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LAN8742Ai-CZ Datasheet(PDF) 35 Page - Microchip Technology |
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LAN8742Ai-CZ Datasheet(HTML) 35 Page - Microchip Technology |
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35 / 124 page  2013-2015 Microchip Technology Inc. DS00001989A-page 35 LAN8742A/LAN8742Ai In some system architectures, a 25 MHz clock source is available. The device can be used to generate the REF_CLK to the MAC as shown in Figure 3-9. It is important to note that in this specific example, only a 25 MHz clock can be used (clock cannot be 50 MHz). Similar to the 25 MHz crystal mode, the nINT function is disabled. FIGURE 3-9: SOURCING REF_CLK FROM EXTERNAL 25 MHZ SOURCE LAN8742A/LAN8742Ai 10/100 PHY 24-VQFN RMII TXP TXN Mag RJ45 RXP RXN XTAL1/CLKIN XTAL2 TXD[1:0] 2 RXD[1:0] CRS_DV 2 RMII LED[2:1] 2 Interface MDIO MDC nRST TXEN REFCLKO MAC Capable of accepting 50 MHz clock RXER 25 MHz Clock REF_CLK Note: nINT is not available on the REFCLKO/nINT pin in this configuration. nINT can be made optionally available via the LED1 or LED2 pin. |
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