Serial Link Delay Synchronization via Frequency-Adaptive Offset
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Solution Overview
Problem
Maintaining link repeatability between components connected via point-to-point links is challenging due to changes in operating frequencies, which complicates testing, debugging, and manufacturing, as different test vectors are required for varying frequencies, leading to increased costs and complexity.
Innovation Solution
Implementing a de-skew mechanism and repeatability logic that applies a delay offset based on the operating frequency, ensuring consistent behavior across a range of frequencies by re-aligning bits and maintaining a constant total delay, allowing for the use of a single set of test vectors and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If point-to-point links are used to replace multi-drop bus, then link speed and performance are improved, but link repeatability and testing complexity deteriorate due to varying clock operating frequencies
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the delay offset based on the operating frequency. The repeatability logic modifies the delay parameter according to the detected clock frequency, allowing the system to maintain consistent behavior across different frequency ranges. This resolves the contradiction by making the delay parameter adaptive rather than fixed, thereby simplifying testing while maintaining high-speed performance.
Solution Approach 2:
The system transitions from a static delay configuration to a dynamic one where the delay offset automatically adjusts with frequency changes. The repeatability logic continuously monitors the operating frequency and modifies the delay accordingly, enabling the system to adapt to varying conditions without requiring separate test vectors for each frequency, thus reducing testing complexity while maintaining speed performance.
2Reliability
If delay offset is adjusted for different frequencies, then link repeatability is improved, but device complexity increases due to additional repeatability logic
Solution Approach 1:
The patent merges the delay offset adjustment functionality with the existing link configuration logic. The repeatability logic is integrated into the link layer control rather than being a separate standalone component, allowing delay adjustment to occur as part of the normal link initialization and configuration process. This integration approach improves link repeatability while minimizing the increase in device complexity.
Solution Approach 2:
The system implements self-service by automatically detecting the operating frequency and adjusting the delay offset without external intervention. The repeatability logic monitors the clock frequency itself and makes the necessary delay adjustments autonomously during link initialization, eliminating the need for manual configuration or external testing equipment, thereby improving reliability with minimal added complexity.
3Measurement precision
If separate test vectors are used for varying frequencies, then testing accuracy is improved, but manufacturing cost and time increase
Solution Approach 1:
The patent implements universality by creating a single test vector that functions across all frequency ranges. The repeatability logic ensures that the same test vector produces consistent, predictable behavior regardless of the operating frequency, allowing manufacturers to use one universal test procedure for all frequency points. This eliminates the need to develop and maintain separate test vectors for each frequency, thereby improving manufacturing efficiency while preserving testing accuracy through the frequency-adaptive delay adjustment.
Data Source
AI summary
Systems, methods, and other embodiments associated with synchronizing link delay is provided. In one example system, a system for synchronizing signal communication between a first electronic component and a second electronic component connected by one or more serial communication links comprises an offset logic configured to apply a selected offset to signal transmissions to cause a unidirectional delay between the first and the second electronic components to be synchronized for both directions of signal transmissions. A synchronization logic is configured to determine the uni-directional delay for signal transmissions between the first and second electronic components and configured to control the offset logic to apply the selected offset.