Memory Interface Shim Die for High-Bandwidth Stacked RAM Routing
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Solution Overview
Problem
Current high-bandwidth memory technologies face limitations in bandwidth, energy efficiency, and integration complexity, particularly in communication between stacked random-access memory dies and application-specific integrated circuits, often requiring silicon interposers for communication channels.
Innovation Solution
The introduction of a tightly-coupled random access memory interface shim layer or die that relocates and coalesces connections between stacked memory dies and application-specific integrated circuits, reducing the need for direct integration of communication interface componentry and eliminating the requirement for silicon interposers, by using either passive or active interface shim layers to facilitate communication and signal routing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicon interposers are used to provide communication channels between stacked memory dies and application-specific integrated circuits, then communication capability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies the intermediary principle by introducing a specialized interface shim layer that acts as a mediator between the stacked memory dies and the application-specific integrated circuit. This shim layer provides the necessary communication channels and signal routing functionality that would otherwise require complex silicon interposers, thereby simplifying the overall device structure while maintaining communication capability.
Solution Approach 2:
The patent segments the integration function by separating the interface shim layer from the application-specific integrated circuit. The shim layer is designed as a distinct component with dedicated communication interface componentry, allowing it to be optimized independently while reducing the complexity burden on the main ASIC device.
2Reliability
If communication interface componentry is directly integrated into application-specific integrated circuits, then communication capability is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The interface shim layer serves as an intermediary component that handles communication interface functions externally to the ASIC. This separation allows the ASIC to be manufactured using standard processes while the specialized communication interface functionality is provided by the shim layer, which can be manufactured and tested independently before assembly.
Solution Approach 2:
The patent extracts the communication interface componentry from the application-specific integrated circuit and places it in a separate interface shim layer. This extraction simplifies the ASIC manufacturing process while maintaining the necessary communication capabilities through the external shim layer interface.
3Productivity
If stacked memory dies are directly connected to application-specific integrated circuits, then bandwidth is improved, but integration complexity increases
Solution Approach 1:
The interface shim layer acts as a mediator that facilitates direct high-bandwidth connections between stacked memory dies and the external world without requiring direct integration with the ASIC. The shim layer provides the necessary signal routing and interface functionality, enabling high bandwidth operation while keeping the overall integration complexity manageable through modular design.
Data Source
AI summary
An interface shim layer for a tightly-coupled random access memory device is disclosed. The interface shim layer redirects and coalesces integrated channels and connections between a stacked plurality of memory die and an application specific integrated circuit and directly connects to the memory die and to the application specific integrated circuit. A passive version of the interface shim layer incorporates a plurality of routing layers to facilitate routing of signals to and from the stacked plurality of memory die and the application specific integrated circuit. An active version of the interface shim layer incorporates separate physical interfaces for both the stacked plurality of memory die and the application specific integrated circuit to facilitate routing. The active version of the interface shim layer may further incorporate memory controller functions, built-in self-test circuits, among other capabilities that are migratable into the active interface shim layer.