Pulse Width Control for Reliable High-Speed Memory Signaling
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Solution Overview
Problem
Signal distortion between semiconductor memory devices and memory controllers leads to decreased data transmission speed and reliability due to varying line characteristics, making it difficult to secure an effective margin for data bit identification.
Innovation Solution
A pulse width controller adjusts the pulse width of data signals based on previous data bits, selectively increasing or decreasing the high or low duration of signal pulses to align rising and falling times with specific data patterns, thereby improving signal reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data is transmitted at high speed through signal lines, then productivity is improved, but signal distortion occurs causing decreased reliability
Solution Approach 1:
The patent applies preliminary action by adjusting the pulse width of data signals in advance based on predicted data patterns before transmission. The signal receiver modifies pulse widths proactively to prevent distortion effects, rather than correcting them after they occur. This allows high-speed transmission while maintaining reliability by pre-compensating for signal line characteristics.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the pulse width parameter of data signals based on data patterns and signal line characteristics. The signal receiver changes the temporal parameters (high duration and low duration) of transmitted signals to optimize both transmission speed and reliability, adapting to different transmission conditions.
2Reliability
If pulse width is adjusted based on data patterns, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by adjusting pulse width parameters specifically for different data patterns rather than uniformly for all data. The signal receiver identifies specific data patterns (e.g., consecutive identical bits) and applies targeted pulse width adjustments only where needed, improving reliability for critical patterns while keeping the system relatively simple.
Solution Approach 2:
The patent implements feedback by using previously received data bits to determine adjustments for current data bit transmission. The signal receiver monitors incoming data patterns and uses this feedback to dynamically adjust pulse widths, creating a closed-loop system that improves reliability through adaptive control without requiring complex external coordination.
Data Source
AI summary
An operation method of a signal receiver includes sequentially receiving 0-th and first bits through one signal line, and adjusting a width of any one of a first high duration and a first low duration of a first signal corresponding to the first bit, based on values of the 0-th and first bits, when the values of the 0-th and first bits are identical to each other.