Timing Margin Sensor for Dynamic Clock Adjustment
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Solution Overview
Problem
As integrated circuits age, the critical path delay increases, leading to timing violations and potential failures due to reduced timing margins, which existing systems struggle to detect and respond to efficiently.
Innovation Solution
A timing margin sensor is employed to generate a calibrated delay that corresponds to a known logic circuit delay, using a delay circuit to lock a first delay to a clock period, and a programmable selector to adjust the delay, enabling rapid detection of timing violations and adjustment of the clock period to maintain sufficient timing margin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the clock frequency is reduced to avoid timing violations, then the system reliability is improved, but the productivity deteriorates
Solution Approach 1:
The timing margin sensor performs preliminary detection of timing violations by continuously monitoring the critical path delay and comparing it against the clock period. This early warning system allows the system to take preventive action (reducing clock frequency) before actual timing violations occur, thus maintaining reliability while minimizing productivity loss.
Solution Approach 2:
The sensor creates a feedback loop that continuously monitors the timing margin and provides real-time information about the relationship between critical path delay and clock period. This feedback enables dynamic adjustment of clock frequency based on actual timing conditions, optimizing the balance between reliability and productivity.
2Reliability
If the response time to timing violations is reduced, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The timing margin sensor uses a simplified copy or model of the critical path logic (using equivalent delay elements) to predict and detect timing violations. Instead of monitoring the entire complex critical path, the sensor creates a representative model that captures the essential timing behavior, reducing detection complexity while maintaining accuracy.
Solution Approach 2:
The sensor introduces an intermediary detection mechanism that indirectly measures timing margin by comparing a known delay (from the delay circuit) with the clock period. This intermediary approach avoids direct complex monitoring of the critical path while still providing accurate timing violation detection.
Data Source
AI summary
A timing margin sensor includes a delay circuit to generate a calibrated delay that corresponds to a known delay value of a logic circuit. Circuitry locks a first delay produced by the delay circuit to a clock period of a clock signal that is associated with the known delay value. A programmable selector adjusts the first delay to generate the calibrated delay, the calibrated delay including a timing margin component. Circuitry detects a change in supply voltage provided to the logic circuit based on a detected change in the calibrated delay. Clock adjustment circuitry selectively changes the clock period based on the detected change in the calibrated delay.