3D Stacked Chip Read Synchronization for Timing Skew Control
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Solution Overview
Problem
In three-dimensional semiconductor apparatuses, variations in process, voltage, and temperature (PVT) properties cause skews in data output timing between chips, leading to reduced operating speed to maintain data validity, which is undesirable.
Innovation Solution
A semiconductor apparatus with a reference clock generation unit in one chip and synchronization units in other chips, synchronizing read control signals with a reference clock to maintain consistent data output timing across all chips, reducing skews and enabling high-speed operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If chips are stacked in 3D semiconductor apparatus, then integration density is improved, but data output timing skew between chips increases
Solution Approach 1:
The patent applies preliminary action by generating a reference clock signal in advance from the master chip and distributing it to all slave chips before data operations occur. This pre-established timing reference enables all chips to synchronize their read control signals and data output operations, preventing timing skew from accumulating during operation while maintaining high integration density through 3D stacking.
2Productivity
If operating speed is increased, then productivity is improved, but data validity cannot be maintained due to timing skew
Solution Approach 1:
The patent implements feedback by having the master chip generate a reference clock signal based on the read command timing and distribute it to all slave chips. The slave chips use this reference clock to synchronize their data output operations, creating a feedback mechanism that continuously maintains timing alignment across all chips. This enables high operating speed while ensuring data validity through active timing synchronization.
3Manufacturing precision
If read control signals are synchronized with reference clock, then timing skew is reduced, but device complexity increases
Solution Approach 1:
The patent applies merging by combining the reference clock generation function into the master chip and having all slave chips synchronize to this single reference source. This consolidation approach reduces overall system complexity compared to implementing independent timing control in each chip, while still achieving precise timing synchronization across the 3D-stacked semiconductor apparatus.
Data Source
AI summary
A semiconductor apparatus has a plurality of chips stacked therein. Read control signals for controlling read operations of the plurality of chips are synchronized with a reference clock such that the time taken from the application of a read command to the output of data for each of the plurality of chips is maintained substantially the same.