Semiconductor Interface Isolation for Testing
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Solution Overview
Problem
Existing semiconductor device testing techniques face challenges due to increased complexity, longer testing times, and the inability to perform in-system tests after the device is installed, as well as discrepancies in power, temperature, and environmental conditions between testing and actual operation.
Innovation Solution
A hardware-based protection module is implemented to isolate the link interface during testing by controlling clock signals and using a clamp to prevent corruption, allowing for faster testing and compatibility with in-system tests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ATE is used to test semiconductor devices with increasing complexity, then testing coverage is improved, but testing time increases significantly
Solution Approach 1:
The patent segments the testing process by introducing a protection module that divides the interface circuit into protected and unprotected portions during testing. This allows independent testing of different device portions without requiring complete system isolation, thereby reducing overall testing time while maintaining comprehensive coverage.
Solution Approach 2:
The protection module is activated before testing begins to preemptively isolate the interface circuit from the rest of the device. This preliminary action prevents potential corruption of test data and eliminates the need for extensive post-test validation, thus reducing total testing time while ensuring reliable results.
2Measurement precision
If dedicated test input/output pins are used for ATE testing, then testing accuracy is improved, but device pin availability decreases
Solution Approach 1:
The patent makes the interface circuit multi-functional by enabling it to serve both as a high-speed data transfer link in normal operation and as a test data transfer path when the protection module is activated. This eliminates the need for dedicated test pins, allowing the same pins to be used for both operational and testing purposes, thereby maintaining pin availability while ensuring testing accuracy.
3Stability of the object's composition
If ATE testing is performed under controlled conditions, then test consistency is improved, but in-system testing capability is lost
Solution Approach 1:
The protection module is integrated directly into the semiconductor device, enabling it to perform self-testing functions without external ATE equipment. The module can be activated by software or hardware triggers within the device itself, allowing in-system testing to be performed under actual operating conditions while maintaining test consistency through the same protection mechanisms used in controlled ATE environments.
Data Source
AI summary
Techniques for isolating interfaces while testing a semiconductor device include a semiconductor device having a link interface that couples the semiconductor device to a high-speed data transfer link, a clock control unit that transmits one or more clock signals to the link interface; and a protection module. The protection module asserts a clock stop request to the clock control unit and, in response to receiving a clock stop acknowledgement from the clock control unit, asserts a clamp enable to cause the link interface to be isolated from portions of the semiconductor device. After waiting for a first predetermined period of time to expire, the protection module de-asserts the clock stop request.