Memory Controller Busy Table Chip Enable Signal Control
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Solution Overview
Problem
Current memory systems face challenges in reducing power consumption while maintaining operational performance, particularly in managing busy times during read, write, and erasing operations in nonvolatile memory systems.
Innovation Solution
A memory system that includes a nonvolatile memory and a memory controller, which stores and updates a busy table to control the chip enable signal based on measured busy times, optimizing power usage and preventing performance deterioration by dynamically adjusting the chip enable signal according to the busy state of the nonvolatile memory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the chip enable signal is continuously maintained to ensure memory operation availability, then operational reliability is improved, but power consumption increases
Solution Approach 1:
The chip enable signal is dynamically adjusted based on the busy table status. When the memory device is busy (indicated by the busy table), the chip enable signal is deactivated to save power. When the memory device is ready, the chip enable signal is activated to ensure operational availability. This dynamic control resolves the contradiction between continuous availability and power consumption.
Solution Approach 2:
The system uses a busy table that provides feedback about the memory device's operational state. The memory controller continuously monitors the busy table and adjusts the chip enable signal accordingly. This feedback mechanism ensures that the chip enable signal is only active when the memory device is ready to operate, thereby reducing power consumption while maintaining reliability.
2Use of energy by moving object
If the chip enable signal is deactivated during busy periods to reduce power consumption, then energy efficiency is improved, but operational performance may deteriorate
Solution Approach 1:
The busy table is updated in advance to reflect the memory device's busy status before actual operations complete. This allows the memory controller to proactively deactivate the chip enable signal during known busy periods, ensuring power savings without impacting operational performance. The preliminary action of updating the busy table enables timely signal deactivation.
3Measurement precision
If busy time measurement is made more precise to optimize chip enable signal control, then power management accuracy is improved, but system complexity increases
Solution Approach 1:
The memory device autonomously maintains and updates the busy table with accurate busy time information without requiring complex external measurement systems. The memory controller simply reads the busy table to determine when to activate or deactivate the chip enable signal. This self-service approach achieves precise busy time measurement while keeping the overall system complexity low.
Data Source
AI summary
A memory system includes a nonvolatile memory, and a memory controller configured to control the nonvolatile memory. The nonvolatile memory stores a busy table. The memory controller loads the busy table and controls a chip enable signal for the nonvolatile memory based on the busy table.