Post Package Repair Buffer for Memory Controller
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Solution Overview
Problem
Existing memory devices face challenges in efficiently performing post-package repair (PPR) due to limited resources and time-consuming standard PPR flows, which can lead to increased downtime and reduced component reuse.
Innovation Solution
Integration of Post Package Repair (PPR) hardware, including buffers or caches, within the controller of a memory device to simplify and accelerate the repair process by providing additional spare resources without increasing the PPR resources from the memory media.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If standard post package repair flow is used, then repair process is simple, but repair time is long and productivity is reduced
Solution Approach 1:
The patent implements preliminary action by pre-loading replacement rows into a buffer/cache structure before actual repair operations are needed. The buffer is initialized with replacement data during system operation, so when a repair event occurs, the replacement rows are already prepared and immediately available, eliminating the need for time-consuming real-time data fetching and reducing repair downtime.
Solution Approach 2:
The patent introduces an intermediary buffer/cache structure between the memory device and the repair process. This buffer acts as a mediator that stores pre-fetched replacement rows, allowing the repair process to access replacement data without directly querying the external memory subsystem. The buffer intermediary significantly reduces repair latency and improves productivity while maintaining operational simplicity.
2Reliability
If additional PPR resources are added to memory media, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent extracts the PPR resource functionality from the memory media itself and relocates it to a separate buffer/cache structure within the controller. By taking out the PPR resource addition requirement from the memory media, the system can enhance reliability through additional repair resources without increasing the complexity of the memory media structure. The buffer handles the PPR resource management independently.
Solution Approach 2:
The buffer/cache structure serves multiple functions: it stores replacement rows for repair operations, manages PPR resource allocation, and provides fast access during repair events. This multi-functional design allows the system to improve reliability through enhanced PPR capabilities without adding complex structures to the memory media, as the buffer handles all PPR-related operations universally.
3Device complexity
If standard PPR resources are used, then device complexity is low, but component reuse is limited and reliability is reduced
Solution Approach 1:
The buffer is pre-loaded with replacement rows during normal system operation, performing preliminary action before repair events occur. This allows the system to maintain low device complexity by using a simple buffer structure while enabling enhanced component reuse and reliability through pre-prepared replacement resources that can be immediately deployed when needed.
Solution Approach 2:
The patent implements copying by creating copies of replacement rows in the buffer/cache structure. Instead of directly manipulating the original memory media, the buffer stores copies of replacement data, allowing multiple components to be reused and repaired without increasing controller complexity. The copying mechanism enables reliable component reuse while maintaining a simple overall system architecture.
Data Source
AI summary
A variety of applications can include a memory device implementing one or more caches or buffers integrated with a controller of the memory device to provide post package repair resources. The one or more caches or buffers can be separate from the media subsystem that stores user data for the memory device. Arrangements of the one or more caches or buffers can include the one or more caches or buffers structured between decoder-encoder arrangements of the memory device and the media subsystem of the memory device. Other arrangements of the one or more caches or buffers can include decoder-encoder arrangements of the memory device structured between the one or more caches or buffers and the media subsystem of the memory device. Combinations of arrangements may be implemented. Additional apparatus, systems, and methods are disclosed.