Parallel Interface Channel Analysis Without Circuit Simulation
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Solution Overview
Problem
Current design methodologies for electronic circuits, particularly those with parallel interfaces, face challenges in analyzing signal integrity and performance due to the impracticality of general circuit simulation techniques for high-bandwidth buses, which are limited by the non-linearity of buffers and the need for comprehensive analysis techniques that are primarily suited for serial interfaces.
Innovation Solution
A method and system for characterizing electronic system designs with parallel interfaces using channel analysis techniques, which involve determining a single circuit representation, applying stimuli to transmitters, and analyzing responses at receivers without performing electrical or functional circuit simulations, allowing for waveform response determination and convolution with input signals to assess signal integrity and interference effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If general circuit simulation techniques (SPICE) are used to analyze parallel interfaces, then comprehensive analysis of signal integrity can be achieved, but the analysis becomes extremely time-consuming and impractical for high-bandwidth buses with tens of thousands of bits
Solution Approach 1:
The patent segments the complex parallel interface analysis into two distinct phases: (1) a time-domain simulation phase that captures interference effects from simultaneous switching, and (2) a frequency-domain channel analysis phase that evaluates signal integrity. This segmentation allows comprehensive analysis without requiring exhaustive time-domain simulation of all bus operations, thereby reducing analysis time while maintaining measurement precision.
Solution Approach 2:
The patent performs preliminary time-domain simulation to capture interference effects and generate equivalent noise sources before conducting the main channel analysis. By pre-characterizing the interference effects in a separate preliminary step, the main analysis can proceed more efficiently using frequency-domain techniques without repeatedly performing full time-domain simulations, thus resolving the contradiction between comprehensive analysis and analysis time.
2Productivity
If the number of bits in parallel interface is increased to achieve higher bandwidth (e.g., 128-bit, 256-bit buses), then data transfer capacity increases, but the complexity of circuit simulation increases dramatically making analysis impractical
Solution Approach 1:
The patent replaces the mechanical/time-domain circuit simulation approach with an electrical/frequency-domain channel analysis approach. Instead of performing computationally intensive time-domain simulations that scale poorly with bus width, the method uses frequency-domain techniques that are more efficient for analyzing large-scale parallel interfaces, thus enabling analysis of high-bandwidth buses without proportional increases in simulation complexity.
Solution Approach 2:
The patent changes the domain parameter from time-domain to frequency-domain for the channel analysis phase. This parameter change allows the analysis to handle larger numbers of bits more efficiently, as frequency-domain methods can process multi-gigahertz bandwidth signals and wide buses without the computational burden that plagues time-domain simulations, thereby supporting higher productivity without proportional complexity increases.
3Reliability
If simultaneous switching of all bits is analyzed using traditional methods, then complete interference effects can be captured, but the computational resources required become prohibitive for modern high-speed buses
Solution Approach 1:
The patent performs preliminary time-domain simulation to capture interference effects and generate equivalent noise sources before conducting the main channel analysis. This preliminary action pre-processes the interference information, allowing the subsequent frequency-domain analysis to achieve the same reliability with significantly reduced computational power requirements, as it avoids repeatedly performing full time-domain simulations.
Solution Approach 2:
The patent introduces equivalent noise sources as an intermediary representation of interference effects. Instead of directly simulating all simultaneous switching interactions throughout the main analysis, the method uses these equivalent noise sources to represent the cumulative interference effects, thereby maintaining reliability while reducing the computational power needed for the primary channel analysis.
Data Source
AI summary
Disclosed are methods and systems for characterizing and analyzing an electronic system design including a parallel interface. Some methods and systems identify an electronic design including a parallel interface, determine a single circuit representation including the parallel interface from the electronic design, and analyze the parallel interface to determine waveform responses of the parallel interface by using channel analysis techniques without performing circuit simulations. Some other methods and systems are directed at performing channel analyses for a communication interface of an electronic system by concurrently applying stimuli to corresponding transmitters of a communication interface, characterizing the communication interface to perform a single simulation on the communication interface with the stimulus to determine responses at receivers of the communication interface, and determining waveform responses of the communication interface by performing operations on the responses and an input signal to the communication interface.