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LAN8742Ai-CZ Datasheet(PDF) 33 Page - Microchip Technology |
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LAN8742Ai-CZ Datasheet(HTML) 33 Page - Microchip Technology |
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33 / 124 page  2013-2015 Microchip Technology Inc. DS00001989A-page 33 LAN8742A/LAN8742Ai 3.7.4.1 REF_CLK In Mode In REF_CLK In Mode, the 50 MHz REF_CLK is driven on the XTAL1/CLKIN pin. A 50 MHz source for REF_CLK must be available external to the device when using this mode. The clock is driven to both the MAC and PHY as shown in Figure 3-7. FIGURE 3-7: EXTERNAL 50 MHZ CLOCK SOURCES THE REF_CLK 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 nINT nRST TXEN MAC Accepts external 50MHz clock 50MHz Reference Clock All RMII signals are synchronous to the supplied clock REF_CLK RXER |
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