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A technology of external bus interface and memory array, applied in the field of memory, which can solve the problem of slowing down write and read operations
Active Publication Date: 2010-11-17
E·孔法洛涅里 +2
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This reduces the complexity of the remaining system, but these additional storage controller tasks further slow down write and read operations
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[0028] PCM can be adapted to replace flash memory in both embedded and external flash card systems, however, the write speed will not increase significantly without modifying the controller circuitry for the memory array. However, with changes to the controller circuitry and its interaction with the memory bus interface, significant operational improvements can be obtained.
[0029] Phase change memory technology offers many advantages over NAND and NOR (Nor) flash technologies. It's more reliable, has high endurance, and is inherently faster to read and write than NAND. In addition, PCM does not require complex data management algorithms to increase memory reliability or extend its life. This is because the lifetime of PCM cells is much longer than that of flash memory cells. By modifying the task of the controller circuit to the unique advantages of PCM, the overall access time of PCM systems can be improved much more than that of flash memory systems.
[0030] Another im...
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Abstract
A memory controller for a phase change memory (PCM) that can be used on a storage bus interface is described. In one example, the memory controller includes an external bus interface coupled to an external bus to communicate read and write instructions with an external device, a memory array interface coupled to a memory array to perform reads and writes on a memory array, and an overwrite moduleto write a desired value to a desired address of the memory array.
Description
technical field [0001] This application relates to the field of memory. Background technique [0002] Many portable electronic devices, including cameras, phones, game consoles, navigation systems, networking equipment, personal data assistants, digital photo frames, music and video players, and more, use non-volatile memory coupled to processors through standard interfaces. This approach is also suitable for some larger embedded systems, such as home entertainment equipment, appliances, home and office automation and monitoring systems, and controllers for engines, manufacturing methods, etc. Typically, the memory is internal NAND flash, but in other cases the memory is a removable memory card, and in some cases both can be used. [0003] Extensive development efforts have greatly improved the cost, reliability, speed, and density of flash memory, however, writing to flash memory is still slow and complicated compared to most random access memories (RAM). In a typical app...
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