Clock-Command Synchronization Circuit for Accurate Domain Crossing
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Solution Overview
Problem
Semiconductor apparatuses face challenges in accurately performing domain crossing due to large differences between synchronous and asynchronous delays, making it difficult to synchronize internal signals with clock signals effectively.
Innovation Solution
Incorporating a clock path, command path, delay monitoring circuit, and output control circuit to generate delay clock signals, delay control signals, and output enable signals, which monitor and synchronize the phase differences between clock and command signals, allowing for precise delay adjustments and synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If domain crossing is performed to synchronize internal signals with clock signals, then synchronization accuracy is improved, but the complexity of delay monitoring and control increases
Solution Approach 1:
The delay monitoring circuit proactively monitors the delay between clock and command signals before domain crossing operations, generating control signals in advance to adjust delay elements. This preliminary monitoring ensures synchronization accuracy is maintained without adding complex real-time control mechanisms during actual domain crossing operations.
Solution Approach 2:
The delay monitoring circuit continuously monitors the phase difference between clock and command signals, feeding back delay control signals to adjust delay elements. This closed-loop feedback mechanism maintains synchronization accuracy while keeping the control system manageable through automated adjustment rather than manual calibration.
2Measurement precision
If delay monitoring circuit is added to monitor phase difference, then synchronization precision is improved, but the device complexity increases
Solution Approach 1:
The delay monitoring circuit is designed to perform multiple functions: monitoring phase difference, generating delay control signals, and controlling delay elements. By making this single circuit multi-functional, the patent avoids adding separate dedicated circuits for each function, thereby improving phase difference monitoring precision without proportionally increasing overall device complexity.
Solution Approach 2:
The delay monitoring circuit automatically adjusts delay elements based on monitored phase differences without requiring external intervention. The circuit generates its own control signals and applies them to delay elements, making the synchronization process self-regulating and reducing the need for additional control logic elsewhere in the system.
3Manufacturing precision
If multiple delay locking operations are performed, then delay control accuracy is improved, but the operation time increases
Solution Approach 1:
A first delay locking operation is performed during initialization to establish baseline delay values before actual domain crossing operations. This preliminary locking ensures that subsequent operations start with accurate delay settings, improving overall delay control accuracy without requiring repeated locking during every synchronization event.
Solution Approach 2:
The delay monitoring and control operate continuously during domain crossing operations, maintaining accurate synchronization without interrupting the data transmission flow. The continuous monitoring ensures delay accuracy is preserved throughout operation while minimizing the time lost to synchronization corrections.
Data Source
AI summary
A semiconductor apparatus includes a clock path, a command path, a delay monitoring circuit, and an output control circuit. The clock path generates a delay clock signal by delaying a clock signal. The command path generates an output command signal from on one of a command signal and the clock signal, based on a monitoring signal. The delay monitoring circuit generates a delay control signal and a latency control signal based on a phase difference between the delay clock signal and the output command signal, when the monitoring signal is enabled. The output control circuit generates an output enable signal by synchronizing the output command signal with the delay clock signal, based on the latency control signal.