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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LXT971ABC датащи(PDF) 34 Page - Intel Corporation |
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LXT971ABC датащи(HTML) 34 Page - Intel Corporation |
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34 / 90 page  LXT971A 3.3V Dual-Speed Fast Ethernet Transceiver 34 Datasheet Document #: 249414 Revision #: 002 Rev. Date: August 7, 2002 3.6.7 Loopback The LXT971A provides two loopback functions, operational and test (see Table 10). Loopback paths are shown in Figure 13. Figure 10. 10BASE-T Clocking Figure 11. 100BASE-X Clocking Figure 12. Link Down Clock Transition RX_CLK (Sourced by LXT971A) 2.5 MHz during auto-negotiation and 10BASE-T Data & Idle TX_CLK (Sourced by LXT971A) 2.5 MHz during auto-negotiation and 10BASE-T Data & Idle Constant 25 MHz XI RX_CLK (Sourced by LXT971A) 2.5 MHz during auto-negotiation TX_CLK (Sourced by LXT971A) Constant 25 MHz XI 25 MHz once 100BASE-X Link Established 2.5 MHz during auto-negotiation 25 MHz once 100BASE-X Link Established Any Clock 2.5 MHz Clock Clock transition time will not exceed 2X the nominal clock period: 10 Mbps = 2.5 MHz 100 Mbps = 25 MHz Link-Down Condition/Auto-Negotiate Enabled RX_CLK TX_CLK |
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