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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LAN8742Ai-CZ датащи(PDF) 34 Page - Microchip Technology |
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LAN8742Ai-CZ датащи(HTML) 34 Page - Microchip Technology |
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34 / 124 page  LAN8742A/LAN8742Ai DS00001989A-page 34 2013-2015 Microchip Technology Inc. 3.7.4.2 REF_CLK Out Mode To reduce BOM cost, the device includes a feature to generate the RMII REF_CLK signal from a low-cost, 25 MHz fun- damental crystal. This type of crystal is inexpensive in comparison to 3rd overtone crystals that would normally be required for 50 MHz. The MAC must be capable of operating with an external clock to take advantage of this feature as shown in Figure 3-8. In order to optimize package size and cost, the REFCLKO pin is multiplexed with the nINT pin. In REF_CLK Out mode, the nINT functionality is disabled to accommodate usage of REFCLKO as a 50 MHz clock to the MAC. Note: The REF_CLK Out Mode is not part of the RMII Specification. To ensure proper system operation, a timing analysis of the MAC and LAN8742A/LAN8742Ai must be performed. Note: In REF_CLK Out Mode, REFCLKO will not output when the device is in Energy Detect Power-Down Mode or General Power-Down Mode. FIGURE 3-8: SOURCING REF_CLK FROM A 25 MHZ CRYSTAL LAN8742A/LAN8742Ai 10/100 PHY 24-VQFN RMII TXP TXN Mag RJ45 RXP RXN 25 MHz XTAL1/CLKIN XTAL2 LED[2:1] 2 Interface nRST TXD[1:0] 2 RXD[1:0] CRS_DV 2 RMII MDIO MDC TXEN REFCLKO MAC Capable of accepting 50 MHz clock Note: nINT not available in this configuration RXER REF_CLK |
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