Synchronized Multi-Stack Test Instruments for Memory Signal Validation
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Solution Overview
Problem
Current validation testing methods for memory devices and integrated circuits are inefficient due to sequential acquisition of data strobe and data signals, leading to increased test time and error-prone processes, especially when dealing with multiple data signals like in DDR SDRAMs, which require comprehensive validation testing.
Innovation Solution
A system utilizing synchronized multiple test and measurement instruments to capture and analyze data signals and data strobe signals in parallel, enabling simultaneous validation testing and immediate display of results, reducing the need for sequential acquisition and manual reconfiguration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sequential acquisition of DQS and DQ signals is used, then test equipment complexity is reduced, but test time increases significantly
Solution Approach 1:
The patent combines multiple test instruments (oscilloscope, logic analyzer, spectrum analyzer) into a synchronized parallel testing system that simultaneously acquires DQS and multiple DQ signals. This merging of instruments and their acquisition channels enables comprehensive signal validation in a single test cycle, resolving the contradiction between equipment complexity and test time by justifying the added complexity through drastic time reduction.
Solution Approach 2:
The patent transitions from sequential one-dimensional signal acquisition to parallel multi-dimensional acquisition by simultaneously capturing multiple DQ signals along with DQS. This dimensional expansion in the acquisition space allows all signals to be tested concurrently rather than sequentially, eliminating the time penalty while managing complexity through systematic synchronization.
2Ease of operation
If manual connection of DQ signals to test ports is performed, then ease of operation is reduced, but measurement precision can be maintained
Solution Approach 1:
The system implements automated signal routing and acquisition where the test instruments automatically connect to and acquire the appropriate DQ and DQS signals without manual intervention. The synchronization mechanism and automated configuration eliminate manual connection requirements while maintaining measurement precision through systematic, error-free signal capture.
Solution Approach 2:
The patent replaces manual mechanical connection processes with automated electronic signal routing and digital acquisition. Instead of physically connecting signals manually, the system uses automated instrument control and electronic switching to route signals, eliminating manual operations while preserving measurement accuracy through consistent, programmable connection procedures.
3Device complexity
If sequential testing of multiple DQ signals is performed, then device complexity is reduced, but reliability of testing decreases due to signal variations
Solution Approach 1:
The patent employs periodic synchronized acquisition cycles where all DQ and DQS signals are captured simultaneously at regular intervals. This periodic parallel acquisition ensures that signal variations are captured consistently across all channels at the same time points, improving testing reliability by eliminating sequential timing discrepancies while managing complexity through rhythmic, repeating test patterns.
Solution Approach 2:
The system implements feedback mechanisms where acquisition results from all signals are analyzed together, and the system automatically adjusts acquisition parameters to maintain optimal signal capture. This feedback loop ensures consistent, reliable testing by continuously monitoring and correcting for signal variations across all channels simultaneously, rather than sequentially.
Data Source
AI summary
A test and measurement system includes a multi-stack test subsystem including a plurality of test and measurement instruments, each instrument coupled to a device under test (DUT) to receive a plurality of test signals from the DUT during a test mode of operation. One test and measurement instrument is designated as a master and the remainder are designated as extension test and measurement instruments. The master communicates control signals to each of the extensions to synchronize the test and measurement instruments to simultaneously acquire the plurality of test signals provided by the DUT. An automation engine is coupled to the multi-stack test subsystem to receive the acquired plurality of test signals from the master, and the automation engine analyzes the acquired test signals to perform validation testing for each of plurality of test signals and simultaneously display results of the validation testing for the plurality of test signals.