Mode-Aware Data Output Circuit for Trigger Signal Retention
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Solution Overview
Problem
Existing data output circuits in semiconductor memory apparatuses face challenges in efficiently managing data output modes, particularly in volatile memory systems where data retention requires precise control of trigger signals and clock signals, and in nonvolatile systems where specific modes like write leveling, connectivity test, and read preamble training demand distinct operational states.
Innovation Solution
A data output circuit design that includes trigger units, a signal generation unit, and a mode detecting section, allowing for the output of data in response to trigger signals and control signals in both normal and specific operational modes, with the signal generation unit retaining trigger signals in enabled or disabled states based on mode signals, enabling efficient data output across various modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional data output circuit is used in volatile memory systems, then data can be output during normal operation, but the circuit cannot retain trigger signals during power absence, limiting its applicability in power-constrained environments
Solution Approach 1:
The circuit dynamically changes its behavior based on the operational mode. In normal mode, it operates as a conventional data output circuit. In test mode, it dynamically retains trigger signals during power absence, enabling the same circuit to adapt to different operational requirements and maintain reliability across various conditions
Solution Approach 2:
The circuit changes its operational parameters based on the mode signal. When in test mode, it alters its signal retention characteristics to maintain trigger signals during power absence, thereby achieving versatility across different operational scenarios while maintaining reliability in each specific mode
2Adaptability or versatility
If the circuit retains trigger signals during power absence to support volatile memory systems, then adaptability to power-constrained environments improves, but circuit complexity increases due to additional mode detection and signal retention mechanisms
Solution Approach 1:
The data output circuit is designed to perform multiple functions: normal data output operation and test mode operation with power absence support. By integrating mode detection and conditional signal retention capabilities into the existing circuit architecture, it achieves multi-functionality without requiring entirely separate circuits for different operational modes
Solution Approach 2:
The circuit preliminarily detects the operational mode through the mode signal before power absence occurs. This preliminary detection allows the circuit to prepare and activate the appropriate signal retention mechanism in advance, enabling seamless transition to power-constrained operation without adding excessive complexity during the actual power absence event
Data Source
AI summary
A data output circuit includes a first trigger unit and a signal generation unit. The first trigger unit is inputted with first data in a first mode and a second mode, and outputs the first data in response to a first trigger signal. The signal generation unit, in the first mode, outputs the first trigger signal in response to a first clock signal, and, in the second mode, retains the first trigger signal in a first state regardless of the first clock signal.