Memory Command Decoder Hazard Control
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Solution Overview
Problem
Electronic devices face function failures due to unexpected command hazards when switching between operating modes, particularly at the boundary of transitions between internal and external command signals, leading to potential command hazards.
Innovation Solution
The implementation of a memory device with control logic circuits and multiplexers that manage external and internal command signals through mode registers, clock enable signals, and super low power flag signals to control the transition between sleep and operational modes, ensuring seamless switching and reducing command hazards by disabling the command decoder during transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the device switches between operating modes (internal and external command signals), then the device can operate flexibly in different modes, but command hazards occur at the transition boundary causing function failure
Solution Approach 1:
The command decoder is disabled in advance before the mode transition occurs and remains disabled for a predetermined time period after the transition. This preliminary action prevents unexpected commands from being decoded during the critical transition boundary, eliminating command hazards while maintaining mode switching flexibility
Solution Approach 2:
A mode register serves as an intermediary element that coordinates the transition between internal and external command modes. The mode register controls the timing of decoder disablement and ensures proper sequencing of mode changes, preventing command hazards during transitions
2Reliability
If the command decoder is disabled during mode transition, then command hazards are prevented, but the transition process takes additional time
Solution Approach 1:
The command decoder is disabled periodically during mode transitions according to a predetermined timing sequence. The decoder is disabled before the transition and re-enabled after a predetermined time period, creating a controlled periodic disablement pattern that prevents command hazards while minimizing transition time
Data Source
AI summary
Apparatus, systems, and methods are disclosed that operate within a memory to execute internal commands, to suspend the execution of commands during a transfer period, and to execute external commands following the transfer period. Additional apparatus, systems, and methods are disclosed.