Bit Synchronization for Multi-Pin Asynchronous Serial Interfaces
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Solution Overview
Problem
In multi-pin asynchronous interfaces, reconstructing original messages from subdivided serial data words is challenging due to varying path delays caused by environmental factors, limiting data throughput and requiring efficient bit synchronization techniques.
Innovation Solution
The method involves bit synchronization modules that oversample serial bit streams at an integer multiple of the data rate to detect phases with minimal transitions, selecting a stable phase for data extraction and applying a delay to maintain a constant data rate, allowing for synchronization across multiple channels with a common clock signal, and further processing by word synchronization units to reassemble data words.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data is transmitted across multiple serial channels to increase throughput, then data rate is improved, but path delay variations (skew) increase due to environmental factors
Solution Approach 1:
The patent applies preliminary action by pre-establishing a common clock signal that all serial channels synchronize to before data transmission begins. This common clock reference is distributed to all receiving channels in advance, enabling them to align their sampling timing proactively rather than reactively correcting skew after data arrives. The system prepares synchronization parameters and clock references beforehand to prevent skew accumulation during data transfer.
Solution Approach 2:
The patent implements feedback mechanisms where the system continuously monitors path delay variations across multiple serial channels and dynamically adjusts sampling timing based on detected skew. The common clock signal incorporates feedback loops that measure actual channel delays and modify phase alignment accordingly, allowing the system to self-correct synchronization drift caused by environmental factors like temperature and voltage variations during operation.
2Speed
If high-speed clock sources are used to increase serial bit transfer rate, then data rate is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies universality by using a single common clock signal that serves multiple functions across all serial channels simultaneously. This common clock reference is distributed to all receiving channels, replacing the need for separate high-speed clock sources for each channel. The same clock infrastructure supports synchronization, timing recovery, and data sampling across the entire multi-channel system, reducing overall device complexity while maintaining high aggregate throughput.
Data Source
AI summary
Methods, devices and systems are provided for bit synchronizing multiple serial bitstreams (106) with a common clock signal (116). Activity occurring in each bitstream is detected (304) for each of a plurality of phases corresponding to cycles of the common clock signal. One of the plurality of phases is selected (308) for each of the serial bitstreams based upon the activity detected within the selected phase. Data is then extracted (322) from the selected phase for each of the serial bitstreams using the common clock signal to thereby bit synchronize each of the plurality of serial bitstreams to each other.