Abstract:
Data that is initially stored in Single Level Cell (SLC) blocks is subsequently copied (folded) to a Multi Level Cell (MLC) block where the data is stored in MLC format, the data copied in a minimum unit of a fold-set, the MLC block including a plurality of separately-selectable sets of NAND strings, data of an individual fold-set copied exclusively to two or more word lines of an individual separately-selectable set of NAND strings in the MLC block.
Abstract:
In one embodiment, a memory system is provided comprising a memory die and a controller. The memory die comprises a non-volatile memory, a data latch, and an on-chip randomizer. The controller is configured to send a command to the memory die to cause the on-chip randomizer to store random data in the data latch and send data to the memory die to overwrite some, but not all, of the random data in the data latch, wherein the memory die is configured to transfer the data and random data stored in the data latch to the non-volatile memory. Other embodiments are provided.
Abstract:
A system and method for operating a memory system includes receiving a first user data, writing the first user data to a first buffer, writing the first user data from the first buffer to a first selected memory location, writing the first user data from the first buffer into a second buffer when the first user data was successfully written to the first selected memory location. Data is retrieved from the first selected memory location and written into the first buffer. Data in the first buffer can be matched to the user data in the second buffer to confirm a successful storage of the first user data in the memory system. A previously stored user data can be retrieved from a third selected memory location and written into a third buffer when the previously stored user data was stored in the memory system before the first user data.
Abstract:
In a charge-storage memory array, memory cells that are programmed to a particular threshold voltage range and have subsequently lost charge have their threshold voltages restored by selectively adding charge to the memory cells. Adding charge only to memory cells with high threshold voltage ranges may sufficiently increase threshold voltages of other memory cells so that they do not require separate addition of charge.
Abstract:
Non-volatile memory systems with multi-write direction memory units are disclosed. In one implementation an apparatus comprises a non-volatile memory and a controller in communication with the non-volatile memory. The controller is configured to select an empty memory block of the non-volatile memory for the storage of data; examine an identifier associated with the memory block to determine a write direction for the storage of data; and write data to the memory block beginning with an initial word line of the memory block or a last word line of the memory block dependent on the write direction. The controller is further configured to erase the memory unit and, in response to erasing the memory unit, modify the identifier to change the write direction for a subsequent write of data to the memory block.
Abstract:
Technology is described herein for reclaiming a memory device that has a defective plane. A solution allows a memory device with a defective plane to operate as a single plane device. The memory device with the defective plane may be used without any changes to the memory controller. Thus, the memory controller can send single plane commands to the memory device with the defective plane by using single plane addressing. The memory device may have logic that properly translates the single plane command so that it is compliant with the memory mapping of the multi-plane memory device with the defective plane. Thus, the command will access the correct block in the correct plane.
Abstract:
Apparatus and method for performing a post-write read in a memory device are disclosed. A memory device may include 3-dimensional memory, with the wordlines in a memory block each having multiple strings. Periodically, the memory device may analyze the wordlines for defects by performing a post-write read on a respective wordline and analyzing the read data to determine whether the respective wordline is defective. Rather than reading all of the strings for the respective wordline, less than all of the strings (such as only one of the strings) for the respective wordline are read. In this way, determining whether the respective wordline in 3-dimensional memory may be performed more quickly.
Abstract:
Methods are provided for programming multi-level non-volatile memory cells, the multi-level non-volatile memory cells accessible by a plurality of word lines. The methods include using a four-pass programming technique to program a block of the multi-level non-volatile memory cells, detecting a power cycle before completing programming of the block of the multi-level non-volatile memory cells, and upon power-up initialization, resuming programming on the block of the multi-level non-volatile memory cells.
Abstract:
Methods are provided for programming multi-level non-volatile memory cells, the multi-level non-volatile memory cells accessible by a plurality of word lines. The methods include using a four-pass programming technique to program a block of the multi-level non-volatile memory cells, detecting a power cycle before completing programming of the block of the multi-level non-volatile memory cells, and upon power-up initialization, resuming programming on the block of the multi-level non-volatile memory cells.
Abstract:
A system and method for operating a memory system includes receiving a first user data, writing the first user data to a first buffer, writing the first user data from the first buffer to a first selected memory location, writing the first user data from the first buffer into a second buffer when the first user data was successfully written to the first selected memory location. Data is retrieved from the first selected memory location and written into the first buffer. Data in the first buffer can be matched to the user data in the second buffer to confirm a successful storage of the first user data in the memory system. A previously stored user data can be retrieved from a third selected memory location and written into a third buffer when the previously stored user data was stored in the memory system before the first user data.