Safe Power-Up Reset Circuit for Stable Chip Initialization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
During the ramp-up of electronic circuits, voltage spikes and drops can lead to unintended initialization states, where elements may not function correctly or enter states not intended for normal operation, and the master chip may accidentally send chip select signals before all chips are initialized, causing interference or operational issues.
Innovation Solution
A method and electronic circuit design that initializes based on externally applied voltage thresholds, deactivating and activating enable signals for input and circuit elements, receiving a chip select signal and code word, and activating further circuit elements only when voltage exceeds a second threshold, ensuring safe operational states and preventing erroneous data writes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the master chip sends chip select signals during ramp-up to initialize chips, then the initialization process can start early, but voltage spikes and drops may cause unintended initialization states and operational errors
Solution Approach 1:
The patent applies preliminary action by activating the first enable signal for the input circuit before activating the second enable signal for the circuit elements. This staged approach allows the input circuit to be ready to receive and validate initialization commands before the main circuit elements become operational, ensuring that no unintended operations occur during voltage instability while still enabling early preparation for initialization.
Solution Approach 2:
The patent introduces an intermediary mechanism in the form of enable signals that mediate between the chip select signal reception and the actual circuit element activation. The first enable signal acts as an intermediary layer that allows the input circuit to process commands without immediately activating the full circuit, providing a buffer that prevents erroneous operations during ramp-up voltage fluctuations.
2Loss of time
If the input circuit is activated early to receive chip select signals, then initialization can begin sooner, but the circuit may process signals during voltage instability causing erroneous operations
Solution Approach 1:
The input circuit is activated in advance via the first enable signal to prepare for receiving chip select signals and command words, but the actual circuit elements remain inactive until the second enable signal is activated. This preliminary activation allows the system to be ready for initialization commands without immediately processing them, thus avoiding erroneous operations during voltage instability while minimizing initialization delay.
3Reliability
If voltage threshold monitoring is implemented to prevent erroneous operations, then initialization reliability improves, but the initialization process may be delayed waiting for stable voltage
Solution Approach 1:
The patent segments the voltage threshold monitoring into two distinct thresholds: a first threshold for activating the input circuit and a second, higher threshold for activating the circuit elements. This segmentation allows the system to begin preparation at the lower threshold while ensuring safe operation only at the higher threshold, thus improving reliability without excessive delay by allowing overlapping preparation phases.
Data Source
AI summary
A method is provided for initializing an electronic circuit in dependence on an externally applied voltage. The electronic circuit contains a first input circuit and further circuit elements. In a first step, a first enable signal for the operation of the input circuit and a further enable signal for the operation of the further circuit elements are deactivated if the voltage falls below a first threshold. In a second step, the first enable signal for the operation of an input circuit is activated and the further enable signal for the operation of the further circuit elements is deactivated if the voltage exceeds the first threshold. This is followed by the reception, with the first input circuit, of a chip select signal for the activation of the electronic circuit and of a code word at a terminal for the command bus. The activation of the further enable signal for the operation of the further circuit elements takes place if the received chip select signal and the received code word have predetermined values.