Dual Pulse-Generator Circuits for Memory Pipeline Hold-Time Control
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Solution Overview
Problem
Memory devices experience hold time failures due to timing mismatches between memory clock signals and pipeline clock signals, leading to incorrect data transfer and reduced reliability.
Innovation Solution
Implementing a dual pulse generator system that generates pipeline clock signals based on both a delayed and a memory clock signal, synchronized to mitigate hold time failures by ensuring proper timing alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single pulse generator is used to generate pipeline clock signals, then device complexity is reduced, but timing alignment between memory clock signals and pipeline clock signals deteriorates, causing hold time failures
Solution Approach 1:
The single pulse generator is divided into two separate pulse generators: a first pulse generator that generates memory clock signals and a second pulse generator that generates pipeline clock signals. This segmentation allows each generator to be independently optimized for its specific timing requirements, thereby maintaining reliable timing alignment without significantly increasing overall device complexity
Solution Approach 2:
A delay circuit is introduced as an intermediary component between the clock signal source and the pipeline clock signal generation path. This delay circuit compensates for timing differences and ensures proper hold time alignment, acting as a mediator that coordinates the timing between memory operations and pipeline operations
2Ease of operation
If pipeline clock signals are generated without precise timing control, then ease of operation is improved, but hold time failures occur leading to incorrect data transfer
Solution Approach 1:
The pipeline clock signals are generated in advance with predetermined timing control, ensuring that data is ready in the pipeline before the next clock cycle begins. This preliminary timing setup prevents hold time failures and ensures accurate data transfer while maintaining simple operation through automated timing generation
Solution Approach 2:
The timing control mechanism incorporates feedback loops that monitor and adjust clock signal timing to maintain proper hold time alignment. This feedback ensures reliable data transfer by continuously optimizing timing parameters while keeping the system easy to operate through self-regulation
3Device complexity
If timing alignment between memory clock and pipeline clock is not maintained, then device complexity is reduced, but manufacturing precision of timing parameters deteriorates
Solution Approach 1:
The delay circuit introduces controllable parameter changes in the timing path by adjusting delay amounts through design parameters such as gate lengths, transistor dimensions, or buffer configurations. This allows precise control of timing alignment between memory and pipeline clocks without requiring complex timing control mechanisms, thereby achieving manufacturing precision while keeping device complexity manageable
Data Source
AI summary
A memory device includes one or more memory cells, and a pipeline coupled to the one or more memory cells. The memory device includes a first pulse generator coupled to the one or more memory cells. The first pulse generator is configured to generate, based on a first delayed clock signal, a memory clock signal to control the one or more memory cells. The first delayed clock signal is delayed with respect to a clock signal. The memory device includes a second pulse generator to generate, based on a second delayed clock signal and the memory clock signal, a pipeline clock signal to provide data from the one or more memory cells through the pipeline. The second delayed clock signal is delayed with respect to the clock signal.