Last written page searching
AssigneeMicron Technology, Inc.
InventorsDheeraj Srinivasan, Ali Mohammadzadeh, Michael G. Miller, Xiaoxiao Zhang, Jung Sheng Hoei
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Abstract
An example method of the present disclosure includes, responsive to a loss of last written page information by a memory system, initiating a last written page search to determine last written page information of a memory device, where the last written page search is initiated via a command from a controller of the memory system to the memory device, responsive to receiving the command, performing the last written page search on the memory device, and providing the last written page information to the controller.
Claims26
A method, comprising:
- responsive to a loss of last written page information by a memory system, initiating a last written page search to determine last written page information of a memory device, wherein the last written page search is initiated via a command from a controller of the memory system to the memory device;
- responsive to receiving the command, performing the last written page search on the memory device;
- and
- providing the last written page information to the controller;
- wherein the last written page information indicates whether memory cells of a last written page are fully programmed.
An apparatus, comprising:
- a system controller;
- a memory device external to the system controller and comprising an internal controller;
- wherein the system controller is configured to send a command to the internal controller responsive to a loss of last written page information;
- wherein the internal controller is configured to:
- perform a last written page search on the memory device to determine last written page information of the memory device responsive to receiving the command;
- and
- provide the determined last written page information to the system controller;
- wherein the last written page information indicates whether memory cells of a last written page are fully programmed.
An apparatus, comprising:
- a system controller comprising a device interface and a host interface;
- a memory device coupled to the system controller by the device interface, the memory device comprising:
- an internal controller;
- and
- a block of memory cells comprising a plurality of sub-blocks, each sub-block comprising physical pages respectively coupled different ones of a plurality of access lines;
- wherein the system controller is configured to send a command to the internal controller responsive to a loss of last written page information;
- wherein the internal controller is configured to:
- responsive to receiving the command, perform an erased page check on at least some of the pages of the block to determine a last written page;
- and
- provide, to the system controller, last written page information that includes an address corresponding to the last written page;
- wherein the last written page information indicates whether the memory cells of the last written page are fully programmed.
Dependencies are inferred from the claim text.