Fuse Data Acquisition Voltage Threshold Detection
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Solution Overview
Problem
Flash memory devices with fuse circuits often experience operational errors due to incorrect fuse data reading during power-up, caused by the ramping supply voltage not reaching a stable VCC level, leading to erroneous redundancy address selection and trimming operations.
Innovation Solution
The method involves detecting a voltage threshold level in fuse circuits, initializing them upon reaching this level, and reading the output based on a detected state change, ensuring accurate data transfer to a latch, with an enable fuse circuit having a lower erased threshold voltage for stable data retrieval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fuse data is read during power-up when supply voltage is ramping to VCC level, then device can initialize operations, but incorrect and unreliable data may be read causing operational errors
Solution Approach 1:
The patent applies preliminary action by detecting the voltage threshold level before initiating the fuse read operation. The system monitors when the supply voltage reaches the required threshold level, and only then proceeds to read the fuse data. This ensures that the read operation occurs under stable voltage conditions, preventing incorrect data acquisition while maintaining efficient power-up initialization.
2Loss of time
If fuse circuits are read immediately during power-up, then device initialization is faster, but erroneous redundancy address selection and trimming operations occur
Solution Approach 1:
The patent implements feedback by continuously monitoring the supply voltage level and using this information to control the timing of the fuse read operation. The system provides feedback signals that indicate when the voltage has reached the threshold level, and this feedback controls the enable signal for the fuse read circuit. This closed-loop approach ensures accurate redundancy address selection while minimizing power-up time.
3Measurement precision
If fuse read operation is delayed until voltage stabilizes, then data reading accuracy improves, but device initialization time increases
Solution Approach 1:
The patent merges the voltage monitoring function with the existing power-up reset circuitry and fuse read control logic. The threshold detection circuit is integrated into the control unit that already manages the fuse read operation, combining multiple functions into a unified control mechanism. This reduces the overall device complexity while maintaining high measurement precision for fuse data reading.
Data Source
AI summary
One or more embodiments of the present disclosure provide methods, devices, and systems for operating memory devices having fuse circuits. One method embodiment includes detecting a signal indicating whether a voltage used during operation of at least one of a number of fuse circuits has reached a threshold level, initializing at least one of the number of fuse circuits in response to detecting that the voltage has reached the threshold level, and reading an output of at least one of the number of fuse circuits at least partially in response to a detected state change of an output of the at least one initialized fuse circuit.