where short runs of host data dispersed in logical address space are mapped in a contiguous manner into megablocks in storage address space. Independently in each bank, valid data is flushed within each respective bank from blocks having both valid and obsolete data to make new blocks available for receiving data in each bank of the multi-bank memory when an available number of new blocks falls below a desired threshold within a particular bank.
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 file 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 file system to identify when the host is sending data to the next free cluster and to store such data in a sequential format by copying data from other locations in the non-volatile memory.
摘要:
Methods and apparatus for writing data to non-volatile memory include maintaining one or more lists of obsolete blocks of the non-volatile memory and limiting the lists to a predetermined value. If a write operation would result in a list exceeding its predetermined value, a block erase operation is performed on one of the obsolete blocks. Valid data contained in an obsolete block selected for erasure is relocated prior to erasure.
摘要:
A hybrid non-volatile system uses non-volatile memories based on two or more different non-volatile memory technologies in order to exploit their relative advantages. 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. 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 memory or read back to the host.
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.