Memory EDC Pattern Timing for Temperature Compensation
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Solution Overview
Problem
Memory devices, such as DDR SDRAM, face challenges in temperature compensation and power reduction, particularly in maintaining data integrity and efficiency during read and write operations due to temperature variations and signal distortion.
Innovation Solution
A memory device and control unit that generate a periodic Error Detection and Correction (EDC) pattern signal, incorporating a mode register, EDC pattern generator, and synchronizer to synchronize clock signals with EDC patterns, minimizing power consumption and correcting data errors through cyclic redundancy checks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If continuous EDC pattern signal is generated for temperature compensation, then temperature compensation effect is improved, but power consumption increases
Solution Approach 1:
The EDC pattern signal is generated periodically rather than continuously. The signal alternates between active periods (where EDC pattern is output for temperature compensation) and hold periods (where signal is disabled to save power). This periodic generation maintains temperature compensation effectiveness while significantly reducing power consumption during hold periods.
Solution Approach 2:
The EDC pattern generator dynamically adjusts its operation between active and disabled states based on timing signals. The generator is enabled during active periods to provide temperature compensation and disabled during hold periods to reduce power consumption, creating a dynamic power management system that adapts to operational requirements.
2Reliability
If EDC pattern signal toggling is increased for better error detection, then error detection capability is improved, but power consumption increases
Solution Approach 1:
The EDC pattern signal is activated periodically rather than continuously. During active periods, the signal toggles to provide error detection capability. During hold periods, the signal is disabled, reducing both toggling and power consumption. This periodic activation maintains error detection effectiveness while minimizing power usage.
Solution Approach 2:
Instead of continuous EDC pattern generation, the system applies partial action by enabling the EDC pattern only during necessary active periods. This partial activation provides sufficient error detection capability for maintaining reliability while avoiding the excessive power consumption that would result from continuous operation.
3Speed
If clock signal frequency is increased for faster data transmission, then transmission speed is improved, but signal distortion increases
Solution Approach 1:
The EDC pattern signal serves as a feedback mechanism for clock synchronization. By comparing the EDC pattern signal with the clock signal, the system can detect and correct timing deviations caused by signal distortion. This feedback loop enables the system to maintain accurate synchronization even at higher transmission speeds where distortion is more prevalent.
Solution Approach 2:
The system changes the parameters of the EDC pattern signal, specifically its periodicity and duty cycle, to optimize performance. By adjusting when the signal is active versus held, the system can accommodate higher transmission speeds while managing signal distortion effects through improved synchronization capability.
Data Source
AI summary
A memory device is configured to generate a signal having a temperature compensation function. The device includes a mode register configured to store error detection and correction (EDC) mode data, and an EDC pattern generator configured to receive pattern information and period information included in the mode data and to generate an EDC pattern signal based on the pattern information and the period information. The EDC pattern signal is a periodic signal obtained by repeating a signal pattern based on the pattern information at a periodic rate corresponding to a signal period based on the period information. In some cases, the EDC pattern signal may be disabled during a portion of the signal period.