Silicon Motion, Inc.

Ting-Han Lin

Che-Wei Hsu

Mapping information management for data storage devices is provided. A controller caches write data issued by a host in a temporary storage and then programs the cached write data from the temporary storage to a non-volatile memory. The controller uses a mapping information format to manage mapping information of logical addresses recognized by the host. As presented in the mapping information format, the values not greater than a first threshold value and mapped to the configuration information storage space of the non-volatile memory are at least partially used to point to the temporary storage, and the values greater than the first threshold value are mapped to the non-volatile memory.

Data storage device and non-volatile memory control method

Mapping information management for data storage. A mapping information format without any uncorrectable flag bits (UNC bits) is shown. A controller provides a cyclic redundancy check (CRC) engine. In response to an uncorrectable marking command issued by a host, the controller operates the cyclic redundancy check engine to encode a data pattern with a biased encoding seed to generate biased cyclic redundancy check code. The controller programs the data pattern and the biased cyclic redundancy check code to the non-volatile memory. The data pattern, therefore, will not pass CRC. The uncorrectable marking command works.

High-efficiency control technology for non-volatile memory is shown. A controller allocates spare blocks of a non-volatile memory to provide a first active block and writes data issued by a host to the first active block. When the number of spare blocks is less than a threshold number and valid data of a first source block is less than a critical data amount, the controller uses the first active block as a data transfer destination for the valid data from the first source block.

Data storage device and control method for non-volatile memory

High-efficiency control technology for non-volatile memory is shown. A controller transfers valid data from a first source block to an active block in sections and, between segmented data transfers, the controller writes data issued by the host to the active block. When no second source block is waiting, the controller transfers a first amount of valid data from the first source block to the active block in each segmented data transfer. When a second source block is waiting, the controller transfers a second amount of valid data from the first source block to the active block in each segmented data transfer. The second amount is larger than the first amount and thereby the data transfer for the first source block speeds up.

Data storage device and control method for non-volatile memory with high-efficiency garbage collection

High-efficiency control technology for non-volatile memory. A controller allocates spare blocks of a non-volatile memory to provide an active block and writes data issued by a host to the active block. The controller further uses the active block as the destination for data transferred from a first source block when there are fewer spare blocks than the threshold amount. When a second source block meets the transfer requirements, the controller uses the active block as the destination for data transferred from the second source block.

Growing community of inventors

Zhubei, Taiwan

Ting-Han Lin