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82551QM/ER/IT Fast Ethernet PCI Controller MDI-X Functional Overview

Application Note (AP-472) Revision 1.1 September 2006 Information in this document is provided in connection with Intel products. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Intel's Terms and Conditions of Sale for such products, Intel assumes no liability whatsoever, and Intel disclaims any express or implied warranty, relating to sale and/or use of Intel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. Intel products are not intended for use in medical, life saving, or life sustaining applications. Intel may make changes to specifications and product descriptions at any time, without notice. Designers must not rely on the absence or characteristics of any features or instructions marked “reserved” or “undefined.” Intel reserves thee for future definition and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to them. The 82551QM/ER/IT Fast Ethernet PCI Controller may contain design defects or errors known as errata which may cause the product to deviate from published specifications. Current characterized errata are available on request. Contact your local Intel sales office or your distributor to obtain the latest specifications and before placing your product order. Copies of documents which have an ordering number and are referenced in this document, or other Intel literature may be obtained by calling 1-800- 548-4725 or by visiting Intel's Web site at http://www.intel.com. Intel is a trademark or registered trademark of Intel Corporation or its subsidiaries in the United States and other countries. Copyright © 2006, Intel Corporation. All rights reserved. * Other product and corporate names may be trademarks of other companies and are used only for explanation and to the owners’ benefit without intent to infringe. Application Note (AP-472) 82551QM/ER/IT Fast Ethernet PCI Controller MDI-X Functional Overview Contents 1.0 2.0 3.0 4.0 Figure Introduction and Scope ......................................................................................................1 Connection Types ..............................................................................................................2 MDI/MDI-X Auto-Switching Activation................................................................................3 Design Considerations .......................................................................................................4 1 Typical RJ-45 Cable Connection Types .......................................................................................2 Tables 1 2 3 RJ-45 Connections .......................................................................................................................1 Compatibility Word (03h) ..............................................................................................................3 MDI/MDI-X Control Register Bit Definitions (Register 28, 1Ch)....................................................3 Application Note (AP-472) iii 82551QM/ER/IT Fast Ethernet PCI Controller MDI-X Functional Overview Revision History Revision 1.1 1.0 Revision Date Sept 2006 August 2004 Description Added a note to section 1.0 “Introduction and Scope” that relates to auto- switching. Added a block of 10/100 code to section 4.0 “Design Considerations” that explains how to turn on/off auto MDI-X. Initial release iv Application Note (AP-472) 82551QM/ER/IT Fast Ethernet PCI Controller MDIX Functional Overview 1.0 Introduction and Scope This application note describes the 82551QM/ER/IT Fast Ethernet PCI Controller’s Management Data Interface MDI\MDI-X feature. The MDI/MDI-X feature provides the ability to automatically detect the required cable connection type and configure the controller-side MAU to the cable type. This feature effectively allows all properly wired Ethernet cables, usable with any Ethernet device, to be connected to the 82551QM/ ER/IT without any additional external logic. This advanced feature enables auto-correction Read the full 82551QM/ER/IT Fast Ethernet PCI Controller MDI-X Functional Overview.

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