Adaptive Data Alignment for Multi-Lane SerDes Skew Control
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Solution Overview
Problem
In serial data transmission systems, maintaining minimal lane-to-lane skew between data signals becomes increasingly challenging as data bit rates increase, especially in multi-lane and multi-link systems, leading to instability due to voltage and temperature variations.
Innovation Solution
A data transmission system with a control circuit that dynamically adjusts the timing of transmit and receive data lanes using skew control signals to minimize skew, allowing for adaptive data alignment and additional timing margins, thereby enhancing robustness against environmental variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data bit rates are increased to improve transmission speed, then productivity is improved, but lane-to-lane skew increases leading to timing instability
Solution Approach 1:
The patent implements dynamic skew adjustment by introducing control circuits that continuously monitor and adjust the timing of individual data lanes. The system uses skew control signals to dynamically modify the timing of transmit and receive data lanes, allowing the system to adapt to changing conditions while maintaining timing stability at high data rates.
Solution Approach 2:
The patent employs feedback mechanisms where the control circuit receives information about actual lane alignment and generates appropriate skew control signals. The system monitors the timing relationships between lanes and adjusts skew compensation accordingly, creating a closed-loop control system that maintains timing stability despite high data rate operations.
2Productivity
If multi-lane SerDes interfaces are used to improve data transmission capacity, then productivity is improved, but lane-to-lane skew becomes more difficult to control
Solution Approach 1:
The patent segments the timing control function by providing individual skew control signals for each data lane. Instead of attempting to control all lanes simultaneously as a single system, the invention divides the control into lane-specific adjustments, where each lane can be independently tuned to achieve optimal alignment.
Solution Approach 2:
The control circuit is designed to handle multiple functions: it generates skew control signals for transmit lanes, processes skew control signals for receive lanes, and coordinates adjustments across all lanes. This universal control mechanism simplifies the overall system by providing a single point of control for multi-lane timing management.
3Productivity
If fabrication process density is increased to improve integration, then productivity is improved, but skew control becomes more challenging
Solution Approach 1:
The patent changes the timing parameters of individual lanes through skew control signals. By adjusting the timing offset of each lane dynamically, the system compensates for variations introduced by dense fabrication processes. This parameter adjustment allows the system to achieve precise skew control despite manufacturing variations in high-density processes.
4Reliability
If skew adjustment mechanisms are added to minimize lane-to-lane skew, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent introduces skew control signals as intermediary control elements that mediate between the data lanes and the control logic. These control signals act as intermediaries that carry timing adjustment information, allowing the control circuit to manage skew without directly modifying the data paths themselves.
Data Source
AI summary
An apparatus including a transmit circuit, a receive circuit, and a control circuit. The control circuit may be configured to present a plurality of transmit data lanes in response to (i) a plurality of transmit data sources and (ii) a plurality of first skew control signals. The receive circuit may be configured to generate a plurality of receive data lanes in response to (i) the plurality of transmit data lanes and (ii) a plurality of second skew control signals. The control circuit may be configured to generate the first skew control signals and the second skew control signals in response to an alignment of the plurality of receive data lanes. The control circuit may adjust a timing of the receive data lanes and the transmit data lanes to achieve arrival of the receive data lanes across a transmission medium within a skew parameter.