3D Semiconductor Base Die Channel Initialization

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Solution Overview

Problem

Existing 3D semiconductor apparatuses face challenges in efficiently initializing channels across a varying number of stacked dies, leading to inefficiencies in signal transmission and reception, particularly when not all dies are electrically connected.

Innovation Solution

A semiconductor apparatus design that includes a base die and multiple stack dies, where the base die initializes all channels regardless of the number of stack dies, using through-silicon vias for electrical coupling and redistribution layers to ensure consistent structure and operation across all dies.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If each die initializes its own channels independently, then channel initialization is simplified for each die, but channels not electrically connected to stack dies cannot be properly initialized

Engineering Contradiction:

Improvechannel initialization completenessVSAvoidinitialization control logic

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The base die is designed to perform dual functions: it acts as both a functional component (first die) and as the initialization controller for all channels. This universal role allows the base die to initialize channels regardless of whether they are connected to stack dies or not, eliminating the need for separate initialization logic and ensuring complete channel initialization across the 3D semiconductor apparatus.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If all channels are initialized by the base die, then channel initialization completeness is improved, but the base die's operational load increases

Engineering Contradiction:

Improvechannel initialization completenessVSAvoidbase die energy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The base die performs channel initialization as a preliminary action during the startup sequence, before normal operational activities. By completing all channel initializations during this initial phase, the base die avoids the need to continuously manage initialization tasks during operation, thereby reducing its ongoing operational load and energy consumption while ensuring all channels are properly initialized.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If through-silicon vias are used to connect all dies, then electrical connectivity is improved, but manufacturing complexity and cost increase

Engineering Contradiction:

Improveelectrical connectivityVSAvoidmanufacturing process complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Instead of requiring through-silicon vias to connect all dies uniformly, the patent applies electrical connectivity selectively: stack dies are connected to the base die through TSVs only where needed for their specific functions. Channels not requiring electrical connection to stack dies are still initialized by the base die but remain electrically isolated. This local quality approach maintains necessary connectivity while reducing manufacturing complexity and cost.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS9305909B23D semiconductor apparatus for initializing channels

Publication Date: 2016.04.05 SK HYNIX INC

AI summary

A semiconductor apparatus includes a plurality of stack dies which are formed with a predetermined number of channels. The semiconductor apparatus also includes a base die configured to initialize a channel not electrically coupled with the stack dies.