Grid-Pattern Data-Line Encoding for HBM Crosstalk Reduction
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Solution Overview
Problem
Conventional coding techniques for reducing crosstalk noise in high bandwidth memory (HBM) devices are inefficient due to high overhead and limited applicability, as they are optimized for specific interface structures and do not account for both capacitive and inductive coupling effects.
Innovation Solution
A semiconductor device with a first encoding circuit that encodes data to generate encoding data, and a second encoding circuit that generates transmission data by performing operations on previous transmission data, arranging data lines in a grid pattern, and ensuring that signals on aggressor lines do not transition simultaneously with the victim line, thereby reducing crosstalk noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional coding techniques (CAC based on Fibonacci sequence) are used to prevent three consecutive bits from transitioning, then crosstalk noise is reduced, but overhead increases due to addition of bits
Solution Approach 1:
The patent changes the encoding parameters by using a simplified coding scheme that transitions from preventing three consecutive bit transitions (CAC) to a new encoding approach with different transition rules. This parameter change reduces the overhead while maintaining crosstalk noise reduction effectiveness, specifically tailored for HBM's grid-pattern data line arrangement.
Solution Approach 2:
The patent applies local quality by designing encoding rules that are specifically optimized for the inner row victim lines in the grid pattern, rather than applying uniform encoding across all lines. The encoding scheme targets specific locations (inner rows with multiple aggressors) to reduce overhead while focusing crosstalk mitigation where it is most needed.
2Ease of manufacture
If existing coding techniques optimized for specific interface structures are applied to HBM, then implementation is simplified, but crosstalk noise reduction effectiveness decreases
Solution Approach 1:
The patent creates a universal encoding scheme that is specifically designed to work with HBM's grid pattern data line arrangement. The encoding method is multi-functional, handling both the structural characteristics of HBM and the electrical characteristics of crosstalk noise, making it adaptable to HBM's specific interface structure while effectively reducing crosstalk noise.
Solution Approach 2:
The patent introduces dynamic encoding rules that adapt to the grid pattern structure of HBM data lines. The encoding scheme dynamically adjusts transition prevention based on the position of victim lines and their surrounding aggressor lines, optimizing crosstalk reduction for each specific location in the grid pattern.
3Device complexity
If coding techniques assume only one coupling factor (capacitive or inductive) is significant, then design complexity is reduced, but general applicability decreases
Solution Approach 1:
The patent segments the crosstalk mitigation approach by separately analyzing and addressing capacitive coupling and inductive coupling effects in the grid pattern. By dividing the problem into these two coupling mechanisms and designing encoding rules that account for both, the patent achieves comprehensive crosstalk reduction while maintaining manageable design complexity.
Solution Approach 2:
The patent creates a composite encoding scheme that combines considerations for both capacitive and inductive coupling effects. Rather than using a single encoding rule for one coupling type, the patent integrates multiple coupling mechanisms into a unified encoding approach, making it generally applicable to HBM's complex electromagnetic environment.
Data Source
AI summary
A semiconductor device includes a first encoding circuit configured to encode data to generate encoding data including a plurality of symbols; and a second encoding circuit configured to generate transmission data by performing an operation on previous transmission data and the encoding data. A plurality of data lines of the semiconductor device are arranged in a grid pattern, and each of the plurality of symbols corresponds to a column of the data lines in the grid pattern. The first encoding circuit encodes the data to prevent a signal on each of one or more of aggressor lines from transitioning when a signal on a victim line transitions. The victim line is a data line included in an inner row of the data lines and each of the aggressor lines is a data line located adjacent to the victim line.