Memory Controller Idle Mode Power Optimization
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Solution Overview
Problem
Dynamic operating conditions in electronic devices, such as changing clock frequencies, often lead to data corruption and increased latency due to complex integrated circuitry, particularly in systems like SOC, where memory controllers for DDR DRAM may not support dynamic changes, limiting the ability to reduce power consumption effectively.
Innovation Solution
An apparatus and method for dynamically modifying operating conditions of a memory controller, including entering an idle mode to optimize power consumption, which involves preparing the memory controller and memory for modification, denying access during the change, and reinstating access under the new conditions, using a power and clock control module to manage these transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If dynamic operating conditions are implemented to reduce power consumption, then power consumption is reduced, but data corruption and increased latency occur
Solution Approach 1:
The patent applies preliminary action by preparing the memory controller and memory for dynamic condition changes before actually modifying operating parameters. This includes flushing pending transactions, stopping DMA channels, and ensuring all components are ready to withstand the transition, thereby preventing data corruption during frequency changes or power adjustments
Solution Approach 2:
The patent introduces an intermediary mechanism that coordinates between different system components during dynamic transitions. This mediator ensures proper synchronization between memory controller, DMA channels, processors, and other SOC components, preventing race conditions and data corruption during operating condition changes
2Loss of energy
If dynamic operating conditions are changed to optimize performance, then power consumption is reduced, but latency increases due to coordination requirements
Solution Approach 1:
The patent reduces latency by performing preliminary actions before dynamic transitions - flushing transaction buffers, stopping pending DMA operations, and preparing all components in advance. This eliminates the need for lengthy coordination during the transition itself, thereby reducing overall latency while still achieving power savings
Solution Approach 2:
The patent maintains continuity of useful action by ensuring that memory operations are either completed before transitions or properly queued and resumed after transitions. This keeps the system productive during dynamic changes rather than creating complete stoppages, thereby reducing latency while achieving power optimization
3Adaptability or versatility
If multiple components access memory during operating condition changes, then system functionality is maintained, but software complexity and coordination difficulty increase
Solution Approach 1:
The patent applies segmentation by dividing the system into distinct components (memory controller, DMA channels, processors, hardware accelerators) and managing each independently during transitions. This modular approach simplifies software complexity by allowing each component to be controlled separately through standardized interfaces rather than requiring complex coordinated control
Solution Approach 2:
The patent introduces intermediary control mechanisms that simplify coordination between multiple components during dynamic transitions. These intermediaries provide standardized protocols for components to interact during frequency changes or power adjustments, reducing software complexity while maintaining full system functionality
Data Source
AI summary
An apparatus and method for dynamically modifying one or more operating conditions of a memory controller in an electronic device. Operating conditions may comprise clock frequency and power, which may be modified or removed. Dynamic modification of operating conditions may be done for purposes of optimizing a parameter, such as power consumption. A mode, referred to as idle mode, may be used as a transitional or operational mode for the memory controller. The performance of the memory controller may dynamically vary in response to changes in its operating conditions. As such, the memory controller may comprise multiple modes, or submodes, of operation. The performance of the memory controller may depend on the type of memory it controls, for instance Double Data Rate (DDR) Dynamic Random Access Memory (DRAM).