Memory System Test and Repair Circuit for SIP Reliability
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Solution Overview
Problem
In memory systems with a System In Package (SIP) structure, detecting and rapidly recovering from defective or failed memory parts is crucial for maintaining reliability, as replacing the entire SIP chip is often necessary, which complicates efficient fault management and data bandwidth adjustment.
Innovation Solution
A memory system comprising a first memory and a second memory, both connected to a test and repair circuit that performs tests and repairs based on initiation signals generated by a memory controller, allowing for simultaneous data writing and reading, and error correction threshold monitoring to identify and address faulty components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a defective or failed part occurs in the memory devices of the SIP structure, then the entire SIP chip must be replaced, but this increases system complexity and reduces reliability improvement efficiency
Solution Approach 1:
The patent divides the memory system into multiple independently manageable memory devices (first memory device, second memory device) within the SIP structure. Each memory device can be individually tested and repaired through the test and repair circuit, allowing selective replacement rather than replacing the entire SIP chip. This segmentation enables granular fault management and improves reliability without increasing overall system complexity.
Solution Approach 2:
The patent implements a self-test and self-repair mechanism where the memory system automatically detects defective parts through the test and repair circuit and performs repair operations by switching to redundant memory devices. This self-service capability eliminates the need for manual intervention or complex external fault management systems, reducing device complexity while improving reliability.
2Reliability
If the entire SIP chip is replaced when a defective part occurs, then reliability is maintained, but system downtime increases
Solution Approach 1:
The patent pre-configures redundant memory devices (second memory device as standby for first memory device, and vice versa) that are ready to immediately take over when a defect is detected. The test and repair circuit continuously monitors memory health and can switch to redundant devices without interrupting system operation. This preliminary preparation of backup resources eliminates system downtime while maintaining reliability.
Solution Approach 2:
The patent implements a dynamic switching mechanism where defective memory devices are discarded (taken out of service) and replaced by recovering the functionality through redundant memory devices. The test and repair circuit identifies failed components and redirects operations to healthy redundant devices, allowing the system to continue operating without interruption while the defective device is replaced. This approach maintains reliability while minimizing system downtime.
3Reliability
If continuous monitoring and testing of memory devices is performed, then defective parts are detected rapidly, but data bandwidth is reduced
Solution Approach 1:
The patent implements periodic testing rather than continuous monitoring, where the test and repair circuit performs defect detection at scheduled intervals or under specific conditions (such as during idle periods or when error thresholds are exceeded). This periodic action allows the system to maintain high data bandwidth during normal operations while still achieving rapid defect detection when tests are performed, resolving the contradiction between monitoring frequency and data throughput.
Data Source
AI summary
A memory system and a method for operating the same, wherein the memory system includes a first memory and a second memory each configured to store data. The memory system further includes a test and repair circuit operationally connected to the first memory and to the second memory. The test and repair circuit is configured to receive a test initiation signal and perform, in response to receiving the test initiation signal, a test operation on at least one of the first memory and the second memory. The test and repair circuit is also configured to perform, based on a result of the test operation, a repair operation on the at least one of the first memory and the second memory.