Adaptive Clock Delay Compensation Circuit
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Solution Overview
Problem
Long electrical cables introduce time delays in communication systems, causing synchronicity problems between clock signals and data signals, especially as clock frequency increases, leading to issues in data transfer between control circuits and remote peripheral devices.
Innovation Solution
An adaptive clock delay compensation circuit measures the delay between devices during initialization and generates a delayed clock signal for data transfer, automatically scaling to different cable lengths, ensuring accurate data reception by synchronizing clock and data signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the cable length is increased to extend communication distance, then the coverage area is improved, but the time delay increases causing data synchronicity problems
Solution Approach 1:
The system performs preliminary delay measurement during an initialization phase before actual data transfer. The control circuit sends a test clock signal, measures the round-trip delay, calculates the one-way delay, and stores this value for compensation during subsequent operations. This preliminary action enables the system to proactively compensate for cable-induced delays rather than reacting to timing errors.
Solution Approach 2:
The system dynamically adjusts the clock signal parameters by applying a calculated delay compensation value to the clock signal sent to the data interface. The delay compensation value is derived from the measured cable delay and is used to shift the clock signal timing, thereby changing the temporal parameter of the clock signal to match the data signal arrival time at the data interface.
2Productivity
If the clock frequency is increased to improve data transfer speed, then the productivity is improved, but the timing precision requirements increase making synchronicity more difficult to maintain
Solution Approach 1:
The system implements a feedback mechanism where the measured cable delay is used to adjust the clock signal timing. The delay measurement process involves sending a test signal, detecting its return, calculating the delay, and using this information to compensate future clock signals. This closed-loop feedback ensures that even at high clock frequencies, the timing relationship between clock edges and data signals is maintained.
Solution Approach 2:
The system applies delay compensation to the clock signal in advance before data transfer begins. By pre-calculating the required delay adjustment based on cable length and applying it to the clock signal generation, the system proactively counteracts the timing skew that would otherwise occur during high-speed data transfer, maintaining synchronicity without requiring complex real-time adjustments.
3Reliability
If a delay compensation mechanism is added to maintain data synchronicity, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The control circuit performs the delay measurement and compensation calculation using its own existing resources - its clock signal, data interface, and processing capabilities. The system measures the delay of its own transmitted signal and uses this information to adjust its own clock signal output. This self-service approach avoids the need for separate dedicated measurement hardware or external calibration equipment, reducing overall system complexity.
Solution Approach 2:
The control circuit serves multiple functions: it acts as a data processor, a signal transmitter, a delay measurement instrument, and a clock signal generator with compensation capability. By making the control circuit multi-functional, the patent eliminates the need for separate dedicated components for delay measurement and compensation, thereby reducing device complexity while maintaining reliability through comprehensive delay compensation.
Data Source
AI summary
A system includes a CPU, a serial interface, and an adaptive clock delay compensator. The adaptive clock delay compensator is configured to generate a clock signal at a first frequency, detect an edge on a data signal, and count the number of clock cycles of a counter clock to measure the delay between an edge of the clock signal and the detected edge on the data signal to produce a first delay value. The CPU is configured to convert the first delay value to a different clock domain at a second frequency to produce a converted delay value, and initiate a data transfer operation using the second frequency as a clock signal. The adaptive clock delay compensator is configured to generate a delayed clock signal at the second frequency to the serial interface that is delayed from the clock signal at the second frequency by the converted delay value.