SerDes Retimer for Remote TX Training
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Solution Overview
Problem
Existing solutions for remote transmit (TX) training with a re-timer in Ethernet communications require additional hardware components and user software intervention, leading to interoperability issues and increased costs, while existing simplex retimers cannot leverage features to extend Ethernet device reach effectively.
Innovation Solution
Integration of a simplex retimer into a firmware-controlled scheme within the serializer/deserializer (SerDes) IP, allowing for transparent operation without additional hardware or software burdens, enabling flexible debugging and updates, and maintaining compliance with IEEE specifications by using a physical layer-aware approach.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing solutions for remote TX training with a re-timer are used, then training functionality is achieved, but additional hardware components and user software intervention are required, increasing device complexity and cost
Solution Approach 1:
The patent combines the re-timer functionality with the SerDes IP block, integrating the training sequence generation and retiming capabilities into a single unified component. This merging eliminates the need for separate hardware components and reduces software intervention requirements, directly resolving the contradiction between achieving training functionality and maintaining device complexity
Solution Approach 2:
The SerDes IP block is designed to perform multiple functions including data serialization/deserialization, training sequence generation, and retiming operations. By making the SerDes block universal and capable of handling multiple tasks, the patent eliminates the need for dedicated separate components, thereby reducing device complexity while maintaining full remote TX training functionality
2Length of stationary object
If existing simplex retimers are used, then signal retiming is achieved, but the ability to leverage features for extending Ethernet device reach is limited
Solution Approach 1:
The patent implements a feedback mechanism where the receiver detects training sequences, determines optimal equalization settings, and communicates these settings back to the transmitter. This closed-loop feedback enables dynamic optimization of signal quality and allows the system to adaptively extend Ethernet device reach by leveraging equalization features that existing simplex retimers cannot utilize
Solution Approach 2:
The system employs dynamic equalization settings that can be adjusted based on link conditions. The ability to change FIR filter coefficients and other transmission parameters in real-time allows the system to adapt to varying signal conditions and extend reach effectively, whereas static existing retimers cannot leverage these dynamic features
Data Source
AI summary
A device for transmit (TX) training a remote link partner (LP) includes a TX retimer module adjacent to a TX port of the device, and a receive (RX) retimer module adjacent to the TX retimer module. The RX retimer module copies first control and status data to the TX retimer module, and the TX retimer module provides second control and status data for TX training of the remote LP.