Clock Generation Reconfiguration for Error-Free Frequency Switching
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Solution Overview
Problem
In multi-processor systems, managing power consumption and clock distribution efficiently is challenging due to the high number of processors, varying demand for computation, and the need for flexible clock frequency configurations to conserve energy while maintaining system performance.
Innovation Solution
A method for reconfiguring clock generation circuitry in a synchronous digital system, allowing for seamless switching between clock signals without inducing errors, including using a phase-locked loop (PLL) and on-chip oscillators to generate and select primary clock signals based on system conditions, such as tampering or clock loss, and dynamically adjusting power consumption by changing target frequencies or powering down components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the system switches to a reduced clock frequency to conserve power, then power consumption is reduced, but system response time and performance deteriorate
Solution Approach 1:
The system dynamically adjusts clock frequency based on workload conditions, switching between high and low frequencies. The clock control circuit monitors system state and automatically selects appropriate frequency levels, enabling the system to adapt its performance and power consumption in real-time according to actual computational demands.
Solution Approach 2:
The system changes the clock frequency parameter from a fixed value to a variable one that can be adjusted between multiple discrete levels. By modifying this key operational parameter based on system state, the patent enables flexible trade-offs between power consumption and performance without requiring hardware redesign.
2Adaptability or versatility
If the system uses multiple power-down modes with different timeout levels, then power management flexibility is improved, but system complexity increases
Solution Approach 1:
The power management system is segmented into distinct operational modes (active, reduced frequency, power-down with different timeout levels). Each mode is independently defined and controlled, allowing the system to transition between well-defined states. This segmentation makes the complex power management behavior manageable through clear state transitions and associated timeout mechanisms.
Solution Approach 2:
The system pre-configures multiple power-down modes with predetermined timeout values and transition behaviors. By establishing these power management states and their associated timing parameters in advance, the system avoids the need for complex real-time decision logic during operation, simplifying control while maintaining flexibility.
3Use of energy by moving object
If the clock generation circuitry is reconfigured dynamically to change frequency, then power consumption can be optimized, but clock-induced errors may occur during transition
Solution Approach 1:
Before switching between clock frequencies, the system performs preliminary configuration of the clock generation circuitry. The new frequency settings are prepared and validated in advance, ensuring that transitions occur smoothly without generating spurious clock signals or timing errors. This preliminary setup prevents disruption to the synchronized digital system.
Solution Approach 2:
The clock generation circuitry includes intermediary control logic that manages the transition between different frequency settings. This intermediary mechanism coordinates the frequency change process, ensuring that the clock signal remains stable and synchronized throughout the transition, preventing clock-induced errors in the digital system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables efficient power management, reduces clock-induced errors, and ensures continuous operation by stabilizing clock generation circuitry before reverting to the original clock signal, thereby optimizing energy usage and system reliability.
Implementation Method 1
using a phase-locked loop (PLL) and on-chip oscillators to generate and select primary clock signals
Data Source
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AI summary
Embodiments of a synchronous digital system are disclosed that may include generation of clock and synchronization signals. Any of a plurality of available clock signals may be selected for use as a primary clock, without causing clock-induced errors in the synchronous digital system. The clock signals may be selected automatically or programmatically. Clock generation circuitry may generate a clock signal that is initially used as the primary clock. The clock generation circuitry may be dynamically reconfigured without interrupting operation of the synchronous digital system, by first selecting another of the available clock signals for use as the primary clock.