Storage controller, memory management method and storage device

A memory management method for a storage controller, comprising:

• identifying a current power mode of the host system, wherein the power mode comprises a plurality of corresponding power consumption levels from large to small, and the power modes of different power consumption levels correspond to different host speeds;
• obtaining a target command from a command queue;
• in response to determining that the target command is configured to enable a write booster mode, determining whether the power mode is a highest level;
• in response to determining that the power mode is the highest level, determining whether a cache block currently in use belongs to a triple-level cell type;
• in response to determining that the cache block currently in use belongs to the triple-level cell type, freezing the cache block of the triple-level cell type;
• using a physical block of a single-level cell type as a new cache block to write cache data into the new cache block;
• and
• enabling the write booster mode and send an enabling completed response;
• wherein in response to determining that the target command is not configured to enable the write booster mode, the target command is executed;
• in response to determining that the current power mode is not the highest level, the write booster mode is enabled, and the enabling completed response is sent;
• in response to determining that the cache block currently in use does not belong to the physical block of the triple-level cell type, the write booster mode is enabled, and the enabling completed response is sent.

A storage device, comprising:

• a connection interface circuit, configured to electrically connect to the host system;
• a rewritable non-volatile memory module, wherein the rewritable non-volatile memory module comprises a plurality of memory dies, each of the memory dies has a plurality of physical blocks, and each of the physical blocks has a plurality of physical pages;
• and
• a storage controller, electrically connected to the connection interface circuit and the rewritable non-volatile memory module,
• wherein the storage controller is configured to:
• identify a current power mode of a host system, wherein the power mode comprises a plurality of corresponding power consumption levels from large to small, and the power modes of different power consumption levels correspond to different host speeds;
• obtain a target command from a command queue;
• in response to determining that the target command is configured to enable a write booster mode, determine whether the power mode is a highest level;
• in response to determining that the power mode is the highest level, determine whether a cache block currently in use belongs to a triple-level cell type;
• in response to determining that the cache block currently in use belongs to the triple-level cell type, freeze the cache block of the triple-level cell type;
• use a physical block of a single-level cell type as a new cache block to write cache data into the new cache block;
• and
• enable the write booster mode and send an enabling completed response,
• wherein in response to determining that the target command is not configured to enable the write booster mode, execute the target command;
• in response to determining that the current power mode is not the highest level, enable the write booster mode, and send the enabling completed response;
• in response to determining that the cache block currently in use does not belong to the physical block of the triple-level cell type, enable the write booster mode, and send the enabling completed response.