Adaptive clock tree rebalancing system using real-time timing feedback in SoC

Abstract

An adaptive clock tree balancing system using real-time timing feedback in a system-on-chip (SoC), comprising: a real-time timing feedback module configured to collect operating timing data from distributed sensors within the SoC clock distribution network; a skew detection and analysis module configured to identify clock skew imbalances by comparing the collected timing data with target synchronization points; a clock tree balancing control module configured to determine corrective actions to balance the clock tree based on the identified skew imbalances; an adaptive delay adjustment module configured to implement the corrective actions by adjusting programmable delay elements or routing paths; a configuration and management module configured to store base profiles, tuning parameters and adaptation logs; an integration and interface module configured to communicate timing data and adjustment commands with other SoC subsystems; and a verification and validation module configured to confirm the effectiveness of the compensatory measures, where the system dynamically maintains clock synchronization under changing process, voltage, temperature, and workload conditions.

Description

[0001] The present invention relates to the field of integrated circuit and semiconductor design, particularly clock distribution networks in system-on-chip (SoC) architectures. It addresses techniques for dynamically adapting and balancing the clock tree using real-time timing feedback during design or operation. The invention aims to improve timing closure, reduce clock skew, and increase the overall performance and reliability of SoC designs.

[0002] In modern system-on-chip (SoC) architectures, clock distribution plays a critical role in the synchronous operation of millions of interconnected components. The clock tree is responsible for delivering the clock signal to various functional blocks with minimal distortion and jitter. However, as process geometries shrink and operating frequencies increase, achieving balanced clock distribution becomes increasingly difficult. Manufacturing variances, temperature fluctuations, and dynamic workload changes can lead to clock distortion, which directly impacts performance and reliability. Traditional clock tree synthesis methods are typically static, developed in the early stages of implementation, and unable to adapt to timing changes that occur during operation or under changing environmental conditions.

[0003] The static nature of traditional clock tree designs often leads to performance bottlenecks, timing violations, or unnecessary overdesign to compensate for worst-case scenarios. Designers can insert additional buffers or modify routing to compensate for delays, but these adjustments are based on pre-silicon fabrication estimates rather than real-time operating data. As a result, the implemented clock network may not optimally match actual operating conditions, leading to inefficiencies such as increased power consumption, degraded performance margins, and reduced yield. Furthermore, as SoC designs become increasingly complex, manual rebalancing becomes impractical and time-consuming, further delaying product development cycles.

[0004] The present invention addresses these limitations by introducing an adaptive clock tree rebalancing system that leverages real-time timing feedback to dynamically adjust the clock distribution within an SoC. By continuously monitoring timing characteristics during design validation or field operation, the system can detect skew imbalances and automatically reconfigure the clock paths to restore balance. This adaptive approach not only ensures consistent performance under changing conditions but also reduces the need for extensive pre-silicon margining. Thus, the invention provides a proactive, automated, and efficient solution to one of the most persistent challenges in high-performance SoC design.

[0005] An object of the present disclosure is to provide a dynamic clock tree balancing mechanism that adapts to real-time timing variations in SoC designs.

[0006] Another objective of the present disclosure is to reduce clock skew and jitter, thereby improving synchronization within the SoC.

[0007] Another objective of the present disclosure is to minimize power consumption by avoiding over-sizing and excessive buffering in clock distribution.

[0008] Another objective of the present disclosure is to improve the performance and reliability of the chip under different process, voltage, temperature and workload conditions.

[0009] Another object of the present disclosure is to enable automatic clock adjustment without the need for manual intervention or lengthy redesign cycles.

[0010] Another objective of the present disclosure is to reduce the complexity of timing closure during design and post-silicon validation.

[0011] Another objective of the present disclosure is to ensure compatibility with existing SoC architectures through modular integration.

[0012] Another objective of the present disclosure is to maintain traceability and optimization history through comprehensive logging and configuration management.

[0013] Further objects and advantages of the present disclosure will become more apparent from the following description, which is not intended to limit the scope of the present disclosure.

