Clock Gate Circuit With Balanced Edges for Dual-Edge Data Capture
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Solution Overview
Problem
Conventional clock signal generation in integrated circuits is limited by the inability to effectively capture data at both rising and falling edges, leading to timing differences and inefficiencies in clock edge transitions.
Innovation Solution
A clock gate circuit is developed, comprising a time-balanced multiplexer and logic module, which configures clock signals to have balanced rising and falling edges, allowing data capture at both edges and ensuring constant delay transitions, using a multiplexer that selects logic signals based on reference clock transitions and an enable signal, with latch modules and voltage-pulling mechanisms for sustained signal states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional clock signal generation is used, then the circuit structure is simple, but data capture is limited to one type of edge (rising or falling) leading to timing differences
Solution Approach 1:
The clock gate circuit is segmented into distinct functional modules: a multiplexer module for selecting between first and second logic signals, and a logic module for generating these logic signals. This segmentation allows independent optimization of each module's function, enabling versatile data capture at both rising and falling edges while maintaining manageable circuit complexity through modular design.
Solution Approach 2:
The clock gate circuit is designed with multi-functionality to capture data at both rising and falling edges of clock signals. The multiplexer module can selectively output either the first logic signal during rising edges or the second logic signal during falling edges, making the circuit universally applicable for different data capture requirements without needing separate dedicated circuits for each edge type.
2Reliability
If separate logic module and multiplexer module are configured, then timing requirements and logic requirements can be satisfied, but the device complexity increases
Solution Approach 1:
The circuit implements local quality by assigning specific functions to specific modules: the logic module is optimized for generating logic signals with proper timing characteristics, while the multiplexer module is optimized for selecting between signals based on clock edge transitions. This localized functional specialization ensures that timing requirements are met in the logic module while the multiplexer handles signal selection, improving overall timing precision without requiring complete redesign of the entire circuit.
Solution Approach 2:
The logic module generates the first and second logic signals in advance before the clock edge transitions occur. By preparing these logic signals beforehand and storing them in latch circuits, the circuit ensures that when rising or falling edges occur, the appropriate pre-prepared logic signal is immediately available for selection by the multiplexer, thereby satisfying timing requirements without adding complex real-time processing.
3Stability of the object's composition
If time-balanced multiplexer is used, then rising and falling edges are mutually balanced reducing timing differences, but the manufacturing precision requirements increase
Solution Approach 1:
The time-balanced multiplexer is designed to provide equipotential timing characteristics for both rising and falling edges, meaning that the propagation delay and signal transition characteristics are made equivalent for both edge types. This is achieved by symmetric circuit design in the multiplexer where the signal paths for selecting first logic signal during rising edges and second logic signal during falling edges are designed to have matched delays, thereby balancing the clock edges and improving stability without requiring excessive manufacturing precision beyond standard matching practices.
Data Source
AI summary
Aspects of the disclosure provide a clock gate circuit for generating a clock signal. The clock gate circuit includes a multiplexer and a logic module coupled to the multiplexer. The multiplexer is configured to receive a first logic signal at a first data input, a second logic signal at a second data input, and a reference clock signal at a selector input, and to output the clock signal having a logic state selected from one of the first logic signal or the second logic signal based on transitions of the reference clock signal. The logic module includes at least one of an XNOR and an XOR module and is configured to provide an output signal that is responsive to performing at least one of an XNOR and an XOR operation of the output of the multiplexer and an enable signal that enables or disables the clock gate circuit to generate the clock signal.