Signal Maintaining Circuit for Bus Interface Reset
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Solution Overview
Problem
In systems using a serial bus like the I2C bus, when the bus interface is reset, the output signal to the electronic circuit is lost, causing the circuit to stop its last operation even if there is no failure, and making it difficult to restore communication and maintain operation.
Innovation Solution
A control system with a signal maintaining circuit that keeps the output signal value to the electronic circuit constant during a bus interface reset, allowing the electronic circuit to continue operations until the bus is restored, and a reset control circuit that resets the bus interface after maintaining the signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bus interface is reset to restore communication via the serial bus, then communication reliability is improved, but the output signal to the electronic circuit is lost causing operation interruption
Solution Approach 1:
The signal maintaining circuit performs preliminary action by storing the output signal value from the bus interface before the reset operation occurs. When a reset is initiated, the maintaining circuit has already captured and preserved the last valid signal value, ensuring that the electronic circuit continues to receive a valid signal during and after the bus interface reset, thus preventing operation interruption while allowing communication restoration.
2Reliability
If the bus interface is reset, then the bus can be restored for communication, but the electronic circuit becomes unable to continue the last operation
Solution Approach 1:
The signal maintaining circuit acts as an intermediary between the bus interface and the electronic circuit. It receives the output signal from the bus interface, stores its value, and provides a maintained signal to the electronic circuit. This intermediary function allows the bus interface to be reset and restored for communication while the maintaining circuit bridges the gap by providing continuous signal output, enabling the electronic circuit to maintain operation without interruption.
Data Source
AI summary
A bus interface receives, via a bus, a control signal for controlling an electronic circuit, and outputs a signal corresponding to the received control signal to the electronic circuit. A signal maintaining circuit maintains the value of the signal to be output from the bus interface to the electronic circuit in accordance with an instruction from a reset control circuit. When the bus becomes unusable due to termination of operations of the control device or the like, the reset control circuit causes the signal maintaining circuit to maintain the value of the output signal to the electronic circuit, and subsequently resets the bus interface so as to restore the bus.