Input Buffer Enable Timing for Accurate DFE Data Capture
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Solution Overview
Problem
High-speed memory devices face data errors due to distortion and misalignment of clock and data signals, leading to inaccurate data capture and compromised distortion correction operations in decision feedback equalizer (DFE) circuits.
Innovation Solution
Implementing input buffer enable circuitry and receiver enable circuitry to align enable signals with data strobe (DQS) signals, ensuring accurate data capture and reducing the likelihood of incorrect data latching, thereby improving the efficiency and accuracy of distortion correction operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the operational rate of memory devices is increased to improve productivity, then data transmission speed improves, but data errors due to signal distortion and misalignment increase
Solution Approach 1:
The patent applies preliminary action by resetting the DQS signal to a default voltage value before data transmission begins, and by selectively enabling the input buffer only after the DQS signal is properly reset. This preparatory timing ensures that the signal path is clean and ready for accurate data capture at high speeds, preventing distortion-related errors before they occur.
Solution Approach 2:
The patent implements feedback through the decision feedback equalizer (DFE) circuit that continuously monitors received data quality and adjusts equalization parameters accordingly. The DFE uses previously received data to compensate for inter-symbol interference and signal distortion, dynamically adapting to maintain data accuracy even at increased operational rates.
2Ease of operation
If clock signals and enable signals are misaligned to simplify timing control, then device operation becomes easier, but data capture accuracy deteriorates
Solution Approach 1:
The patent uses preliminary action by resetting the DQS signal to a known default voltage value before enabling the input buffer to capture data. This ensures proper signal initialization and alignment between clock and data signals, preventing misalignment errors while maintaining straightforward timing control through the reset mechanism.
3Productivity
If the input buffer is enabled before the DQS signal is reset, then data processing speed improves, but incorrect data latching occurs
Solution Approach 1:
The patent applies preliminary action by resetting the DQS signal to a default voltage value before enabling the input buffer. This sequencing ensures that the signal path is properly initialized and stable before data capture begins, preventing incorrect latching while maintaining efficient data processing throughput.
Solution Approach 2:
The patent implements feedback through the DFE circuit that monitors data quality and can trigger buffer enabling based on signal conditions. The system uses feedback from signal quality detection to determine the optimal moment to enable the input buffer, ensuring both accuracy and speed.
Data Source
AI summary
Systems and methods that may enable alignment of a receiver enable signal with one or more clocking signals. By aligning the receiver operations with the one or more clocking signals, a likelihood of a false or incorrect data capture may be reduced, which may improve operation of a memory system. Reducing a likelihood of incorrect data capture may increase an accuracy of a distortion correction operation of a decision feedback equalizer (DFE).