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LAN8720AI データシート(PDF) 35 Page - SMSC Corporation |
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LAN8720AI データシート(HTML) 35 Page - SMSC Corporation |
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35 / 79 page ![]() Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support Datasheet SMSC LAN8720A/LAN8720Ai 35 Revision 1.4 (08-23-12) DATASHEET In some system architectures, a 25MHz 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 25MHz clock can be used (clock cannot be 50MHz). Similar to the 25MHz crystal mode, the nINT function is disabled. Figure 3.8 Sourcing REF_CLK from a 25MHz Crystal LAN8720A/LAN8720Ai 10/100 PHY 24-QFN RMII TXP TXN Mag RJ45 RXP RXN 25MHz 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 50MHz clock Note: nINT not available in this configuration RXER REF_CLK |
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