Compound Read Buffer for Stacked Semiconductor Memory Synchronization
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Solution Overview
Problem
Stacked semiconductor memory devices face challenges in efficiently retrieving read data due to varying data access and buffer times across multiple memory devices, leading to asynchronous delays and inefficient buffer design requirements.
Innovation Solution
A compound read buffer system is implemented, comprising multiple buffer circuit components across the interface device and memory devices, allowing for effective straddling of multiple time domains and synchronizing data transfer across devices with different access times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple memory devices are vertically stacked to increase storage capacity, then data storage density is improved, but data access time synchronization deteriorates due to varying access delays across devices
Solution Approach 1:
The read buffer is segmented into multiple components: a first read buffer in the interface device and second read buffers in each memory device. This segmentation allows each buffer to independently manage data from its associated memory device, accommodating different access times without requiring all devices to synchronize perfectly.
Solution Approach 2:
The first read buffer in the interface device acts as an intermediary that receives data from multiple second read buffers located in different memory devices. This intermediary buffer absorbs timing variations and provides a unified data stream to the output, resolving the synchronization issue caused by varying access times across stacked devices.
2Device complexity
If a single read buffer is used in the interface device, then device complexity is reduced, but data retrieval efficiency deteriorates due to inability to handle asynchronous data from multiple devices
Solution Approach 1:
The read buffer functionality is segmented across multiple locations: second read buffers are placed in each memory device to capture data locally, while a first read buffer in the interface device aggregates the results. This segmentation enables efficient handling of asynchronous data without requiring a single complex centralized buffer.
Solution Approach 2:
The buffer architecture transitions from a single-dimensional centralized buffer to a multi-dimensional distributed buffer system. Second read buffers are distributed across different memory devices in the vertical stack, while the first read buffer operates at the interface level, creating a hierarchical buffer structure that improves data retrieval efficiency.
Data Source
AI summary
A stacked memory apparatus operating with a compound read buffer is disclosed. The stacked memory apparatus includes an interface device having a main buffer and a plurality of memory devices each having a device read buffer. Systems incorporating one or more stacked memory apparatuses and related method of performing a read operation are also disclosed.