C-PHY Reverse Mode Simplified Receiver Circuit
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Solution Overview
Problem
High-speed data communication interfaces, such as the C-PHY standard, are complex and costly, making them unsuitable for low-speed applications, and existing solutions do not efficiently simplify the receiver implementation in image sensors for high-speed reverse communication.
Innovation Solution
A three-wire communication link using a simplified 3-phase encoding scheme with reduced zero-crossings in the receiver circuit, allowing for efficient data transmission and reception with fewer active drivers, and implementing an alternate low-power C-PHY protocol to simplify clock recovery circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the C-PHY interface is used for high-speed data communication, then data transmission speed is improved, but circuit complexity and cost increase
Solution Approach 1:
The patent implements dynamic operation modes that allow the interface to switch between high-speed and low-speed communication. The system can adaptively select the appropriate speed mode based on application requirements, enabling the same hardware to serve both high-performance and cost-sensitive applications without requiring separate interface designs.
Solution Approach 2:
The patent changes operational parameters of the C-PHY interface to reduce complexity for low-speed applications. By modifying signaling rates, voltage levels, or protocol features, the interface can operate in a simplified mode that maintains compatibility with the standard while reducing circuit complexity and cost for applications that do not require maximum speed.
2Device complexity
If the C-PHY interface is simplified for low-speed applications, then device complexity is reduced, but high-speed communication capability is lost
Solution Approach 1:
The interface is designed with dynamic reconfiguration capabilities that allow it to transition between simplified low-speed operation and full-featured high-speed operation. This enables the system to use the simpler, lower-cost circuit implementation for most applications while retaining the option to activate high-speed mode when performance requirements demand it.
Solution Approach 2:
The patent creates a universal interface design that can perform multiple functions across different speed regimes. The same hardware infrastructure supports both simplified low-speed communication and full-capability high-speed communication, eliminating the need for separate interface designs and allowing a single component to serve diverse application needs.
3Adaptability or versatility
If full C-PHY protocol is implemented, then communication versatility is improved, but power consumption increases
Solution Approach 1:
The patent implements a strategy of using only the necessary subset of C-PHY protocol features required for each specific application. Instead of implementing the complete protocol stack with all its features, the system activates only the portions needed for the current communication task, thereby reducing power consumption while maintaining full protocol versatility when required.
Solution Approach 2:
The power management system dynamically adjusts protocol activation based on operational requirements. During low-activity or power-sensitive periods, the system deactivates unnecessary protocol features and operates in a reduced-function mode. When high-performance communication is needed, the full protocol versatility is activated, allowing the system to optimize power consumption across different operational states.
Data Source
AI summary
Systems, methods and apparatus are described that facilitate transmission of data between two devices within an electronic apparatus. A data transfer method includes receiving from a three-wire interface, a first packet of data encoded in a first sequence of symbols representing transitions in signaling state of the three wires, and transmitting on the three-wire interface, a second packet of data encoded in a second sequence of symbols representing transitions in signaling state of the three wires. The first sequence of symbols may include up to five types of symbol. The second sequence of symbols may include two or three types of symbol.