Wafer-Scale Supercomputer Interconnects for Bandwidth
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Solution Overview
Problem
Contemporary supercomputers face limitations in bisectional bandwidth due to the speed and number of electrical links between processor chips, which restricts computational tasks such as sparse matrix multiplication and large fast Fourier transforms.
Innovation Solution
A semiconductor structure with a substrate featuring cooling layers, laminate substrates, and a device layer with thermal expansion matching the cooling layers, allowing for efficient thermal management and interconnection without mechanical stress, and a data processing structure with multiple semiconductor processor wafers interconnected by on-chip wiring and liquid cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple processor chips are used to increase computational power, then processing capability is improved, but bisectional bandwidth is limited by the speed and number of electrical links between chips
Solution Approach 1:
The patent merges multiple processor chips into a single wafer-scale integrated circuit, creating a unified processor array where thousands of processors share common on-chip interconnect structures. This integration eliminates the need for external electrical links between separate chips, providing vastly superior bandwidth for collective operations while maintaining high computational power through parallel processing.
2Speed
If processors are placed in close proximity on the same chip to increase bandwidth, then bisectional bandwidth is improved, but chip size is limited by lithographic field size and packaging technology
Solution Approach 1:
The patent transitions from two-dimensional chip layouts to three-dimensional wafer-scale integration, utilizing the full surface area of large-diameter wafers (e.g., 300mm) and stacking multiple processor layers vertically. This dimensional expansion allows thousands of processors to be packed in close proximity while maintaining manageable interconnect complexity through hierarchical interconnection networks.
3Adaptability or versatility
If electrical interconnects are used to connect processors, then connectivity is achieved, but power consumption increases and cost increases compared to on-chip interconnects
Solution Approach 1:
The patent combines processing elements and interconnect structures into a single on-chip integration, eliminating the need for separate electrical interconnect packages between chips. This unified architecture provides the same connectivity functionality with dramatically reduced power consumption and cost, as all processors share common on-chip interconnect resources rather than requiring dedicated point-to-point links.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances computational performance by increasing bisectional bandwidth and reducing thermal stress, enabling efficient processing of complex tasks like sparse matrix multiplication and large fast Fourier transforms.
Implementation Method 1
one or more cooling layers... disposed on, and electrically attached to, the device layer... a device layer thermal coefficient of expansion is substantially equal to that of the one or more cooling layers
Implementation Method 2
one or more cooling channels, one or more coolant inlets and outlets in fluid communication with the cooling channels
Implementation Method 3
a device layer thermal coefficient of expansion is substantially equal to that of the one or more cooling layers... the laminate substrates are small enough to substantially prevent warping and unacceptable stress of the device layer, interconnection and cooling layers due to thermal expansion
Data Source
AI summary
A semiconductor structure includes a substrate with cooling layers, cooling channels, coolant inlets and outlets in fluid communication with the cooling channels, and a device layer on the cooling layers with one or more connection points and a device layer area. The device layer thermal coefficient of expansion is substantially equal to that of the cooling layers. A plurality of laminate substrates are disposed on, and electrically attached to, the device layer. The laminate substrate thermal coefficient of expansion differs from that of the device layer, each laminate substrate is smaller than the device layer portion to which it is attached, and each laminate substrate includes gaps between sides of adjacent laminate substrates. The laminate substrates are not electrically or mechanically connected to each other across the gaps therebetween and the laminate substrates are small enough to prevent warping of the device, interconnection and cooling layers due to thermal expansion.