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82562EZ Datasheet(PDF) 61 Page - Intel Corporation |
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82562EZ Datasheet(HTML) 61 Page - Intel Corporation |
61 / 66 page 82562EZ(EX)/82547GI(EI) Dual Footprint Design Guide 53 A.4 Indirect Frequency Measurement and Frequency Accuracy Calculation Steps 1. Make sure the system BIOS has the LAN controller enabled. 2. Connect the test equipment as shown in Figure 11. 3. Using the appropriate controls for your model of high resolution digital counter, make sure it can display ~125.0000 MHz with at least four decimal places frequency resolution. 4. Enable the 125 MHz buffered reference clock. An example can be found in Appendix B, “GigConf.exe Register Settings for 82547GI(EI) Devices”. 5. Determine the center reference frequency as accurately as possible. This can be done by taking 30 to 50 different readings using the frequency counter and then calculating the average results of the readings. 6. Calculate the accuracy of the measured and averaged center frequency with respect to an ideal 125.0000 MHz reference frequency. where x = Average measured frequency in Hertz and y = Ideal reference frequency in Hertz Example 1. Given: The measured averaged center frequency is 124.99942 MHz (or 124,999,420 Hertz). FrequencyAccuracy ppm () xy – () y 1000000 ⁄ () -------------------------------- = FrequencyAccuracy ppm () 124999420 125000000 – () 125000000 1000000 ⁄ () ---------------------------------------------------------------- 4.64ppm – = = |
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