I/O Edge Detection for Dynamic High-Speed Signal Alignment
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Solution Overview
Problem
High-speed input signals in integrated circuits often fail to be sampled at the center of their eye pattern, leading to inefficiencies and errors due to misalignment with the clock signal.
Innovation Solution
The integration of an edge detector within the input/output interface of the integrated circuit, which uses delay lines and sampling flip flops to determine if the input signal is too early or late, and adjusts the delay accordingly to align it with the clock signal, thereby ensuring proper sampling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional external alignment methods are used, then alignment capability is provided, but device complexity and power consumption increase
Solution Approach 1:
The patent combines the signal alignment function with the existing input/output interface by integrating an edge detector into the I/O tile. This merging eliminates the need for separate external alignment circuits, thereby reducing device complexity while maintaining alignment capability. The edge detector is built into the I/O tile structure, sharing resources with other I/O functions.
Solution Approach 2:
The I/O tile performs signal alignment autonomously using its own integrated edge detector, without requiring external alignment circuits or additional complex logic fabric resources. The edge detector automatically detects signal edges and provides alignment information, enabling the I/O interface to self-align signals without external intervention.
2Reliability
If external alignment circuits are implemented, then signal alignment is achieved, but power consumption increases
Solution Approach 1:
The alignment function is merged with the I/O interface circuitry, eliminating separate external alignment circuits that would consume additional power. The integrated edge detector shares the same power domain and physical infrastructure as the I/O interface, reducing overall power consumption compared to external alignment solutions.
Solution Approach 2:
The I/O interface autonomously performs alignment using its own integrated resources, avoiding the need for external alignment circuits that would draw additional power. The edge detector within the I/O tile provides alignment functionality without requiring external power-consuming alignment hardware.
3Measurement precision
If dynamic alignment is implemented, then sampling accuracy improves, but resource usage increases
Solution Approach 1:
The dynamic alignment functionality is merged with the I/O tile structure, sharing physical resources such as logic elements, routing, and power infrastructure. This integration allows dynamic alignment to be achieved without proportionally increasing the quantity of logic fabric resources, as the alignment function shares the I/O tile's existing resource pool.
Data Source
AI summary
A method and apparatus for aligning an input signal to a clock signal in an integrated circuit are disclosed. The method includes receiving an input signal; determining whether the input signal is arriving too early or too late via a plurality of delay lines; and adjusting a delay of the plurality of delay lines in accordance with a result of the determining.