Deterministic Interconnect Power Gating for Low-Latency MCU Access
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Solution Overview
Problem
Existing power-gating techniques in microcontroller units (MCUs) introduce latency and inefficiency by relying on hard-coded predictions of port usage, failing to account for real-time power requirements and leading to unnecessary power consumption.
Innovation Solution
Implementing clock control circuitry in MCUs to dynamically and deterministically manage power and clock signals based on real-time access requirements, predicting communication events and enabling ports before access occurs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If hard-coded power-gating techniques are used to conserve power in interconnect ports, then power consumption is reduced, but latency increases due to clock cycles required for initialization
Solution Approach 1:
The system performs preliminary actions by predicting future port access requirements and enabling clock signals to interconnect ports in advance before actual access occurs. This allows ports to be initialized proactively rather than reactively, reducing the latency penalty while maintaining power savings through selective gating.
Solution Approach 2:
The system dynamically adjusts power-gating behavior by continuously monitoring access patterns and adapting clock signal enablement decisions in real-time. This dynamic approach replaces static hard-coded power-gating with adaptive control that balances power consumption and latency based on actual runtime behavior.
2Speed
If hard-coded power-gating techniques allocate more power to frequently accessed ports, then access performance is improved, but overall power efficiency decreases due to inability to adapt to real-time variations
Solution Approach 1:
The system implements feedback mechanisms by monitoring actual port access patterns and using this information to adjust power-gating decisions. This closed-loop control enables the system to adapt to real-time variations in access requirements, maintaining high access performance while optimizing power efficiency based on actual usage rather than static predictions.
Solution Approach 2:
The system changes operational parameters dynamically by adjusting clock signal enablement states based on monitored access patterns. This allows the system to optimize the balance between access performance and power efficiency by adapting power allocation to actual runtime conditions rather than relying on fixed hard-coded configurations.
Data Source
AI summary
Various examples disclosed herein relate to deterministically controlling interconnect operations to provide dynamic power gating for a system. In an example, a microcontroller unit (MCU) is provided that includes a group of processing devices, a group of target resources, interconnect circuitry, and clock control circuitry. The interconnect circuitry connects the group of processing devices to the group of target resources. The clock control circuitry is coupled to the interconnect circuitry. The clock control circuitry is configured to identify an upcoming occurrence of a communication between a pair of devices comprised of one of the processing devices and one of the target resources, and prior to the occurrence of the communication, enable a clock associated with a path through the interconnect circuitry between the pair of devices.