Output Controller Test Unit Dynamic Delay Adjustment
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Solution Overview
Problem
Conventional output controllers for semiconductor memory devices face challenges in accurately synchronizing data output with rising and falling edges of the external clock at high frequencies, leading to data failure due to fixed delay amounts that cannot account for Process, Voltage, and Temperature (PVT) variations.
Innovation Solution
An output controller with a test unit that adjusts the delay amount of the input clock based on test signals, allowing for dynamic adjustment of driving clocks to ensure accurate synchronization with the external clock edges, thereby preventing data failure across varying frequencies and PVT conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed delay amount is used in the output controller, then the device complexity is reduced, but the synchronization accuracy with external clock edges deteriorates under PVT variations
Solution Approach 1:
The patent implements a test unit that dynamically adjusts the delay amount of the input clock based on test signals and PVT conditions. Instead of using a fixed delay, the system continuously optimizes the delay parameter to maintain accurate synchronization with external clock edges, transforming a static delay mechanism into a dynamic one that adapts to varying operating conditions.
Solution Approach 2:
The patent changes the delay parameter of the input clock based on test results and PVT variations. By adjusting the delay amount as a variable parameter rather than a fixed value, the system maintains synchronization accuracy across different process, voltage, and temperature conditions, directly addressing the limitation of fixed delay mechanisms.
2Productivity
If the operating frequency is increased to achieve high-speed operation, then the productivity is improved, but the synchronization accuracy with external clock edges deteriorates
Solution Approach 1:
The patent introduces a test unit that provides feedback on the synchronization accuracy between the internal clock and external clock edges. This feedback mechanism allows the system to detect and correct timing deviations that occur at high operating frequencies, enabling the maintenance of synchronization accuracy even when processing speed is increased.
Solution Approach 2:
The system dynamically adjusts the delay amount based on test signals generated during high-frequency operation. This dynamic adaptation allows the output controller to maintain accurate synchronization with external clock edges regardless of the operating frequency, enabling high-speed operation without sacrificing timing precision.
3Measurement precision
If the delay amount is dynamically adjusted based on test signals, then the synchronization accuracy is improved, but the device complexity increases
Solution Approach 1:
The test unit is designed to perform multiple functions: generating test signals, measuring synchronization accuracy, and adjusting delay parameters. By consolidating these functions into a single multi-functional unit rather than separate dedicated components for each function, the patent reduces the overall device complexity while still achieving dynamic delay adjustment and improved synchronization accuracy.
Data Source
AI summary
There is provided an output controller with a test unit, which can test an appropriate delay amount according to an operating frequency under a real situation. The output controller includes an initial synchronizing unit for outputting a first output enable signal when a read CAS signal is activated; a plurality of synchronizing units connected in series to output an output signal of a previous stage as an output enable signal in synchronization with a corresponding driving clock, a first stage of the synchronizing units receiving the first output enable signal; and a test unit for adjusting a delay amount of an input clock according to a test signal and outputting the driving clock.