Hash filter-based selective-row refresh in memory device

A method, comprising:

• obtaining, by a memory controller from a host device through a first channel, a hash filter indicating a first subset of rows in a memory array, wherein the hash filter indicates rows of the memory array storing valid data as the first subset of rows;
• receiving, by the memory controller from the host device through the first channel, an indication to enter self-refresh mode, wherein the host device enters a sleep mode after the hash filter is obtained and the indication to enter the self-refresh mode is received;
• and
• refreshing, by the memory controller after receiving the indication, only the first subset of rows in the memory array based on the hash filter and according to the self-refresh mode.

An apparatus, comprising:

• at least one processor;
• and
• a memory controller coupled to the at least one processor and to a memory system through a channel and configured to communicate with the memory system through the channel,
• wherein the at least one processor is configured to perform operations including:
• saving data to a first subset of rows in a memory array of the memory system through the memory controller;
• determining a hash filter corresponding to the first subset of rows, wherein the hash filter indicates rows of the memory array storing valid data as the first subset of rows;
• receiving an indication to enter a sleep mode, wherein saving the data is performed after receiving the indication to enter the sleep mode;
• transmitting, by the at least one processor, an indication to enter self-refresh mode to the memory system through the memory controller after receiving the indication to enter the sleep mode;
• copying, through the memory controller, the hash filter to the memory system;
• and
• entering the sleep mode after copying the hash filter to the memory system.

A method, comprising:

• saving, by at least one processor of a host device coupled to a memory system through a channel by a memory controller, data to a first subset of rows in a memory array of the memory system through the memory controller;
• determining, by the at least one processor, a hash filter corresponding to the first subset of rows, wherein the hash filter indicates rows of the memory array storing valid data as the first subset of rows;
• receiving an indication to enter a sleep mode, wherein saving the data is performed after receiving the indication to enter the sleep mode;
• transmitting, by the at least one processor, an indication to enter self-refresh mode to the memory system through the memory controller after receiving the indication to enter the sleep mode;
• copying, by the at least one processor through the memory controller, the hash filter to the memory system;
• and
• entering the sleep mode after copying the hash filter to the memory system.