SerDes Memory Interface Architecture for High Bandwidth
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current memory interface architectures are inefficient due to their highly parallel nature, requiring a large number of pins and significant power consumption, which becomes prohibitive as memory bandwidth demands increase.
Innovation Solution
The use of a serializer/deserializer (SerDes) to convert parallel data into a high-speed serial data stream for direct die-to-die communication, reducing the need for pins and power by utilizing non-silicon interposers or eliminating them altogether, allowing for efficient high-speed data transmission within a package.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a highly parallel interface is used for memory communication, then data bandwidth is improved, but the number of pins required increases significantly
Solution Approach 1:
The parallel data bus is segmented into multiple serial lanes, where each lane transmits a portion of the data in sequence. This segmentation allows the same data bandwidth to be achieved with fewer physical pins by time-multiplexing the serial connections.
Solution Approach 2:
The interface transitions from a spatially parallel architecture (multiple simultaneous data paths) to a temporally serial architecture (single path with time-multiplexed data transmission). This dimensional change from space to time allows reduced pin count while maintaining bandwidth through increased clock rates and efficient serialization.
2Productivity
If a highly parallel interface is used for memory communication, then data bandwidth is improved, but power consumption increases significantly
Solution Approach 1:
The parallel interface is divided into serial segments that can be activated selectively. This segmentation reduces the number of simultaneously active signal paths, thereby reducing dynamic power consumption while maintaining the ability to achieve high bandwidth through efficient data serialization and increased clock frequencies.
Solution Approach 2:
The patent replaces the mechanical/electrical parallel switching infrastructure with a serialization-based approach that uses fewer physical connections. This substitution reduces the capacitive loading and signal switching requirements, leading to lower power consumption per bit transmitted.
3Device complexity
If the number of pins is reduced using serialization, then device complexity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent introduces an interposer as an intermediary layer between the semiconductor dies. This interposer provides precise alignment features and signal routing that compensate for manufacturing tolerances, enabling accurate die-to-die bonding with reduced pin counts while maintaining signal integrity through the serialized interface.
Data Source
AI summary
A memory interface architecture uses a serializer/deserializer (SerDes) to connect a memory array on one semiconductor die to a device on another semiconductor die, for example via a fast interposer.