Semiconductor Memory Output Enable Signal Circuit Timing Stability
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Solution Overview
Problem
Conventional semiconductor memory apparatuses face malfunctions due to timing differences in the output enable signal and are unstable under Process, Voltage, and Temperature (PVT) fluctuations and clock frequency changes, affecting data output operations.
Innovation Solution
A circuit for generating an output enable signal in a semiconductor memory apparatus, comprising an interval setting unit that synchronizes and delays the burst length signal with a clock, and a signal generating unit that includes a flip-flop section to produce a stable output enable signal, ensuring synchronization with the clock and stability across PVT variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional output enable signal generation circuit is used, then the circuit structure is simple, but timing differences occur between the output enable signal and data output clock, causing malfunctions
Solution Approach 1:
The interval setting unit pre-calculates and sets the enable interval based on the burst length signal before the actual data output operation. This preliminary setup ensures that the output enable signal is properly synchronized with the data output clock from the beginning, preventing timing malfunctions without requiring complex real-time adjustment circuits.
Solution Approach 2:
The patent introduces an interval setting unit as an intermediary component between the burst length signal and the output enable signal generation. This unit acts as a mediator that processes the burst length signal and generates appropriately timed interval setting signals, which then control the output enable signal timing, ensuring synchronization without direct complex interaction between all components.
2Reliability
If the output enable signal timing is not stabilized, then the circuit operation is fast, but the system becomes unstable under PVT fluctuations and clock frequency changes
Solution Approach 1:
The signal generating unit uses the interval setting signal as a feedback mechanism to continuously adjust and maintain the output enable signal timing. By monitoring the interval setting signal derived from the clock-synchronized burst length signal, the circuit can compensate for PVT fluctuations and clock frequency changes, maintaining stable timing without sacrificing operational speed.
Solution Approach 2:
The patent dynamically adjusts the enable interval parameter based on the burst length signal and clock frequency. The interval setting unit modifies the timing parameters of the output enable signal in response to changing operating conditions, allowing the system to maintain stability under PVT fluctuations and clock frequency changes while preserving fast operation.
3Reliability
If the enable interval of the output enable signal is not fixed, then the circuit is flexible, but timing differences cause malfunctions during data output
Solution Approach 1:
The patent implements a dynamic enable interval setting mechanism where the interval setting unit adjusts the output enable signal duration based on the burst length signal. This allows the enable interval to be flexible and adaptive to different data output requirements while maintaining consistent timing synchronization through clock-based control, resolving the contradiction between timing consistency and flexibility.
Data Source
AI summary
A circuit for generating an output enable signal in a semiconductor memory apparatus which can include an interval setting unit capable of delaying a burst length signal in synchronized with a clock, thereby generating an interval setting signal, and a signal generating unit for generating an output enable signal in response to a read command signal and the interval setting signal.