Semiconductor Alert Pad Monitoring for Real-Time Internal Signal Access
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Solution Overview
Problem
Existing integrated circuit monitoring methods either increase chip size with additional test pads or cannot monitor internal signals in real time, especially during data transmission and reception, and lack the ability to apply signals internally for misoperation or operation margin evaluation.
Innovation Solution
A monitoring device with a plurality of data input/output pads, an alert pad for error information, and a configuration to output data error information in one mode and monitoring information in another, including an error detection signal selection unit, output driver, input driver, and test mode control unit to selectively apply and detect signals for real-time monitoring and internal alert signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a test pad is additionally provided in an integrated circuit to monitor voltage or temperature, then monitoring capability is improved, but chip size increases
Solution Approach 1:
The alert pad is designed to serve multiple functions: it can output data error information during normal operation, output monitoring information when in test mode, and receive external alert signals. This multi-functionality eliminates the need for separate dedicated test pads, thereby maintaining monitoring capability while reducing chip size.
Solution Approach 2:
The patent combines the functions of data input/output pads and alert signal pads into a single alert pad structure. By merging these functions, the chip requires fewer separate pads, reducing overall chip area while maintaining both data transmission and alert/monitoring capabilities.
2Area of stationary object
If data pads are used to acquire monitoring information in a specified test mode, then chip size is reduced, but real-time monitoring capability during data transmission is lost
Solution Approach 1:
The alert pad's function is made dynamic through mode-dependent behavior. In test mode, it outputs monitoring information; in normal data transmission mode, it outputs data error information and can receive external alert signals. This dynamic functionality enables real-time monitoring during actual operation without requiring separate dedicated test pads.
Solution Approach 2:
The alert pad serves as a universal interface that adapts its function based on operational mode. It can simultaneously handle data error output during normal operation and monitoring information output during test mode, providing continuous real-time monitoring capability while maintaining small chip size.
3Measurement precision
If a dedicated test pad is provided for monitoring, then monitoring precision is improved, but device complexity increases
Solution Approach 1:
The alert pad is designed as a multi-functional component that handles both data I/O and alert/monitoring functions. By consolidating these functions into a single pad with mode-dependent behavior, the patent reduces the number of separate components needed, thereby reducing device complexity while maintaining monitoring precision through dedicated error detection and alert signal handling pathways.
Data Source
AI summary
A semiconductor memory device includes a plurality of data input/output pads configured to transmit and receive data to and from memory cells, an alert pad configured to output data error information while the data is transmitted and received, and a monitoring device configured to output the data error information to the alert pad in a first mode and to output monitoring information to the alert pad in a second mode.