Input Buffer Circuit Clock Signal Validation Logic
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Solution Overview
Problem
Semiconductor memory devices may operate incorrectly due to noise-induced activation of the clock enable signal before the clock signal is properly input, leading to improper command execution.
Innovation Solution
An input buffer circuit comprising a logic unit, a clock enable buffer, and a clock buffer is introduced, where the logic unit generates a decision signal indicating whether the clock signal is normally input, and the clock enable buffer activates an internal clock enable signal only when the clock signal is correctly input, ensuring the clock buffer outputs an internal clock signal in synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the clock enable signal is activated before the clock signal is properly input, then the semiconductor memory device may operate according to an incorrect command, but the device complexity increases when adding validation logic
Solution Approach 1:
The logic unit performs preliminary validation of the clock signal before allowing the clock enable buffer to activate the internal clock enable signal. This preliminary action ensures that the clock signal is properly received and validated before the memory device begins operating, preventing incorrect command execution while maintaining a structured approach to signal validation.
Solution Approach 2:
The logic unit acts as an intermediary between the clock signal input and the clock enable buffer. It validates the clock signal and only allows passage to the buffer when validation succeeds, thereby preventing premature activation without requiring complex circuitry throughout the entire memory device.
2Reliability
If noise causes premature activation of the clock enable signal, then incorrect commands are executed, but adding validation logic increases the time required for signal processing
Solution Approach 1:
The logic unit performs a quick preliminary check of the clock signal characteristics (presence and validity) before enabling the clock enable buffer. This preliminary validation is designed to be fast and deterministic, adding minimal processing time while effectively preventing noise-induced premature activation.
Solution Approach 2:
The logic unit provides feedback control by monitoring the clock signal and only enabling the buffer when the signal is validated. This feedback mechanism ensures that the system responds appropriately to actual signal conditions without requiring excessive processing time or complex timing sequences.
Data Source
AI summary
An input buffer circuit includes a logic unit, a clock enable buffer, and a clock buffer. The logic unit is configured to receive a clock signal and a clock enable signal, and to output a decision signal indicative of whether the clock signal is normally input, where the decision signal is activated when the clock signal is normally input. The clock enable buffer is configured to buffer the clock enable signal and to activate an internal clock enable signal, in response to an activation of the decision signal. The clock buffer is configured to buffer the clock signal and to output an internal clock signal, in response to an activation of the internal clock enable signal.