Semiconductor Test Entry Control Block for Stable Mode Switching
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Solution Overview
Problem
As semiconductor apparatuses trend towards miniaturization, high-speed operation, and multi-functionality, they require stable entry into various test modes to pass increased testing requirements, but existing technologies face challenges in ensuring reliable and controlled test entry processes.
Innovation Solution
A semiconductor apparatus is designed with a test entry control block that generates trigger signals and a reset signal based on a test setting command and addresses, enabling a test entry signal only when specific conditions are met, and includes a test entry signal generation block initialized by a reset signal to ensure stable and controlled test entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple test modes are supported to meet increased testing requirements, then the adaptability of the semiconductor apparatus is improved, but the device complexity increases due to the need for multiple test entry control mechanisms
Solution Approach 1:
The test entry control block is designed to universally handle multiple test modes (boundary scan, JTAG, IEEE 1149.1, IEEE 1149.7) through a single integrated structure. The block receives test setting commands and addresses, generates trigger signals and reset signals, and controls test entry for various test modes using the same fundamental mechanism, thereby supporting multiple test modes without proportionally increasing complexity.
Solution Approach 2:
The test entry control block is segmented into functional sub-components including a command decoding unit that processes test setting commands, an address decoding unit that processes addresses, a trigger signal generation unit, and a reset signal generation unit. This segmentation allows each component to handle specific aspects of test mode entry independently, making the overall system more manageable and less complex while maintaining support for multiple test modes.
2Reliability
If stable test entry control is implemented through sequential trigger signals, then the reliability of test mode entry is improved, but the time required for test entry increases due to sequential signal generation
Solution Approach 1:
The control block generates multiple trigger signals (first trigger signal, second trigger signal, third trigger signal) in sequential order as preliminary actions before enabling the test entry signal. This preliminary sequential generation ensures that all necessary conditions are met and validated before the actual test mode entry occurs, thereby maintaining high reliability. The sequential nature is optimized so that each trigger signal preparation is done in advance according to predetermined conditions, minimizing the actual test entry time.
Solution Approach 2:
The control block monitors the generation status of trigger signals and uses this feedback to control the enabling of the test entry signal. The test entry signal is enabled only when the trigger signals are generated in the correct sequential order, providing feedback-based validation that ensures reliable test mode entry. This feedback mechanism prevents incorrect or premature test entry while maintaining efficient timing.
3Measurement precision
If reset signal generation is controlled by command detection, then the precision of test entry control is improved, but the difficulty of detecting and measuring test conditions increases
Solution Approach 1:
The control block uses an intermediary command detection mechanism that translates complex test conditions into simplified internal signals. When a test setting command is received, the block detects the command type and generates appropriate trigger and reset signals based on predetermined conditions. This intermediary detection layer simplifies the measurement and control process by converting diverse test mode requirements into a standardized internal signal format, thereby improving control precision without significantly increasing detection difficulty.
Data Source
AI summary
A semiconductor apparatus includes a test entry control block configured to generate a plurality of trigger signals and a reset signal according to a test setting command and addresses; and a test entry signal generation block configured to enable a test entry signal when the plurality of trigger signals are sequentially enabled.