Clock Synchronization Circuit for Setup and Hold Timing Alignment
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Solution Overview
Problem
As clock frequencies increase, maintaining proper timing alignment between clock signals and synchronization signals in electronic systems becomes challenging due to part-to-part differences among circuits and variations in environmental factors, leading to inconsistent results and potential violations of setup and hold time constraints.
Innovation Solution
The proposed solution involves regulating the timing relationship between the capture edge of the clock signal and the transition of the synchronization signal by providing delayed synchronization and clock signals, using test circuits to determine and adjust the skew between them, ensuring that signal transitions occur outside the setup and hold window, thereby maintaining synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If clock frequency is increased to improve system performance, then productivity increases, but timing alignment between clock signals and synchronization signals deteriorates due to part-to-part differences and environmental variations
Solution Approach 1:
The patent adjusts timing parameters (skew compensation values) dynamically based on measured timing relationships between clock and synchronization signals. By changing these parameters in response to environmental variations and circuit differences, the system maintains reliable timing alignment even at high clock frequencies
Solution Approach 2:
The patent implements a feedback mechanism where the actual timing relationship between clock and synchronization signals is measured, and this information is used to adjust skew compensation parameters. This closed-loop approach ensures timing alignment is maintained despite variations in circuit behavior due to temperature, voltage, or manufacturing differences
2Device complexity
If standard synchronization timing is used without adjustment, then device complexity is minimized, but manufacturing precision deteriorates due to setup and hold time violations
Solution Approach 1:
The patent performs preliminary timing measurements and calculations to determine appropriate skew compensation parameters before actual synchronization operations. By pre-adjusting timing parameters based on measured relationships, the system ensures setup and hold time constraints are met without requiring complex real-time adjustment mechanisms
Data Source
AI summary
Circuits and methods are introduced to allow for timing relationship between a clock signal and a synchronization signal to be observed. The observations may include observing the timing relationship between a capture edge of the clock signal and a transition of the synchronization signal. Based on the observations the timing of the synchronization signal transition may be adjusted. Observing the timing relationship may include providing a delayed synchronization signal and a delayed clock signal. The delayed synchronization signal may provide what happens before the capture edge of the clock signal. The delayed clock signal may provide what happens after the capture edge of the clock signal.