HBM Interface Encoding to Minimize Victim-Aggressor Crosstalk
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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 primarily address either capacitive or inductive coupling without considering both effects, and are not optimized for HBM's specific interface structure.
Innovation Solution
A semiconductor device with a first encoding circuit that encodes data into symbol groups, minimizing transitions on aggressor lines when the victim line transitions, using a grid pattern arrangement and encoding vectors based on Fibonacci sequence relationships to reduce 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 data stream is segmented into units of 2 bits (one upper bit and one lower bit), where the upper bit corresponds to the victim line and the lower bit corresponds to aggressor lines. This segmentation allows independent control of transitions on victim and aggressor lines, reducing crosstalk noise without requiring extensive overhead bits.
Solution Approach 2:
Instead of preventing all consecutive transitions (as in conventional CAC), the invention applies partial action by preventing transitions only when the upper bit (victim line) transitions and the lower bit (aggressor line) would also transition. This selective approach reduces crosstalk noise while minimizing overhead.
2Object-affected harmful factors
If conventional coding techniques are applied to HBM interface, then crosstalk noise reduction is achieved, but applicability is limited due to optimization for specific interface structure
Solution Approach 1:
The encoding scheme is designed to be universally applicable to HBM interfaces by considering both capacitive and inductive coupling effects simultaneously. The 2-bit unit structure (upper and lower bits) can be applied to any victim-aggressor line configuration in HBM, making it versatile across different HBM interface structures.
Solution Approach 2:
The invention changes the encoding parameters by using a 2-bit unit structure where the relationship between upper and lower bits is defined based on their physical correspondence to victim and aggressor lines. This parameter change allows the coding technique to adapt to the specific characteristics of HBM interfaces, including both capacitive and inductive coupling effects.
3Device complexity
If conventional coding techniques assume only one coupling factor (capacitive or inductive), then coding complexity is reduced, but effectiveness is compromised by not accounting for both effects
Solution Approach 1:
The data stream is segmented into units of 2 bits (one upper bit and one lower bit), where the upper bit corresponds to the victim line and the lower bit corresponds to aggressor lines. This segmentation allows independent control of transitions on victim and aggressor lines, reducing crosstalk noise without requiring extensive overhead bits.
Solution Approach 2:
Instead of preventing all consecutive transitions (as in conventional CAC), the invention applies partial action by preventing transitions only when the upper bit (victim line) transitions and the lower bit (aggressor line) would also transition. This selective approach reduces crosstalk noise while minimizing overhead.
Data Source
AI summary
A semiconductor device includes a first encoding circuit encoding data to generate encoding data including one or more symbol groups, each of the symbol groups including an upper symbol and a lower symbol; and a second encoding circuit generating transmission data by performing an operation on previous transmission data and the encoding data. 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. A plurality of data lines of the semiconductor device are arranged in a grid pattern, the victim line is a data line included in an inner row among the plurality of data lines, and each of the aggressor lines is a data line located adjacent the victim line. The upper symbol corresponds to the victim line and the lower symbol corresponds to the aggressor lines.