Memory I/O Power Domain Waveform Matching via Iterative CPM
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Solution Overview
Problem
Current power delivery network (PDN) analysis for memory unit I/O power domains struggles to ensure signal and power integrity, as existing methods fail to accurately match expected and current waveforms within tolerance limits, leading to suboptimal power delivery and performance in ASICs and SoCs.
Innovation Solution
A method involving signal and power integrity analysis for memory unit I/O power domains, which generates a current chip power model (CPM) through look-up tables and iterative remedial operations to match expected and current waveforms within a tolerance limit, using a CPM generation module that includes signal integrity, power integrity, and static timing analysis modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing PDN analysis methods are used for memory unit I/O power domains, then the analysis can be performed with simple procedures, but the waveform matching accuracy between expected and current waveforms deteriorates, failing to meet tolerance limits
Solution Approach 1:
The patent applies preliminary action by pre-generating a current power model (CPM) for the memory unit I/O power domain before performing PDN analysis. The CPM includes pre-calculated current waveforms, impedance values, and power consumption characteristics that serve as reference data during the analysis process, enabling accurate waveform matching without requiring complex real-time calculations
Solution Approach 2:
The patent implements feedback by iteratively comparing the expected waveform (from CPM) with the actual current waveform extracted from signal integrity analysis. When the waveforms do not match within the tolerance limit (e.g., 2%), the analysis process feeds back to adjust the power model parameters and re-evaluate, ensuring high measurement precision through continuous refinement
2Manufacturing precision
If iterative remedial operations are performed to match waveforms within tolerance limits, then power delivery accuracy is improved, but the analysis time and computational resources increase
Solution Approach 1:
The patent applies partial action by implementing a tolerance-based stopping criterion for the iterative remedial operations. Instead of requiring perfect waveform matching, the process stops when the difference between expected and current waveforms falls within a predetermined tolerance limit (e.g., 2%), achieving sufficient power delivery accuracy without unnecessary additional iterations that would waste time
Solution Approach 2:
The patent utilizes parameter changes by adjusting key parameters such as activity factors, timing parameters, and impedance values during iterative remedial operations. The CPM generation module modifies these parameters systematically to bring the current waveform into alignment with the expected waveform, improving power delivery accuracy through controlled parameter optimization
3Reliability
If signal and power integrity analysis is performed with detailed waveform extraction, then the reliability of power delivery is improved, but the complexity of the analysis system increases
Solution Approach 1:
The patent applies segmentation by dividing the PDN analysis system into distinct functional modules: a CPM generation module that creates the current power model, a signal integrity analysis module that extracts current waveforms, a comparison module that evaluates waveform matching, and a remedial operations module that adjusts parameters. This modular segmentation improves reliability through specialized processing in each module while managing overall system complexity through clear separation of functions
Solution Approach 2:
The patent introduces an intermediary element in the form of the Current Power Model (CPM) that acts as a mediator between the signal integrity analysis and the power delivery evaluation. The CPM contains pre-calculated reference data and expected waveforms that bridge the gap between theoretical power requirements and actual measured performance, improving reliability without requiring direct complex interaction between all analysis components
Data Source
AI summary
The disclosed technology provides methods for performing a power delivery network analysis of the memory unit I/O power domain. The methods include performing a signal and power integrity analysis for a memory unit I/O power domain to extract characteristics of a current waveform, determining characteristics of an expected waveform based on a current response for the memory unit I/O power domain, and determining whether the characteristics of the current waveform and the characteristics of the expected waveform are within a tolerance limit. The method also includes various remedial operations and CPM regeneration which may iteratively occur until the waveform matches and final CPM is generated which is use for PDN analysis.