MIPI Analog Switch With Clock-Swing Sensor Source Selection
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Solution Overview
Problem
Existing MIPI interface systems require an additional GPIO interface to switch between multiple data sources, which is inefficient and adds complexity.
Innovation Solution
The system uses clock signals to control the selection between two sources connected to an MIPI interface, eliminating the need for an external GPIO interface by detecting voltage swings in the clock signals to determine which source to connect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an additional GPIO interface is used to switch between multiple data sources, then the selection control is achieved, but the device complexity and number of signal lines increase
Solution Approach 1:
The clock signal is made to serve dual purposes: its primary function of clocking data and a secondary function of encoding source selection information. By utilizing the existing clock signal's voltage swing characteristics to indicate which data source should be selected, the patent eliminates the need for a separate GPIO interface, thereby reducing device complexity while maintaining selection control capability
Solution Approach 2:
The patent combines the source selection control function with the existing clock signal transmission path. Instead of using separate control lines (GPIO), the selection information is merged into the clock signal itself through voltage swing modulation, reducing the total number of signal lines and simplifying the interface architecture
2Ease of operation
If an additional GPIO interface is used to switch between multiple data sources, then the source selection is achieved, but the number of signal lines increases
Solution Approach 1:
The clock signal performs multiple functions simultaneously: data clocking and source selection indication. By encoding selection information in the clock signal's voltage characteristics, the patent eliminates the need for additional dedicated control signal lines, thereby reducing the total quantity of signal lines required
Solution Approach 2:
The patent merges the source selection control function into the existing clock signal path. The clock signal's voltage swing is modulated to carry selection information, combining what would traditionally require separate control lines into the existing data transmission infrastructure, thus reducing the number of signal lines
Data Source
AI summary
An MIPI interface is connected to two sensor sources that each may be transferring both high and low speed information, typically video information in the high speed state. The clock signals are monitored and when one of the clock signals exceed a threshold, an analog switch between the MIPI interface and the sensors, may connect the other source to the MIPI interface.