3D Multi-Tier Network Interface for Low-Latency Timing Closure
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Solution Overview
Problem
In 3D integrated circuit designs, the growth in chip area due to increased requirements for digital logic, memory, and communication interfaces, combined with global process skews between tiers, leads to high latency and yield limitations in volume manufacturing, necessitating improved circuit designs that reduce traffic latency while ensuring robust timing closure.
Innovation Solution
The implementation of a multi-dimensional network connection architecture with a multi-tiered structure that allows for low latency connections between 3D-stacked dies, using synchronous signaling and clock phase adjustments to compensate for process skews, and strategically locating flip-flops to minimize latency, along with redistributing logic gates across 3D boundaries to maintain timing closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If asynchronous domain crossings are placed at interfaces to confine timing paths to each die, then timing robustness is guaranteed, but latency increases
Solution Approach 1:
The patent replaces the mechanical/asynchronous interface crossing mechanism with an electrical/synchronous mechanism by extending the clock tree across 3D tiers and using synchronized flip-flops, thereby eliminating the need for asynchronous domain crossings while maintaining timing control
Solution Approach 2:
The patent transitions from 2D timing confinement to 3D timing synchronization by extending the clock distribution network vertically across multiple stacked dies, allowing timing paths to span multiple tiers while maintaining synchronization through the added dimensional connectivity
2Loss of time
If a synchronous clock-tree is used to enable u-architectural splitting between multiple 3D tiers, then latency is reduced, but timing closure becomes vulnerable to global process skews
Solution Approach 1:
The patent applies different timing strategies to different regions of the circuit by allowing synchronous clock-tree operation in regions where process matching is good, while providing alternative paths or compensation mechanisms in regions affected by global process skews
Solution Approach 2:
The patent compensates for global process skews by dynamically adjusting timing parameters such as clock phase and timing margins based on measured process variations, thereby maintaining timing closure robustness while benefiting from synchronous operation
3Area of stationary object
If chip area is increased to accommodate additional digital logic, memory, and communication interfaces, then functional requirements are met, but 2D systems design is limited
Solution Approach 1:
The patent transitions from 2D to 3D integrated circuit architecture by stacking multiple dies vertically and connecting them through through-silicon vias, thereby increasing functional capacity without proportionally increasing the footprint area and enabling new design paradigms in the third dimension
Data Source
AI summary
Various implementations described herein refer to a device having an integrated circuit with multiple tiers including a first tier and a second tier that are arranged vertically in a stacked configuration. The first tier may have first functional components, and the second tier may have second functional components. The device may have a three-dimensional (3D) connection within the first tier that allows for synchronous signaling between the first functional components and the second functional components for reducing latency between the multiple tiers including the first tier and the second tier.