Split Decode Latch Shared Feedback for Faster 2-to-4 Decoding
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Solution Overview
Problem
Conventional 2-to-4 address decode schemes experience significant delay due to the number of logic stages required, which can be reduced by implementing a split decode latch with shared feedback to improve performance.
Innovation Solution
A circuit configuration that generates an output signal and its digital complement using shared feedback, allowing the output and complement to be in complementary states during power-up, and operating within a single clock cycle, thereby reducing propagation delay and enabling efficient implementation in a 2-to-4 decoder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional 2-to-4 address decode scheme is used, then the decoding function is achieved, but the propagation delay is significant due to multiple logic stages
Solution Approach 1:
The latch is divided into two separate circuits: a first circuit that generates the output signal in response to the intermediate signal and clock signal, and a second circuit that generates both the intermediate signal and digital complement of the output signal. This segmentation allows parallel processing of signal generation, reducing the total propagation delay through the latch while maintaining the required decoding functionality.
Solution Approach 2:
The second circuit generates both the intermediate signal and the digital complement of the output signal simultaneously in advance, before the first circuit needs to process them. This preliminary action eliminates sequential delays and ensures that both signals are ready when needed, significantly reducing overall propagation delay.
2Speed
If the number of logic stages is reduced to improve performance, then propagation delay decreases, but ensuring complementary states during power-up becomes more challenging
Solution Approach 1:
The intermediate signal generated by the second circuit is fed back to ensure that the output signal and digital complement remain in complementary states during power-up. This feedback mechanism automatically corrects any deviations from the desired complementary relationship, maintaining reliability even with reduced logic stages.
Solution Approach 2:
The second circuit combines the generation of both the intermediate signal and the digital complement of the output signal into a single unified circuit block. This merging ensures that both signals are generated with consistent timing and logical relationships, particularly during power-up transitions, thereby maintaining complementary state reliability.
Data Source
AI summary
An apparatus having a first circuit and a second circuit. The first circuit may be configured to generate an output signal in response to (i) an intermediate signal, and (ii) a clock signal. The second circuit may be configured to generate the intermediate signal and a digital complement of the output signal in response to (i) an input signal and (ii) the clock signal. The intermediate signal may form a feedback to ensure the output signal and the digital complement of the output signal are in complementary states during a power up.