[0014] The present invention relates to an adaptive clock tree rebalancing system for system-on-chip (SoC) designs that uses real-time timing feedback to dynamically correct clock skew and maintain synchronization.

[0015] Another embodiment of the present invention is the real-time timing feedback module that collects operating clock data such as skew, jitter, and delay from embedded sensors.

[0016] Another embodiment of the present invention is the skew detection and analysis module, which processes the acquired timing data to detect and quantify skew imbalances.

[0017] Another embodiment of the present invention is the clock tree rebalancing control module, which determines and outputs corrective actions to restore a balanced clock distribution.

[0018] Another embodiment of the present invention is the adaptive delay adjustment module, which performs fine-tuned optimization through programmable delay elements or adjustable buffers.

[0019] Another embodiment of the present invention is the configuration and management module, which manages configuration profiles, optimization parameters and adaptation logs for traceability.

[0020] Another embodiment of the present invention is the integration and interface module, which enables communication with other SoC subsystems and external debugging tools.

[0021] Another embodiment of the present invention is the verification and validation module, which ensures that all adaptations meet the performance and reliability requirements without causing new timing problems.

[0022] The present invention relates to an adaptive clock tree rebalancing system designed for system-on-chip (SoC) architectures to dynamically maintain clock synchronization under changing operating conditions. The system comprises seven key modules: a real-time timing feedback module for collecting live clock performance data, a skew error detection and analysis module for identifying imbalances, and a clock tree rebalancing control module for determining corrective actions. An adaptive delay adjustment module makes precise timing changes, while a configuration and management module stores profiles and tuning logs. An integration and interface module ensures seamless communication with other SoC subsystems, and a verification and validation module confirms the effectiveness of the adjustments.Together, these modules enable continuous, automated optimization of the SoC clock network for improved performance and reliability. Real-time timing feedback module

[0023] This module continuously monitors the timing characteristics of the SoC's clock distribution network during design validation or runtime operation. It collects data on parameters such as clock skew, jitter, propagation delay, and setup / hold violations from distributed sensors or embedded timing monitors. The collected feedback is processed in real time to reflect the actual operating state of the chip, allowing any deviation from ideal timing to be immediately detected. Module for detecting and analyzing skew errors

[0024] Once timing feedback is available, this module analyzes the data to identify skew imbalances in the branches of the clock tree. It uses statistical and algorithmic analysis techniques to compare the actual arrival times at various clock sinks with the target synchronization points. Advanced diagnostic algorithms can distinguish between transient fluctuations and persistent skew problems, prioritizing them based on their impact on system performance. Module for controlling the realignment of the clock tree

[0025] This module acts as the system's decision engine. Based on skew analysis, it determines the optimal realignment strategy for the affected clock branches. It generates reconfiguration commands such as adjusting buffer delays, modifying routing paths, or enabling / disabling specific tuning circuits. The control logic ensures that all adjustments maintain the integrity of the clock domain relationships without causing additional timing violations. Adaptive delay adjustment module

[0026] This module implements the actual physical changes to the clock network by fine-tuning the delays in specific branches. Techniques include programmable delay lines, digitally controlled delay elements, or buffers with variable drive strength. The adjustments are made gradually to minimize noise, with real-time verification confirming the improvement in skew balance. This adaptive tuning ensures that the clock tree remains aligned even under changing workloads and environmental conditions. Configuration and management module

[0027] This module manages the configuration data for all tunable elements in the clock tree. It stores base clock distribution profiles, real-time tuning parameters, and historical tuning logs. The module supports both automatic and manual configuration modes, allowing engineers to intervene during debugging or testing. It also ensures that tuning actions are logged for traceability and future optimization. Integration and interface module

[0028] This module enables communication between the adaptive rebalancing system and other SoC subsystems, such as power monitoring units, energy management controllers, or external debugging tools. It supports standard communication protocols to enable seamless integration into existing SoC design and runtime environments. External software programs can use the interface to query real-time timing data or issue custom rebalancing commands. Verification and validation module

[0029] After adjustments, this module verifies whether the rebalancing measures have successfully restored the clock without affecting other timing paths. It performs post-adjustment validation routines, including simulations, in-system testing, and statistical monitoring. Continuous validation ensures that the system maintains optimal clock distribution across different operating scenarios, thereby improving long-term reliability and performance stability.

