Timeout Clock Generation for Cross-Domain Data Comparison
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Solution Overview
Problem
Existing systems face challenges in accurately comparing data between clock domains with varying latency due to unknown or variable clock signal phases and frequencies, leading to inefficiencies and increased circuit area requirements.
Innovation Solution
Implement timeout period generation circuitry that generates a timeout clock signal based on both the first and second clock periods, allowing for synchronized data comparison without the need for counters at each clock domain crossing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional data comparison methods are used between clock domains, then data comparison can be performed, but circuit area increases and latency is extended due to the need for counters at each clock domain crossing
Solution Approach 1:
The patent extracts the timeout period generation functionality from the traditional counter-based synchronization mechanism. By generating a dedicated timeout clock signal that spans both clock domains, the system removes the need for individual counters at each clock domain crossing, thereby reducing circuit area while maintaining data comparison accuracy.
Solution Approach 2:
The timeout clock signal serves multiple functions: it provides timing for data comparison across clock domains, defines the comparison window, and eliminates the need for separate counter circuits. This multi-functional approach reduces overall circuit complexity and area while maintaining precise data comparison.
2Measurement precision
If traditional data comparison methods are used between clock domains, then data comparison can be performed, but latency increases due to the need for counters at each clock domain crossing
Solution Approach 1:
The patent removes the latency introduced by counter-based synchronization mechanisms. By using a timeout clock signal that directly defines the comparison window without requiring counter overhead, the system reduces the time needed for data comparison while maintaining accuracy.
Solution Approach 2:
The timeout clock signal is generated in advance to define the comparison window before data comparison begins. This preliminary timing establishment eliminates the need for runtime counter operations, thereby reducing comparison latency while maintaining precise data comparison.
3Measurement precision
If counters are implemented at each clock domain crossing to handle variable latency, then data comparison accuracy is maintained, but device complexity increases
Solution Approach 1:
The patent extracts the timing control functionality from complex counter-based synchronization circuits. By using a timeout clock signal that inherently handles variable latency between clock domains, the system maintains data comparison accuracy while significantly reducing circuit complexity.
Solution Approach 2:
The timeout clock signal provides universal timing control for data comparison across different clock domains, replacing multiple specialized counter circuits. This multi-functional approach simplifies the overall device architecture while maintaining precise data comparison capabilities.
Data Source
AI summary
There is provided an apparatus comprising first processing circuitry operating in a first clock domain having a first clock signal operating at a first clock period. The apparatus is provided with timeout period generation circuitry to couple with a second clock domain to generate a timeout clock signal, the second clock domain comprising second processing circuitry and having a second clock signal operating at a second clock period. The apparatus is provided with control circuitry to compare first data generated by the first processing circuitry against second data received from the second processing circuitry. The control circuitry is configured to indicate when the first and second data do not match within a timeout period. The timeout period generation circuitry is configured to receive second clock information indicative of the second clock period and to generate the timeout clock signal based on the second clock information and the first clock period.