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RTL8101E-GR Datasheet(PDF) 24 Page - Realtek Semiconductor Corp. |
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RTL8101E-GR Datasheet(HTML) 24 Page - Realtek Semiconductor Corp. |
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24 / 28 page  RTL8101E-GR Datasheet Integrated Fast Ethernet Controller for PCI Express 19 Track ID: JATR-1076-21 Rev. 1.1 7.7. PCI Express Bus Parameters 7.7.1. Differential Transmitter Parameters Table 17. Differential Transmitter Parameters Symbol Parameter Min Typical Max Units UI Unit Interval2 399.88 400 400.12 ps VTX-DIFFp-p Differential Peak to Peak Output Voltage 0.800 1.2 V VTX-DE-RATIO De-Emphasized Differential Output Voltage (Ratio) -3.0 -3.5 -4.0 dB TTX-EYE Minimum Tx Eye Width 0.70 UI TTX-EYE-MEDIAN- to-MAX-JITTER Maximum time between the jitter median and maximum deviation from the median 0.15 UI TTX-RISE, TTX-FALL D+/D- Tx Output Rise/Fall Time 0.125 UI VTX-CM-ACp RMS AC Peak Common Mode Output Voltage 20 mV VTX-CM-DCACTIVE- IDLEDELTA Absolute Delta of DC Common Mode Voltage During L0 and Electrical Idle 0 100 mV VTX-CM-DCLINE- DELTA Absolute Delta of DC Common Mode Voltage between D+ and D- 0 25 mV VTX-IDLE-DIFFp Electrical Idle Differential Peak Output Voltage 0 20 mV VTX-RCV-DETECT The amount of voltage change allowed during Receiver Detection 600 mV VTX-DC-CM The TX DC Common Mode Voltage 0 3.6 V ITX-SHORT TX Short Circuit Current Limit 90 mA TTX-IDLE-MIN Minimum time spent in Electrical Idle 50 UI TTX-IDLE- SETTO-IDLE Maximum time to transition to a valid Electrical Idle after sending an Electrical Idle ordered set 20 UI TTX-IDLE-TOTO- DIFF-DATA Maximum time to transition to valid TX specifications after leaving an Electrical Idle condition 20 UI RLTX-DIFF Differential Return Loss 12 dB RLTX-CM Common Mode Return Loss 6 dB ZTX-DIFF-DC DC Differential TX Impedance 80 100 120 Ω ZTX-DC Transmitter DC Impedance 40 Ω LTX-SKEW Lane-to-Lane Output Skew 500+2 UI ps CTX AC Coupling Capacitor 75 200 nF Tcrosslink Crosslink Random Timeout 0 1 ms Note1: Refer to PCI Express Base Specification, rev.1.0a, for correct measurement environment setting of each parameter. Note2: The data rate can be modulated with an SSC (Spread Spectrum Clock) from +0 to -0.5% of the nominal data rate frequency, at a modulation rate in the range not exceeding 30 kHz – 33 kHz. The +/- 300 ppm requirement still holds, which requires the two communicating ports be modulated such that they never exceed a total of 600 ppm difference. |
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