[0030] The invention is explained again below with reference to the figure. It shows: Fig. an adaptive system for rebalancing the clock tree structure (100) using real-time timing feedback in SoC

[0031] The adaptive clock tree rebalancing system (100) continuously monitors and analyzes the timing characteristics of the clock distribution network within a system-on-chip (SoC). The process begins with the real-time timing feedback module, which collects live data on clock signal skews, jitter, and propagation delays from embedded sensors or timing monitors strategically distributed throughout the SoC. This data is passed to the skew detection and analysis module, where advanced algorithms identify timing mismatches and determine their severity. The clock tree rebalancing control module processes this analysis and formulates a rebalancing strategy, deciding whether to adjust delays, reroute signals, or enable tuning elements.These instructions are executed by the adaptive delay adjustment module, which makes precise, incremental changes to programmable delay lines or clock buffers, ensuring minimal noise while improving synchronization.

[0032] After rebalancing, the Configuration and Management module updates the profiles stored in the system and logs all changes for traceability and future optimization. The Integration and Interface module ensures seamless communication between the rebalancing system and other SoC components, allowing performance monitoring units, power controllers, or debugging tools to access live timing data and adjustments. Finally, the Verification and Validation module confirms that the changes have resolved skew issues without causing new timing violations by performing simulations and real-time tests to validate the effectiveness of the changes.Through this continuous feedback control validation cycle, the system adapts to process variations, temperature fluctuations and workload changes, ensuring stable, energy-efficient and high-performance clock distribution in complex SoC environments.

Claims

[1] An adaptive system for balancing clock trees using real-time timing feedback in system-on-chip (SoC), comprising: a real-time timing feedback module configured to collect operational timing data from distributed sensors within the SoC clock distribution network; a skew detection and analysis module configured to identify clock skew imbalances by comparing the collected timing data with target synchronization points; a clock tree balancing control module configured to determine corrective actions to balance the clock tree based on the identified skew imbalances; an adaptive delay adjustment module configured to implement corrective actions by adjusting programmable delay elements or routing paths; a configuration and management module configured to store basic profiles, tuning parameters, and customization logs; an integration and interface module configured to communicate timing data and adaptation commands with other SoC subsystems; and a verification and validation module configured to confirm the effectiveness of the compensatory measures, the system dynamically maintains clock synchronization under changing process, voltage, temperature and workload conditions. [2] System (100) according to claim 1, wherein the real-time timing feedback module comprises embedded hardware sensors capable of measuring clock arrival times, jitter and propagation delays at multiple clock sinks. [3] System (100) according to claim 1, wherein the skew detection and analysis module applies statistical filtering and threshold-based prioritization to distinguish between temporary and persistent skew problems. [4] System (100) according to claim 1, wherein the module for controlling the realignment of the clock tree uses an algorithmic decision engine configured to select from several realignment strategies, including delay optimization, buffer drive strength adjustment and clock path rerouting. [5] System (100) according to claim 1, wherein the adaptive delay adjustment module uses digitally controlled delay lines for finely graduated changes in clock time measurement. [6] System (100) according to claim 1, wherein the configuration and management module supports both automatic and manual configuration modes for clock tree tuning. [7] System (100) according to claim 1, wherein the integration and interface module communicates via standard SoC interconnection protocols to enable seamless integration with power monitoring and energy management subsystems. [8] System (100) according to claim 1, wherein the verification and validation module performs real-time validation tests and simulation-based readjustment analyses. [9] System (100) according to claim 1, wherein the system logs all time feedback, skew analysis results and adjustments for future optimizations and bug fixes. [10] System (100) according to claim 1, wherein the adaptive compensation process is performed periodically or in response to the detection of time deviations that exceed predefined thresholds.

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