Flag Signal Circuit for Temperature-Adaptive Memory Refresh
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Solution Overview
Problem
Semiconductor devices in mobile devices face challenges in efficiently managing internal temperature changes, which affect data retention and power consumption, as existing technologies do not effectively extract and utilize temperature-related information to adjust refresh periods.
Innovation Solution
A flag signal generation circuit that includes periodic signal detection units and a flag signal output unit, which generate and buffer a flag signal based on changes in periodic signals related to internal temperature, allowing for dynamic adjustment of refresh periods and power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the refresh period is fixed regardless of temperature, then the circuit design is simple, but data retention reliability deteriorates at high temperatures
Solution Approach 1:
The patent extracts temperature information from the periodic signal characteristics and separates it from the main refresh control logic. By detecting changes in periodic signal levels and generating a dedicated flag signal that indicates temperature-related refresh period changes, the system isolates temperature compensation functionality into a distinct detection and signaling mechanism, thereby improving data retention without significantly complicating the overall refresh control architecture.
Solution Approach 2:
The patent implements a feedback mechanism where the flag signal generation circuit continuously monitors periodic signal levels and generates flag signals that feedback to the refresh control logic. This feedback loop enables the system to automatically adjust refresh periods based on detected temperature changes, ensuring data retention reliability while maintaining a relatively simple circuit design through automated temperature-compensated refresh control.
2Use of energy by moving object
If power consumption is reduced for portability, then battery life improves, but data retention at high temperatures deteriorates
Solution Approach 1:
The patent implements dynamic refresh period adjustment based on detected temperature changes. The flag signal generation circuit enables the system to transition from fixed refresh periods to dynamically adapted refresh periods that respond to actual operating conditions. This dynamic approach allows the system to maintain data retention reliability at high temperatures while avoiding unnecessary refresh operations at normal temperatures, thereby optimizing power consumption for improved battery life in portable devices.
Solution Approach 2:
The patent changes the refresh period parameter based on temperature conditions detected through periodic signal analysis. By modifying the refresh period parameter dynamically - extending it when temperature increases are detected and maintaining normal values when temperatures are stable - the system achieves both power consumption reduction and reliable data retention across varying thermal conditions.
3Adaptability or versatility
If temperature information is not extracted from periodic signals, then the circuit design is simple, but adaptive refresh control is impossible
Solution Approach 1:
The patent makes the flag signal generation circuit serve multiple functions: it detects temperature-related changes in periodic signals, generates appropriate flag signals for refresh control, and provides adaptive refresh period adjustment capability. This multi-functional approach enables refresh period adaptation without requiring separate dedicated temperature sensing and control circuits, thereby achieving adaptability while limiting the increase in device complexity.
Data Source
AI summary
A flag signal generation circuit includes a first periodic signal detection unit, a second periodic signal detection unit, and a flag signal output unit. The first periodic signal detection unit is configured to detect a change in a level of a first periodic signal and generate a first detection signal. The second periodic signal detection unit is configured to detect a change in a level of a second periodic signal and generate a second detection signal. The flag signal output unit is configured to generate a pre-flag signal from the first and second detection signals, buffer the pre-flag signal in response to a mode register read signal, and output the buffered pre-flag signal as a flag signal.