D Latch Activation Gating for Stable, Compact Data Storage
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Solution Overview
Problem
Existing storage devices using latches or asynchronous flip-flops face challenges in maintaining signal stability due to uncontrolled fluctuations, and the use of flip-flops requires more space in integrated circuits.
Innovation Solution
A storage device comprising an AND logic gate and a D latch, where the D latch is activated only when a stable selection signal is received, ensuring that the latch is not impacted by signal perturbations and reducing the space requirements by eliminating the need for flip-flops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flip-flop is used for stable data storage, then signal stability is improved, but the space occupied in the integrated circuit increases
Solution Approach 1:
The patent introduces an AND logic gate as an intermediary component between the selection signal and the D latch activation input. This intermediary filters the activation signal by requiring both the selection signal and its complement to be stable before enabling the latch, thereby achieving flip-flop level stability without using a flip-flop structure. The AND gate mediates the signal conditioning while occupying minimal space compared to a full flip-flop implementation.
2Area of stationary object
If a latch is used to minimize space, then space occupation is reduced, but the latch becomes impacted by uncontrolled fluctuations in the activation signal
Solution Approach 1:
The patent applies preliminary action by conditioning the activation signal before it reaches the D latch. The AND logic gate performs preliminary filtering of the selection signal, ensuring that the latch activation input only receives stable signals. This preliminary signal conditioning prevents fluctuations from affecting the latch operation, thereby maintaining reliability while using the space-efficient latch structure.
Data Source
AI summary
A device includes an AND logic gate and a D latch. The AND logic gate includes a first input configured to be coupled to a third-party device to receive a selection signal, a second input configured to be coupled to the third-party device to receive a status signal, and an output configured to transmit an output signal when the selection signal and the status signal are received. The D latch is capable of storing datum. The D latch includes an activation input coupled to the output of the AND logic gate and a data input configured to be coupled to the third-party device to receive a data signal that is representative of the datum. The D latch is configured to store the datum in response to the output signal.