Memory Device SPD Writer for Capacity-Change Signal Verification
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Solution Overview
Problem
Existing memory technologies fail to verify signal integrity (SI) after changing serial presence detect (SPD) data when memory device capacity is altered.
Innovation Solution
A memory system with an SPD writer and test pad to measure voltage signals, ensuring successful data value changes in the SPD device are verified by measuring chip select and bank signals after replacing memory devices with different capacities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SPD data is changed to reflect new memory device capacity, then the SPD data accuracy is improved, but signal integrity verification is lost
Solution Approach 1:
The patent applies preliminary action by measuring the voltage signal of the chip select signal and bank signal immediately after SPD data is changed and before the memory device is fully initialized. This early measurement ensures signal integrity is verified at the critical moment when capacity changes occur, preventing future operational issues while maintaining accurate SPD data updates.
Solution Approach 2:
The patent implements feedback by using the measured voltage signals of chip select and bank signals to verify whether the SPD data change was successful. The measurement results provide feedback information that confirms or rejects the data change, ensuring both accuracy of SPD data and reliability of signal integrity through a closed-loop verification process.
2Adaptability or versatility
If memory device capacity is changed, then the memory system adaptability is improved, but signal integrity of operated signals is not verified
Solution Approach 1:
The patent applies preliminary action by performing voltage signal measurements immediately after capacity changes are made to the memory device. This early verification captures the signal integrity status at the moment of transition, ensuring that adaptability to different capacities is achieved while maintaining reliability through prompt signal validation.
Solution Approach 2:
The patent implements feedback by using the measured voltage signals to verify successful capacity changes and signal integrity. The feedback mechanism confirms that the memory system has properly adapted to the new capacity while maintaining signal integrity, enabling reliable operation across different memory configurations.
3Ease of manufacture
If SPD data change is performed without voltage signal measurement, then the manufacturing process is simplified, but operational reliability is reduced
Solution Approach 1:
The patent applies self-service by having the memory system automatically measure and verify its own voltage signals after SPD data changes. This self-verification mechanism maintains operational reliability without requiring complex external testing equipment or complicated manufacturing processes, achieving a balance between simplicity and reliability through the system's own built-in measurement capabilities.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures immediate verification of signal integrity, confirming successful data value transitions in memory systems, enhancing operational reliability.
Implementation Method 1
a test pad measures a voltage signal generated by a controller
Data Source
AI summary
A system includes a memory module and an SPD writer. The memory module includes a first memory device having a first capacity, and a serial presence detect (SPD) device configured to store data of the memory module. The SPD writer is configured to change the data according to a capacity of the memory module. The SPD writer includes a test pad configured to measure a first voltage signal generated by a controller. After the first memory device is replaced by a second memory device having a second capacity different from the first capacity, the test pad measures the first voltage signal.