IC Output Switching Circuit for Low-Delay Mission Signals
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Solution Overview
Problem
Existing integrated circuits face a time delay in test mode operations due to the need for mission signals to traverse switching circuits, which increases the time required for testing and can impact efficiency.
Innovation Solution
The implementation of a switching circuit design where the test signal, boundary scan test signal, and mission signal paths are optimized to minimize switching delays by using selectors and an OR gate to control signal routing, allowing the mission and test circuitry to share output circuits with reduced delay, and ensuring the TM terminal is isolated from boundary scan operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mission signals traverse switching circuits to share output circuits between test and mission modes, then output circuits can be shared between modes, but time delay increases due to additional switching stages
Solution Approach 1:
The patent segments the switching control into two independent parts: a first selector controlled by a first control signal for routing mission signals, and a second selector controlled by a second control signal for routing test signals. This segmentation allows independent optimization of signal paths, reducing the time delay for mission signals while maintaining the ability to share output circuits between test and mission modes.
Solution Approach 2:
The patent implements dynamic control of the switching circuits using independent control signals (TM and MODE) that can be adjusted based on the operating mode. The first selector responds to the MODE signal and the second selector responds to the TM signal, allowing the system to dynamically optimize signal routing paths and minimize switching delays when transitioning between test and mission modes.
2Adaptability or versatility
If multiple selectors are used to route test and mission signals through sharing output circuits, then output circuit sharing is enabled, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the switching circuits to handle multiple signal types (mission signals and test signals) through a unified architecture. The first selector and second selector together form a universal switching structure that can route any input signal to any output circuit, reducing the need for separate dedicated switching paths and thereby reducing overall device complexity.
Solution Approach 2:
The patent implements preliminary action by pre-configuring the switching circuit architecture with dedicated control logic for each signal type. The control signals TM and MODE are prepared in advance to automatically route the appropriate signals through the selectors, eliminating the need for complex runtime decision logic and reducing device complexity.
Data Source
AI summary
An integrated circuit apparatus includes a switching circuit that provides respective signal paths to permit a mission signal, a test signal, and a boundary scan test signal to share an output terminal. The signal path associated with the mission signal imposes a smaller switching delay than do the signal paths associated with the test and boundary scan test signals.