Memory control method, memory storage device and memory control circuit unit

Abstract

The invention provides a memory control method, a memory storage device and a memory control circuit unit. The memory control method is used for the memory storage device. The method comprises the steps of reading first data from a first physical unit in response to a first reading instruction from a host system; performing a first decoding operation on the first data to obtain decoded data corresponding to the first data; storing decoded data corresponding to the first data to a buffer memory; reading second data from the first physical unit in response to a second read instruction from a host system; performing a second decoding operation on the second data; and in response to failure of the second decoding operation, searching for decoded data corresponding to the first data from the buffer memory in place of reading of the second data. Therefore, the data reading speed can be increased as much as possible while data decoding requirements are met.

Description

technical field [0001] The invention relates to a memory control technology, in particular to a memory control method, a memory storage device and a memory control circuit unit. Background technique [0002] Digital cameras, mobile phones, and MP3 players have grown rapidly in recent years, making consumers' demand for storage media also increase rapidly. Since the rewritable non-volatile memory module (for example, flash memory) has the characteristics of data non-volatility, power saving, small size, and no mechanical structure, it is very suitable for built-in Among the various portable multimedia devices listed above. [0003] Generally speaking, the data read from the rewritable non-volatile memory module may have errors. This error can be corrected by error checking circuitry. However, if error correction is performed on the read data every time the data is read, the overall read performance of the memory storage device will be degraded. In particular, for memory s...

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Problems solved by technology

However, the problem with this mechanism is that if the data to be read does not exist in the buffer memory and / or the data read does not have errors (or only has a small number of errors), then every time the data is read, the Searching the buffer memory first will actually take extra reading time, and may even need to read data from the rewritable non-volatile memory module to decode after spending extra time searching the buffer memory, but it will cost more time to read data

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