US 12,217,824 B2 · Finite time counting period counting of infinite data streams

Abstract

Systems and methods for finite time counting period counting of infinite data streams is presented. In particular example systems and methods enable counting row accesses to a memory media device over predetermined time intervals in order to deterministically detect row hammer attacks on the memory media device. Example embodiments use two identical tables that are reset at times offset in relation to each other in a ping-pong manner in order to ensure that there exists no false negative detections. The counting techniques described in this disclosure can be used in various types of row hammer mitigation techniques and can be implemented in content addressable memory or another type of memory. The mitigation may be implemented on a per-bank basis, per-channel basis or per-memory media device basis. The memory media device may be a dynamic random access memory type device.

Claims20

Dependent claims

An apparatus, comprising:

two tables stored in memory, each table configured to store an identical number of counters;
circuitry configured to:
receive consecutive periodic signals of a first type at a regular fixed interval during a monitoring duration;
reset one, but not the other, of the two tables in response to each of a first signal of the consecutive periodic signals and every alternate signal of the consecutive periodic signals occurring after the first signal, and reset the other, but not the one, of the two tables in response to a second signal of the consecutive periodic signals and every alternate signal of the consecutive periodic signals occurring after the second signal, wherein the first signal and the second signal are consecutive signals;
increment a corresponding counter in each of the two tables in response to each second type of signal received during the monitoring duration;
generate a third type of signal when any one of the counters exceeds a predetermined threshold during the monitoring duration.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application

18/160,292Filed 26 Jan 2023 · us provisional application

Priority

27 Jan 2022

Published

US 2023/0282258 A17 Sep 2023

Granted

4 Feb 2025

Term ends

Not estimatedThe source records don’t support an estimate.

Classification10 codes

G11C 7/24
Arrangements for writing information into, or reading information out from, a digital store: memory cell safety or protection circuits, e.g.…
G11C 7/222
Read-write [R-W] timing or clocking circuits; Read-write [R-W] control signal generators or management: clock generating, synchronizing or…
G11C 11/4078
For memory cells of the field-effect type: safety or protection circuits, e.g. for preventing inadvertent or unauthorised reading or writing;…
G11C 29/52
Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation: protection of memory contents;…

Finite time counting period counting of infinite data streams

Life of this patent

Finite time counting period counting of infinite data streams

Life of this patent

Abstract

Claims20