Controlled FPGA Clock Transition for Voltage Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Integrated circuits with programmable logic circuitry, such as FPGAs, experience significant current-resistance (IR) drops during transitions from configuration to user mode due to inrush currents, leading to inefficiencies and potential damage, which are compensated for with guardbands that hinder performance and increase design costs.
Innovation Solution
Gradually ramping the clock frequency from configuration to user mode using phase-locked loops or digitally-locked loops to reduce inrush currents and IR drops, allowing for reduced guardbands and optimized performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the FPGA circuitry transitions directly from configuration mode to user mode, then the transition speed is fast, but an inrush current occurs causing voltage drop and requiring guardbands that reduce performance
Solution Approach 1:
The patent applies dynamics by making the clock frequency adjustable and time-dependent. The clock frequency is dynamically changed from a first frequency in configuration mode to a second frequency in user mode, allowing the system to adapt its operating characteristics over time. This dynamic adjustment enables fast transitions while managing inrush current effects through controlled frequency changes rather than abrupt mode switching.
2Reliability
If guardbands are designed to accommodate inrush current and IR drop, then the circuit can operate safely, but FPGA circuitry performance is affected and space constraints are tightened
Solution Approach 1:
The patent applies parameter changes by modifying the clock frequency parameter during mode transition. By changing the clock frequency from a first frequency to a second frequency, the system alters its operational parameters to manage inrush current and IR drop effects. This allows the circuit to operate safely without requiring conservative guardbands, thereby maintaining higher FPGA performance and looser space constraints.
3Reliability
If the clock frequency is ramped gradually from configuration to user mode, then inrush currents and IR drops are reduced, but the transition takes more time
Solution Approach 1:
The patent applies dynamics by implementing a dynamic clock frequency adjustment mechanism. Rather than a static frequency change, the system dynamically ramps the clock frequency from a first frequency to a second frequency during the mode transition. This dynamic approach manages inrush currents and IR drops effectively while minimizing the transition time through optimized frequency ramping profiles.
Data Source
AI summary
Systems or methods of the present disclosure may provide for gradually adjusting a frequency of a clock signal. When transitioning from a configuration mode to a user mode, a clock of an integrated circuit (e.g., a field-programmable gate array or FPGA) may quickly (e.g., instantaneously) switch from a low configuration mode frequency to a high user mode frequency. This rapid increase in clock frequency may cause an inrush current and corresponding current-resistance voltage (IR) drop. To reduce or avoid the inrush current and IR drop, a frequency of the clock may be gradually ramped up from the configuration mode frequency to the user mode frequency.