Timestamp Control Loop for Cross-Clock Synchronization Precision
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Solution Overview
Problem
Communication systems face challenges in synchronizing devices with different clock domains due to indeterminate signal transmission times, leading to potential data corruption and synchronization errors.
Innovation Solution
A timestamp control loop is implemented in receiving devices, which includes an internal timestamp generator that adjusts its increment rate based on frequency and error correction mechanisms to synchronize with a primary device, even when clock domains differ.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a timestamp control loop with error correction is implemented, then synchronization precision is improved, but device complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the receiving device monitors the arrival time of periodic signals and compares it with the expected time based on its internal timestamp. The error difference is calculated and used to adjust the increment rate of the internal timestamp generator, creating a closed-loop control system that continuously refines synchronization precision.
Solution Approach 2:
The receiving device performs self-correction by autonomously adjusting its internal timestamp increment rate based on the calculated error from received signals. The system uses its own internal resources (timestamp generator, error calculation logic) to maintain synchronization without requiring external intervention or complex coordinated control between devices.
2Adaptability or versatility
If timestamp sharing across multiple target units is implemented, then adaptability is improved, but reliability deteriorates due to clock domain crossings
Solution Approach 1:
The patent introduces a periodic synchronization signal as an intermediary that mediates between the primary device's timestamp source and multiple target units in different clock domains. This intermediate signal provides a common reference point that allows each target unit to independently adjust its timing without direct interaction with the primary device, eliminating the need for complex cross-clock-domain timestamp sharing.
Solution Approach 2:
The system segments the synchronization function by having each target unit independently calculate and adjust its own timestamp based on received periodic signals. Instead of sharing a single timestamp source across clock domains, each unit maintains its own timestamp generator that is independently controlled, isolating clock domain crossings and their associated reliability issues.
Data Source
AI summary
A communication system includes a primary clock device having a precision clock and configured to transmit pulse signals at a constant rate. The communication system further includes a plurality of agent devices, each agent device comprising an internal timestamp control loop, a timestamp generator configured to update timestamps at an adjustable increment rate, and control logic configured to synchronize the agent device with the primary clock device using the internal timestamp control loop. The control logic enables each agent device to maintain synchronization with the primary clock device by adjusting the adjustable increment rate based on timing differences between estimated and actual signal reception times.