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Techniques for improving high-speed communications in a computing system

A coefficient and equalization coefficient technology, applied in the field of optimal transmitter parameters, can solve problems such as difficult to identify signals

Pending Publication Date: 2020-09-04
NVIDIA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Various factors such as the signal's frequency content, transmission speed, and type of chip, link, and channel can affect signal quality and, in some cases, make the signal illegible to the device on the receiving end

Method used

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  • Techniques for improving high-speed communications in a computing system
  • Techniques for improving high-speed communications in a computing system
  • Techniques for improving high-speed communications in a computing system

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Experimental program
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Embodiment Construction

[0013] For transmit equalization in high-speed links, the transmitting device can be tuned using parameters called transmitter (TX) coefficients. A typical system may have hundreds of combinations of TX coefficients, and some of these combinations will produce better equalization results than others. Signal quality is critical in high-speed transmission channels, so choosing the best combination of TX coefficients is critical to ensure accurate transmission.

[0014] Also, selecting the combination must be done within a fixed time limit so that the system can boot or start other processes. It is infeasible to test every combination of TX coefficients to find the best one, as this approach usually takes too much time. Testing only some of the TX coefficients is not preferred as it often leads to choosing a sub-optimal combination. Therefore, there is a need in the art for a technique to test and select optimal TX coefficients for high speed links in a more efficient manner. ...

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Abstract

Techniques for improving high-speed communications in a computing system are provided. In a computing system, various components / devices communicate with each other. For example, a microprocessor maycommunicate with a memory or may communicate with another microprocessor over a link. Various factors such as the frequency and transmission speed of a signal can distort what is being communicated over a link. The problem becomes more pronounced as the transmission speed increases. To address this problem, devices on both ends of a link can cooperate to equalize the link. Equalization involves configuring the transmitting device to alter the signal being transmitted so that certain distortions introduced during transmission are negated by the time the signal arrives at the receiving device. Given that each link can have slightly different characteristics, appropriate equalization parameters need to be ascertained for each link. Introduced herein are improved techniques for performing equalization that are quick yet provide equalization parameters that are stable even in a noisy high-speed link.

Description

technical field [0001] The present application relates generally to transmitter equalization and, more specifically, to finding optimal transmitter parameters for communications over high-speed interconnects. Background technique [0002] A link is a communication channel that connects devices of a single or multiple computing systems and allows them to communicate with each other. Various factors such as the signal's frequency content, transmission speed, and type of chip, link, and channel can affect signal quality and, in some cases, make the signal illegible to the device on the receiving end. One technique to address this problem is to "equalize" the channel so that the frequency-domain properties of the signal at the input are faithfully reproduced at the output, thereby reducing errors. Santa Clara, California High-speed interconnects from companies such as PCIe (especially Gen 5), USB, and NVLink TM , using an equalizer to prepare the data signal for transmission...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04B17/10
CPCH04L25/0264H04L25/028H04B17/10H04L25/0212H04L25/03057H04L25/03343H04L25/03885
Inventor E·泰森M·莫宾V·巴兰H·达特
Owner NVIDIA CORP