US 12,602,102 B2Granted

Selective backup to persistent memory for volatile memory

AssigneeSMART Modular Technologies, Inc.

InventorAndrew Mills

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Abstract

Systems and methods for selective backup to persistent memory from volatile memory are disclosed. In one aspect, a memory controller includes a detection circuit that detects an address for a memory access and determines a range into which that address falls. The memory controller also includes a touched map that is configured to store an indication as to what areas (or ranges) of memory have been accessed, as determined by the detection circuit. In the event of a command or power interruption, a backup routine initially consults the touched map and only backs up those ranges which have been touched. Such selective backup may reduce the amount of time and power required to make a backup, reducing the demands placed on a backup energy source.

Claims14

Dependent claims

A memory device comprising:

a communication interface configured to couple to a bus and allow communication with a host controller therethrough, wherein the communication interface comprises a compute express link (CXL) interface and the communication is compliant with the CXL protocol;
a volatile random-access memory (RAM) portion;
a persistent memory portion;
a touch map circuit configured to store information related to addresses detected by a detection circuit;
and
a backup memory controller configured to:
detect a backup event;
and
copy data from the volatile RAM portion to the persistent memory portion based on the information in the touch map circuit;
receive a memory restore command from a host memory controller;
and
responsive to receiving the memory restore command, determine when the portions of the volatile memory indicated in the touch map circuit exceed a threshold, and responsive to the threshold being exceeded, restore all the volatile memory portion.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/231,470Filed 8 Aug 2023
Published: US 2025/0053219 A113 Feb 2025
Granted: 14 Apr 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

G06F 1/305
Means for acting in the event of power-supply failure or interruption, e.g. power-supply fluctuations: in the event of power-supply fluctuations
G06F 1/3275
Power saving in peripheral device: power saving in memory, e.g. RAM, cache
G06F 11/1441
At system level: resetting or repowering
G06F 11/1448
Point-in-time backing up or restoration of persistent data: management of the data involved in backup or backup restore

Family

US 2025/0053219 A1Pre-grant publication · published 13 Feb 2025
US 12,602,102 B2This patent

From the US filing history. Foreign family members aren’t listed.

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