Receiving Circuit Termination Control for Accurate Data Strobe Detection
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Solution Overview
Problem
Existing receiving circuits face challenges in accurately recognizing data strobe signals due to unstable transmission line levels during periods of no communication, leading to potential misinterpretation of signal levels and reduced signal symmetry.
Innovation Solution
A receiving circuit is designed with a terminating resistor and detection circuit that adjusts resistance to set the transmission line to a middle voltage level, ensuring accurate detection of signal levels and maintaining signal symmetry by activating or deactivating terminating circuits based on communication direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a terminating resistor is used to set the transmission line to a middle voltage level, then signal detection accuracy is improved, but device complexity increases due to the need for adjustment circuits
Solution Approach 1:
The patent applies dynamics by making the terminating resistor adjustable rather than fixed. The adjustment circuit dynamically changes the resistance value based on communication direction (transmitting or receiving mode), allowing the transmission line to be optimally terminated for each mode. This dynamic adjustment resolves the contradiction by enabling accurate signal detection in both modes while managing circuit complexity through controlled adaptability.
Solution Approach 2:
The patent changes the resistance parameter of the terminating resistor based on operational mode. When switching between transmitting and receiving modes, the adjustment circuit modifies the resistance value to maintain proper impedance matching. This parameter change approach allows the system to achieve accurate signal detection for both modes without requiring completely separate circuits, thus balancing detection accuracy with circuit complexity.
2Stability of the object's composition
If the terminating resistor resistance is adjusted based on communication direction, then signal symmetry is improved, but control complexity increases
Solution Approach 1:
The patent implements feedback through the adjustment circuit that monitors the communication direction (transmitting or receiving mode) and automatically adjusts the terminating resistor accordingly. This feedback mechanism ensures that the transmission line is properly terminated for the current mode of operation, maintaining signal symmetry without requiring manual intervention or complex external control systems.
Solution Approach 2:
The adjustment circuit performs self-service by automatically adjusting the terminating resistor based on the communication direction detected within the system. The circuit monitors its own operational state and makes appropriate resistance adjustments without external control, thereby maintaining signal symmetry while minimizing control complexity.
3Device complexity
If the transmission line level is left unstable during no communication, then device simplicity is maintained, but signal detection reliability deteriorates
Solution Approach 1:
The patent applies preliminary action by setting the transmission line to a defined middle voltage level through the terminating resistor before actual communication begins. This preliminary termination prevents the transmission line from floating at an unstable voltage level during idle periods, ensuring that when communication starts, the line is already in a known state ready for accurate signal detection, thus improving reliability without significantly increasing complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution ensures accurate detection of data strobe signals and reduces signal reflection and distortion, maintaining signal symmetry and improving communication efficiency.
Implementation Method 1
a terminating resistor to set a terminating level of a transmission line for transmitting a reception signal
Data Source
AI summary
A receiving circuit includes: a terminating resistor to set a terminating level of a transmission line for transmitting a reception signal including a signal having a first level indicating a preamble; a detection circuit to detect whether a level of the transmission line is the first level or a second level; and an adjustment circuit to adjust a resistance of the terminating resistor, the adjustment circuit adjusting the resistance of the terminating resistor to a value such that the detection circuit detects the level of the transmission line as the second level when a data request is output to a transmitting side.