Output Control Signal Latching for High-Speed Data Output
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Solution Overview
Problem
Conventional data output circuits experience increased signal loading and delay during high-speed operations, leading to data output errors due to insufficient timing margins, particularly when generating output control signals in response to the output enable signal.
Innovation Solution
A data output circuit that includes an output control signal generation unit which latches signals at an earlier time by combining a sub output enable signal with a delay fixing clock signal, generating output control signals and utilizing a register to output stored data, thereby reducing signal loading and delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional data output circuits operate at high speeds, then productivity increases, but signal loading and delay increase causing data output errors
Solution Approach 1:
The patent applies preliminary action by generating preliminary output control signals in advance before the main output operation. The preliminary signals are generated based on the output enable signal and then latched at the appropriate timing, allowing the main data output to proceed without delay while maintaining accuracy. This pre-preparation of control signals resolves the contradiction by enabling high-speed operation without sacrificing reliability.
2Reliability
If signal loading is reduced to maintain timing margin, then data output accuracy improves, but signal delay increases reducing operation speed
Solution Approach 1:
The patent segments the output control signal generation into two distinct parts: preliminary output control signals and final output control signals. The preliminary signals are generated with minimal loading to maintain speed, while the final signals are latched at precise timing to ensure accuracy. This segmentation allows each part to be optimized independently, resolving the contradiction between speed and reliability.
Solution Approach 2:
The patent introduces preliminary output control signals as an intermediary between the output enable signal and the final output control signals. These preliminary signals serve as a buffer that can be generated quickly without heavy loading, then latched at the appropriate timing to produce the final control signals with proper timing margins. This intermediary structure enables both high speed and high reliability.
Data Source
AI summary
A data output circuit includes an output control signal generation unit configured to generate output control signals in response to an output enable bar signal and a delay locked clock signal and a register configured to output stored data in response to the output control signals.