Stacked Memory Die Identification via Interface Die Initialization
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Solution Overview
Problem
In stacked memory devices, efficiently detecting and assigning unique identification (ID) information to individual dice during the initialization period is challenging, especially when using through-silicon vias (TSVs) for electrical connection, which affects communication and configuration within a limited circuit area.
Innovation Solution
The implementation of an interface die with control circuitry and ID circuits that detect and count the number of dice in the stack, assigning ID information during the initialization period, and retaining it for optimized memory configuration and communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple semiconductor dice are stacked vertically to increase memory capacity in limited space, then memory density is improved, but detecting and assigning unique ID information to individual dice becomes more difficult
Solution Approach 1:
The patent divides the identification function into separate ID circuits located on each individual die within the stack. Each die has its own dedicated ID circuit that can be independently activated and detected, allowing the interface die to communicate with and identify each die separately despite their physical stacking configuration.
Solution Approach 2:
The patent introduces an interface die as an intermediary component between the external controller and the stacked memory dice. The interface die contains control circuitry that manages communication with all dice in the stack, including detecting and assigning ID information to each die through controlled signal transmission via TSVs.
2Volume of moving object
If through-silicon vias (TSVs) are used for electrical connection between stacked dice, then vertical integration is improved, but circuit area and communication complexity increase
Solution Approach 1:
The interface die serves multiple functions: it provides the external interface to the memory stack, manages communication with all individual dice, detects ID information from each die, assigns unique identifiers, and controls memory operations. This multi-functionality consolidates what would otherwise require separate circuits, reducing overall system complexity.
Solution Approach 2:
The patent implements preliminary detection and assignment of ID information to each die during the initialization period before normal memory operations begin. The interface die detects which dice are present in the stack and assigns ID information in advance, so that subsequent memory operations can efficiently reference each die by its assigned ID without requiring complex detection routines during operation.
3Productivity
If ID information is detected and assigned during the initialization period, then communication efficiency is improved, but the initialization time increases
Solution Approach 1:
The ID detection and assignment process is performed partially during initialization - specifically, the interface die detects which dice are present and assigns ID information to a subset of dice that are actually present in the stack. The process terminates when all dice have been accounted for, avoiding unnecessary detection cycles and reducing initialization time while ensuring complete coverage.
Data Source
AI summary
Various embodiments include apparatus and methods having circuitry to detect and/or assign identification information to dice arranged in a stack and coupled by conductive paths.