Variable Latency Elastic Buffer for Clock Skew Compensation
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Solution Overview
Problem
High-speed data transfer in communication systems often results in data alignment and frequency synchronization challenges due to differing clock rates and timing relationships between parallel communication channels, which existing technologies struggle to address effectively.
Innovation Solution
A variable latency elastic buffer system with a write and read pointer mechanism, controlled by a controller and correction logic, that adjusts data output to maintain a nominal fill level by padding or omitting data, ensuring clock correction and channel alignment across multiple data channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high-speed serial data streams are received at 3-10 Gbs, then data transfer speed is improved, but data alignment and frequency synchronization become difficult to maintain due to differing clock rates and timing relationships
Solution Approach 1:
The patent implements a variable latency buffer that dynamically adjusts its operation based on detected timing relationships between channels. The buffer modifies its latency characteristics in real-time to compensate for skew variations, allowing the system to maintain synchronization reliability while operating at high data transfer speeds across multiple parallel channels with different clock rates
Solution Approach 2:
The system employs feedback mechanisms that continuously monitor the timing relationships and skew between parallel data channels. Based on this feedback, the variable latency buffer adjusts its latency parameters to maintain proper data alignment, enabling high-speed operation while preserving synchronization integrity through closed-loop control
2Adaptability or versatility
If parallel data channels with different clock frequencies are used, then adaptability to varying timing relationships is improved, but buffer overflow or underflow conditions occur due to frequency differences
Solution Approach 1:
The variable latency buffer dynamically adapts its latency characteristics based on the detected frequency and timing relationships between parallel channels. By continuously adjusting its operation in response to measured skew and frequency differences, the buffer maintains reliable data flow without overflow or underflow conditions while supporting adaptable operation across channels with varying clock frequencies
Solution Approach 2:
The system changes the latency parameter of the buffer dynamically based on measured timing relationships between channels. By adjusting the latency parameter in response to detected frequency differences and skew, the buffer maintains proper synchronization and prevents overflow or underflow conditions while adapting to varying operating conditions
3Device complexity
If fixed latency buffers are used, then device complexity is reduced, but the system cannot compensate for skew variations between channels
Solution Approach 1:
The patent implements a variable latency buffer that transitions from a fixed to a dynamic structure, where the latency parameter can be adjusted based on detected skew conditions. This dynamic approach provides skew compensation capability while maintaining relatively simple device architecture through targeted variability rather than complex reconfigurable structures
Data Source
AI summary
A variable latency elastic buffer comprises a plurality of memory locations in which to hold data. A write and read pointer may point to respective write and read addresses of the plurality of locations in which to write and read data. A controller may hold or increment the address of the read pointer upon determining that the amount of data within the buffer differs from a nominal fill level. In a particular embodiment, initialization circuitry may be operable to initialize the read and write addresses of the respective pointers responsive to an initialization request. The read and write addresses may differ from one another by an offset value equal to a value programmed for the nominal value.