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Intel Ethernet Controllers Timing Device Selection Guide Application Note (AP-419)

Revision 1.2 September 2004 ® 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 these for future definition and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to them. The Intel® product(s) referred to in this document 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. Intel Corporation makes no representation as to the suitability of any third-party products or services described herein. All liability for any such assertions or omissions are hereby disclaimed to the maximum extent of the law. 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. Copyright © 2004, 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-419) Intel Ethernet Controllers Timing Device Selection Guide Revision History Revision 0.3 0.4 1.0 1.1 1.2 Revision Date May 2000 Jun 2000 Sep 2003 Oct 2003 Sep 2004 Description Initial release (Intel Confidential - Controlled Access). Removed Intel Confidential status. Updated for the 8254x controllers. Added Appendix A, “Measuring LAN Reference Frequency Using a Frequency Counter”. Updated Table 1 to reflect new crystal parameters. Added Appendix B, “GigConf.exe Register Settings for 82541GI(EI) and 82547GI(EI)”. Application Note (AP-419) iii Intel Ethernet Controllers Timing Device Selection Guide Note: This page intentionally left blank. iv Application Note (AP-419) Intel Ethernet Controllers Timing Device Selection Guide Contents 1.0 Introduction and Scope ......................................................................................................1 2.0 Frequency Control Component Types ...............................................................................2 2.1 Quartz Crystal .......................................................................................................2 2.2 Fixed Crystal Oscillator .........................................................................................2 2.3 Programmable Crystal Oscillators.........................................................................2 2.4 Ceramic Resonator ...............................................................................................3 3.0 Crystal Selection Parameters.............................................................................................3 3.1 Vibrational Mode ...................................................................................................4 3.2 Nominal Frequency ...............................................................................................4 3.3 Frequency Tolerance ............................................................................................4 3.4 Temperature Stability and Environmental Requirements......................................4 3.5 Calibration Mode ...................................................................................................4 3.6 Load Capacitance .................................................................................................5 3.7 Shunt Capacitance................................................................................................6 3.8 Equivalent Series Resistance................................................................................6 3.9 Drive Level ............................................................................................................6 3.10 Aging .....................................................................................................................6 Appendix A: Measuring LAN Reference Frequency Using a Read the full Intel Ethernet Controllers Timing Device Selection Guide Application Note (AP-419).

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