Memory Write Timing Adjustment via Phase Shift Feedback
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Solution Overview
Problem
In memory devices with synchronous interfaces, variations such as temperature and jitter cause attenuation of data and clock signals, leading to poor data recovery, especially as operating frequencies increase, requiring precise timing alignment for accurate data sampling.
Innovation Solution
A method and system that adjust the write timing in memory devices by using a reference signal with a phase shift of one-half unit interval to detect phase shifts and adjust the phase difference between the data signal and the write clock signal, ensuring proper alignment for data recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the operating frequency is increased to transmit data more rapidly, then the data transmission speed is improved, but the timing alignment precision deteriorates due to signal attenuation and jitter
Solution Approach 1:
The patent implements a feedback mechanism where the memory device detects the phase of the reference signal and communicates timing adjustment information back to the processing unit. The processing unit then adjusts the phase of the write clock signal based on this feedback, creating a closed-loop system that maintains timing precision despite increased operating frequencies and signal attenuation.
Solution Approach 2:
The patent introduces a reference signal as an intermediary between the data signal and the write clock signal. This reference signal, which is phase-shifted by one-half unit interval, serves as a mediator to detect timing deviations and enable precise synchronization without directly interfering with the data transmission path.
2Reliability
If the write timing is adjusted to compensate for phase shifts, then the data recovery accuracy is improved, but the system complexity increases due to additional phase detection and adjustment mechanisms
Solution Approach 1:
The memory device performs self-service by autonomously detecting the phase of the reference signal and determining the required timing adjustment. The memory device generates and transmits timing adjustment information back to the processing unit, enabling the system to self-correct timing deviations without requiring complex external control mechanisms.
Solution Approach 2:
The patent adjusts the phase parameter of the write clock signal dynamically based on detected timing deviations. By changing the phase parameter in response to feedback information, the system maintains optimal data recovery accuracy without requiring complete redesign of the timing control architecture.
Data Source
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AI summary
A method and system are provided for adjusting a write timing in a memory device. For instance, the method can include receiving a data signal, a write clock signal, and a reference signal. The method can also include detecting a phase shift in the reference signal over time. The phase shift of the reference signal can be used to adjust a phase difference between the data signal and the write clock signal, where the memory device recovers data from the data signal based on an adjusted write timing of the data signal and the write clock signal.