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Method for auto selection for sensing and switching between link modes dynamically

IP.com Disclosure Number: IPCOM000016500D
Publication Date: 2003-Jun-25
Document File: 2 page(s) / 93K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for auto selection for sensing and switching between link modes dynamically. Benefits include improved performance.

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Method for auto selection for sensing and switching between link modes dynamically

Disclosed is a method for auto selection for sensing and switching between link modes dynamically. Benefits include improved performance.

Background

              InfiniBand Architecture is an industry standard, channel-based, switched fabric, interconnect architecture for servers. The InfiniBand Architecture Specification Volume 2 Release 1.0 is dated 10/24/2000. The specification is copyrighted by the InfiniBand Trade Assn. The name InfiniBand is a trademark of the InfiniBand Trade Assn. 

              Conventionally, lane width selection is not performed. The state machine in the Volume 2 specification describes how to bring up the link, but contains no inference on how to deal with multiple link widths. 

              The conventional design is x1 mode only. The initial solution is to switch statically via a register.

General description

              The disclosed method is dynamic switching of lane width between modes. For example, links may function in two width modes, x1 and x4. The method includes techniques for changing from 1x to 4x and 4x to 1x. 

Advantages

              Some implementations of the disclosed structure and method provide one or more of the following advantages:

•             Improved performance due to dynamically linking in the widest mode

Detailed description

              The disclosed method resolves how to deal with multiple size link widths dynamically (see Figure 1). The device first...