Memory Bank tRASmax Enforcement for Data Loss Prevention
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Solution Overview
Problem
Current memory technologies face issues such as data loss, memory degradation, and potential damage due to extended activation times of memory banks without timely precharge commands, which can be exacerbated by malicious attacks.
Innovation Solution
Implementing a system within the memory device to enforce a maximum row active time (tRASmax) by internally issuing a precharge command if the host device fails to do so within the specified time, using tRAS enforcement circuits to monitor and manage memory bank activation times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the memory bank is activated for extended period of time to allow data access operations, then the data storage capability is improved, but data loss occurs due to insufficient refresh and memory device life is reduced
Solution Approach 1:
The patent implements a maximum row active time (tRASmax) enforcement mechanism that proactively monitors and limits the activation duration of memory banks. Before data loss can occur due to excessive activation time, the system enforces a predetermined time limit, thereby preventing the harmful effect rather than reacting to it after damage occurs.
Solution Approach 2:
The patent employs a feedback mechanism where the memory device monitors the activation time of memory banks and provides control signals to the host device when the maximum row active time is exceeded. This feedback loop enables real-time adjustment of memory bank activation duration to prevent data loss while maintaining optimal data access capability.
2Productivity
If the memory bank is kept open for extended period of time to improve access speed, then the productivity is improved, but memory degradation and permanent damage occur
Solution Approach 1:
The system establishes a maximum row active time threshold before memory degradation occurs. By proactively enforcing this time limit through tRASmax enforcement, the system prevents cumulative damage to memory cells while still allowing sufficiently fast data access operations to maintain productivity.
Solution Approach 2:
The patent dynamically controls the activation time parameter of memory banks by enforcing a maximum threshold. This parameter change strategy balances the need for fast data access (productivity) with the need to prevent excessive activation time that would cause memory degradation and reliability issues.
3Ease of operation
If the host device fails to issue precharge command timely to close memory bank, then the data access operations can continue, but malicious attacks can damage memory cells permanently
Solution Approach 1:
The patent implements a protective mechanism that preemptively counteracts potential malicious attacks by enforcing maximum row active time limits. Even if the host device fails to issue precharge commands intentionally or unintentionally, the tRASmax enforcement mechanism ensures that memory banks cannot remain activated long enough to suffer permanent damage from attacks, while still allowing legitimate data access operations to complete.
Data Source
AI summary
A system for providing maximum row active time enforcement for memory devices is disclosed. A host device issues an activate command to activate a memory bank of a plurality of memory banks of a memory. The memory device activates the memory bank and determines whether a precharge command to close the first memory bank has been issued by the host device within a maximum threshold amount of time since issuance of the activate command. If the system determines that the precharge command has been issued by the host device within the threshold, the memory device closes the memory bank via the host-issued precharge command. If, however, the system determines that the precharge command has not been issued by the host device within the threshold, the memory device internally issues a precharge command to close the memory bank to reduce potential data loss and other harmful effects to the memory device.