Toggle-Based Power Management for IC Data Rate Limiting
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Solution Overview
Problem
Traditional power management techniques for integrated circuits often assume a worst-case scenario for data toggle activity, leading to overly conservative rate limiting that reduces performance unnecessarily, especially in scenarios with low data toggle activity.
Innovation Solution
The implementation of toggle detector circuitry that measures toggle activity and uses this information to make more nuanced rate limiting decisions, reducing or avoiding rate limiting when toggle rates are low, and adjusting power consumption estimates based on toggle rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If traditional worst-case rate limiting is applied, then power consumption is controlled, but performance is unnecessarily reduced
Solution Approach 1:
The patent applies dynamics by transitioning from static worst-case rate limiting to dynamic rate limiting based on real-time toggle activity monitoring. The system continuously measures actual data toggle rates and adjusts the data rate limit accordingly, allowing the limiter to adapt its behavior to current workload conditions rather than operating at a fixed conservative threshold throughout.
Solution Approach 2:
The patent implements feedback by introducing toggle activity monitoring that provides real-time information about actual data changes to the rate limiting mechanism. This feedback loop enables the system to observe actual toggle rates and use this information to make informed rate limiting decisions, correcting the lack of feedback in traditional worst-case approaches that operate blindly without knowledge of actual activity levels.
Solution Approach 3:
The patent applies parameter changes by modifying the rate limiting parameter (data rate limit) based on measured toggle activity. Instead of using a fixed worst-case parameter, the system dynamically changes the rate limit parameter in response to varying toggle rates, allowing optimization of both power consumption and performance across different operating conditions.
2Temperature
If conservative rate limiting is applied, then overheating is avoided, but unnecessary performance reduction occurs
Solution Approach 1:
The system transitions from static conservative temperature management to dynamic thermal management by continuously monitoring toggle activity and adjusting data rates in real-time. This allows the system to maintain safe operating temperatures only when actually needed based on measured activity levels, rather than applying continuous conservative limits.
Solution Approach 2:
The patent implements feedback by using toggle activity monitoring to provide information about actual power consumption patterns to the thermal management system. This feedback enables the system to make informed decisions about when thermal management is actually required, rather than operating under continuous conservative assumptions.
3Productivity
If toggle-based rate limiting is implemented, then performance improves, but device complexity increases
Solution Approach 1:
The patent introduces an intermediary toggle activity monitor that sits between the data bus and the rate limiting logic. This intermediary component captures toggle information and provides it to the rate limiting mechanism, enabling sophisticated performance optimization without requiring complex integration throughout the entire system.
Solution Approach 2:
The system applies self-service by enabling the rate limiting mechanism to autonomously adjust its behavior based on toggle activity information it receives from the monitor. The system serves itself by using its own operational data (toggle rates) to make intelligent rate limiting decisions without requiring external control.
Data Source
AI summary
Techniques are disclosed relating to data rate limiting based on toggle rate. In some embodiments, toggle detector circuitry determines a toggle rate between consecutive clock cycles for node circuitry that communicates via a data bus and provides toggle information to data rate limiter circuitry based on the determined toggle rate. The data rate limiter circuitry may limit data rate based on toggle information and the one or more limit inputs. Toggle detector circuitry may be configured to aggregate the toggle rate over multiple cycles using a rolling multi-cycle window, generate toggle information for windows of different lengths, generate toggle information for different data, or some combination thereof.