Strobe Signal Timing Adjustment in Semiconductor Test Mode
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Solution Overview
Problem
Semiconductor memory devices face challenges in preventing errors during read and write operations due to synchronization issues with strobe signals, requiring a test mode to adjust data and strobe signal generation moments.
Innovation Solution
A semiconductor system comprising a first and second semiconductor device, where the first device outputs a chip selection signal, command/address signals, and a clock signal, and adjusts the output moment of the strobe signal during a test mode, while the second device synchronizes with the strobe signal to latch input data and generate output data, enabling efficient data transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a test mode is implemented to adjust data and strobe signal generation moments, then synchronization accuracy is improved, but execution time increases
Solution Approach 1:
The patent applies preliminary action by performing synchronization adjustment before the actual read/write operations. The test mode adjusts the generation moments of data and strobe signals in advance, ensuring that when normal operations resume, the timing is already optimized, thereby reducing the need for repeated adjustments and minimizing overall execution time.
Solution Approach 2:
The patent utilizes parameter changes by modifying the generation moments of the strobe signal and data signals during test mode. By dynamically adjusting these timing parameters, the system achieves optimal synchronization without requiring extensive trial-and-error testing, thus reducing the time loss associated with repeated adjustments.
2Reliability
If test mode is used to control generation moments of data and strobe signal, then error prevention is improved, but operational complexity increases
Solution Approach 1:
The patent merges the test mode functionality with the normal operation mode by integrating the synchronization adjustment mechanism into the existing signal generation circuitry. This consolidation allows the same hardware to perform both testing and normal operations without requiring separate dedicated test equipment, thereby reducing operational complexity while maintaining error prevention capabilities.
Solution Approach 2:
The system performs self-service by automatically adjusting the generation moments of data and strobe signals based on internal timing requirements. The test mode enables the system to self-synchronize without external intervention, reducing the complexity of manual timing adjustments and making the system more autonomous in preventing synchronization-related errors.
3Productivity
If direct transition from write to read operations is enabled, then productivity is improved, but synchronization stability deteriorates
Solution Approach 1:
The patent applies preliminary action by performing synchronization adjustment before the transition from write to read operations. The test mode prepares the timing parameters in advance, ensuring that when the transition occurs, the system is already synchronized, thereby enabling direct transition without compromising stability while improving productivity.
Solution Approach 2:
The patent utilizes dynamics by making the timing parameters adjustable and adaptive. The system can dynamically change the generation moments of data and strobe signals based on the operational mode (write or read), allowing smooth transitions between modes while maintaining synchronization stability through flexible, real-time parameter adjustment.
Data Source
AI summary
A semiconductor system includes a first semiconductor device and a second semiconductor device. The first semiconductor device outputs a chip selection signal, a command/address signal and a clock signal. The first semiconductor device outputs first external data and a strobe signal during a write operation in a test mode and receives second external data to adjust an output moment of the strobe signal during a read operation in the test mode. The second semiconductor device is synchronized with the strobe signal to latch input data generated from the first external data during the write operation according to the chip selection signal and the command/address signal. The second semiconductor device generates output data from the input data and outputs the output data as the second external data during the read operation according to the chip selection signal and the command/address signal.