Flash memory controller
A flash memory controller for controlling a flash memory module includes a communication interface for receiving a first data and a second data; and a processing circuit for dynamically controlling a data writing mode of the flash memory module according to an amount of stored data in the flash memory module. If the amount of stored data in the flash memory module is less than a first threshold when the communication interface receives the first data, the processing circuit controls the flash memory module so that the first data is written into the first data block under an one-bit-per-cell mode.
1. A method for controlling a flash memory module, wherein the flash memory module comprises a plurality of blocks, and the method comprising:
receiving data from a host device; and
determining if the data is cold data;
if it is determined that the data is the cold data, using at least four of program threshold voltage intervals to write the data into one of the blocks;
if it is determined that the data is not the cold data, referring to an amount of stored data in the flash memory module to select at least a portion of the program threshold voltage intervals to write the data into the one of the blocks.
2. The method of claim 1 , wherein the plurality of data blocks are realized by triple-level cells (TLCs), and the blocks supports eight plurality of program threshold voltage intervals.
3. The method of claim 1 , wherein the step of determining if the data is the cold data comprises:
determining if the data is the cold data according to a file type, a file extension, or a logical address of the data.
4. The method of claim 1 , wherein the step of referring to the amount of the stored data in the flash memory module to select at least a portion of the program threshold voltage intervals to write the data into the one of the blocks comprises:
if the amount of stored data in the flash memory module is less than a first threshold, using only two of the program threshold voltage intervals to write the data into one of the blocks; and
if the amount of stored data in the flash memory module is greater than the first threshold, using at least four of the program threshold voltage intervals to write the data into the one of the blocks.
5. The method of claim 4 , wherein the step of using only two of the program threshold voltage intervals to write the data into one of the blocks comprises:
if the amount of stored data in the flash memory module is less than the first threshold, using only the lowest two of program threshold voltage intervals to write the data into the one of the blocks.
6. The method of claim 4 , wherein the step of using at least four of the program threshold voltage intervals to write the data into the one of the blocks comprises:
if the amount of stored data in the flash memory module is greater than the first threshold, using only the lowest four of the program threshold voltage intervals to write the data into the one of the blocks.
7. A method for controlling a flash memory module, wherein the flash memory module comprises a plurality of blocks, and the method comprising:
receiving data from a host device; and
determining if the data is hot data;
if it is determined that the data is the hot data, using only two of program threshold voltage intervals to write the data into one of the blocks;
if it is determined that the data is not the hot data, referring to an amount of stored data in the flash memory module to select at least a portion of the program threshold voltage intervals to write the data into the one of the blocks.
8. The method of claim 7 , wherein the plurality of data blocks are realized by triple-level cells (TLCs), and the blocks supports eight plurality of program threshold voltage intervals.
9. The method of claim 7 , wherein the step of determining if the data is the hot data comprises:
determining if the data is the hot data according to a file type, a file extension, or a logical address of the data.
10. The method of claim 7 , wherein the step of referring to the amount of the stored data in the flash memory module to select at least a portion of the program threshold voltage intervals to write the data into the one of the blocks comprises:
if the amount of stored data in the flash memory module is less than a first threshold, using only two of the program threshold voltage intervals to write the data into one of the blocks; and
if the amount of stored data in the flash memory module is greater than the first threshold, using at least four of the program threshold voltage intervals to write the data into the one of the blocks.
11. The method of claim 10 , wherein the step of using only two of the program threshold voltage intervals to write the data into one of the blocks comprises:
if the amount of stored data in the flash memory module is less than the first threshold, using only the lowest two of program threshold voltage intervals to write the data into the one of the blocks.
12. The method of claim 10 , wherein the step of using at least four of the program threshold voltage intervals to write the data into the one of the blocks comprises:
if the amount of stored data in the flash memory module is greater than the first threshold, using only the lowest four of the program threshold voltage intervals to write the data into the one of the blocks.