Asymmetric Memory I/O Interface for High-Speed Data Transfer
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Solution Overview
Problem
The mismatch in internal operating speeds and I/O rates between devices in electronic systems, particularly between logic and memory devices, limits the overall system performance due to differences in fabrication processes, leading to issues with signal detection and transmission at high clock rates.
Innovation Solution
An asymmetric I/O interface is implemented, where the memory controller, fabricated using a logic process, drives signals with large voltage swings and fast slew rates, while the memory, fabricated for data retention, receives and transmits signals with lower voltage swings and slower slew rates, optimizing data transfer rates without exceeding the slew rate limitations of the memory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the memory is fabricated using a memory fabrication process optimized for data retention, then data retention is improved, but the transistor speed and I/O rate are reduced
Solution Approach 1:
The patent applies different fabrication processes to different parts of the system: memory devices use a memory fabrication process optimized for data retention, while logic devices use a logic fabrication process optimized for speed. This allows each component to have local quality optimized for its specific function without compromising the other.
Solution Approach 2:
The patent changes the fabrication process parameters between memory and logic devices. Memory devices are fabricated with parameters optimized for data retention (slower transistors), while logic devices use parameters optimized for speed (faster transistors). This parameter differentiation resolves the contradiction between data retention and speed.
2Productivity
If the system clock rate is increased to improve overall system performance, then productivity is improved, but the I/O operations are limited by the slowest device
Solution Approach 1:
The patent allows different parts of the system to operate at different speeds by using asymmetric voltage swings. Logic devices can operate at high clock rates with large voltage swings, while memory devices operate at slower rates with smaller voltage swings, eliminating the bottleneck effect.
Solution Approach 2:
The patent introduces dynamic adaptation by allowing the memory device to adjust its output voltage swing based on its internal operating speed. This dynamic adjustment enables the system to maintain reliable I/O operations while maximizing overall productivity.
3Device complexity
If the memory output circuits are designed to detect and transmit signals of similar voltage swings, then device complexity is reduced, but the maximum I/O rate is limited due to slew rate
Solution Approach 1:
The patent implements asymmetric I/O interfaces where logic devices use large voltage swings and memory devices use smaller voltage swings. This asymmetry allows the memory device to operate within its slew rate limitations while still achieving high effective data transfer rates through the controller's ability to handle larger swings.
Data Source
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AI summary
Apparatuses and methods for asymmetric input/output interfaces for memory are disclosed. An example apparatus may include a receiver and a transmitter. The receiver may be configured to receive first data signals having a first voltage swing and having a first slew rate. The transmitter may be configured to provide second data signals having a second voltage swing and having a second slew rate, wherein the first and second voltage swings are different, and wherein the first and second slew rates are different.