Modular D2D Link Macro Lane Repair for Asymmetric Bandwidth
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Solution Overview
Problem
Existing technologies fail to address the need for flexible die-to-die lane repair in multi-die systems, particularly in scenarios requiring asymmetric bandwidths, as current standards assume symmetrical interfaces.
Innovation Solution
A multi-die system with modular die-to-die link macros that allow for configurable repair groups, where the number of data and redundant lanes can be independently configured, and their locations within the die floor plan are also customizable, based on use case and packaging yield properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant lanes are provided using current standards (UCIe, BoW, OHBI), then lane failure repair is enabled, but flexibility for asymmetric bandwidth requirements is lost
Solution Approach 1:
The patent segments the D2D link into multiple independent repair groups, where each group can be configured with different numbers of data lanes and redundant lanes. This allows asymmetric configuration where one direction has more lanes than the other, resolving the contradiction between providing redundancy and maintaining flexibility for asymmetric bandwidth requirements.
Solution Approach 2:
The patent introduces dynamic configurability where the number of data lanes (D) and redundant lanes (R) in each repair group can be independently adjusted based on actual bandwidth requirements. This dynamic adjustment capability enables the system to adapt to asymmetric bandwidth needs while maintaining repair functionality.
2Device complexity
If standard symmetrical interface topologies are used, then interface simplicity is maintained, but adaptability to asymmetric bandwidth scenarios is reduced
Solution Approach 1:
The interface is segmented into multiple repair groups with independent configurations. Each repair group can have different numbers of data lanes and redundant lanes, allowing the overall interface to support asymmetric bandwidth requirements while maintaining a modular and manageable structure.
Solution Approach 2:
The patent enables parameter changes in the interface configuration, specifically allowing the number of data lanes (D) and redundant lanes (R) to be independently configured for each repair group. This parameter flexibility allows the interface to adapt to asymmetric bandwidth scenarios without fundamentally changing the topology.
3Ease of manufacture
If fixed redundant lane configurations are implemented, then implementation simplicity is maintained, but flexibility for different use cases is lost
Solution Approach 1:
The patent implements dynamic configuration capabilities where the number of data lanes (D) and redundant lanes (R) can be independently adjusted for each repair group based on specific use cases. This dynamic approach maintains implementation simplicity through a unified framework while providing the flexibility needed for different applications.
Solution Approach 2:
The patent creates a universal repair configuration framework that can accommodate multiple use cases through a single standardized approach. By allowing independent configuration of D and R parameters in each repair group, the system achieves multi-functionality without requiring separate implementations for different scenarios.
Data Source
AI summary
Systems and methods for configurable die-to-die lane repair in multi-die systems are described. A multi-die system includes a first die and a second die, each of which comprises modular D2D link macros, where each of the modular D2D link macros has M data lanes. A method for configuring die-to-die lane repair includes forming repair groups having D data lanes spanning M data lanes, or fewer than M data lanes, associated with one or more modular D2D link macros, where D is independently configurable for each repair group. The method further includes, for each one of the repair groups designating R redundant lanes from among the D data lanes, where R is a positive integer independently configurable for each repair group, and where a location of each of the designated redundant lanes within a die floor plan associated with a respective repair group is independently configurable.