DLL-Based Command Timing for Semiconductor Signal Synchronization
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Solution Overview
Problem
Semiconductor devices face challenges in accurately synchronizing external commands with internal operations due to varying latency and clock delays, leading to potential noise generation and inaccurate timing in signal transmission.
Innovation Solution
Incorporating first and second internal command generation circuits and DLL circuits to generate delay commands and control signals based on latency and clock signals, ensuring precise timing for ODT and data output operations by adjusting clock phases and delay times within the semiconductor device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple internal command generation circuits and DLL circuits are used to precisely control timing, then timing precision is improved, but device complexity increases
Solution Approach 1:
The device is divided into multiple independent DLL circuits (first DLL circuit, second DLL circuit) and internal command generation circuits, each responsible for specific timing control functions. This segmentation allows precise control of different signal paths while maintaining modularity, resolving the contradiction by organizing complexity into manageable functional blocks.
Solution Approach 2:
DLL circuits serve as intermediary components between external commands and internal operations, generating delay control signals that mediate timing adjustments. These intermediary circuits buffer and synchronize signals, enabling precise timing control without directly complicating the core command generation logic.
2Manufacturing precision
If delay control signals and DLL circuits are used to adjust clock phases, then timing accuracy is improved, but the device requires more complex control mechanisms
Solution Approach 1:
DLL circuits generate delay control signals in advance to pre-adjust clock phases before commands are executed. This preliminary timing adjustment ensures that subsequent operations occur at precisely synchronized moments, achieving high timing accuracy without requiring complex real-time control mechanisms during operation.
Solution Approach 2:
The system employs feedback mechanisms where DLL circuits continuously monitor and adjust delay control signals based on timing requirements. This feedback loop automatically fine-tunes clock phases and delay times, maintaining timing accuracy while reducing the need for manual intervention or overly complex control logic.
Data Source
AI summary
A semiconductor device may include a first internal command generation circuit, a first DLL circuit, a second internal command generation circuit, and a second DLL circuit. The first internal command generation circuit may generate a first delay command in response to a first external command, a first latency, a first clock, a first delay control signal, and a second clock. The first DLL circuit may generate the first delay control signal and the first second clock in response to the first clock. The second internal command to generation circuit may generate a second delay command in response to a second external command, a second latency, the first clock, a second delay control signal, and a third clock. The second DLL circuit may generate the second delay control signal and the third clock in response to the first clock.