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LAN8720 Datasheet(PDF) 6 Page - SMSC Corporation |
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LAN8720 Datasheet(HTML) 6 Page - SMSC Corporation |
6 / 79 page Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support Datasheet Revision 1.0 (05-28-09) 6 SMSC LAN8720/LAN8720i DATASHEET List of Figures Figure 1.1 LAN8720/LAN8720i System Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Figure 1.2 LAN8720/LAN8720i Architectural Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Figure 2.1 LAN8720/LAN8720i 24-QFN Pin Assignments (TOP VIEW). . . . . . . . . . . . . . . . . . . . . . . . . 12 Figure 4.1 100Base-TX Data Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Figure 4.2 Receive Data Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Figure 4.3 Relationship Between Received Data and Specific MII Signals . . . . . . . . . . . . . . . . . . . . . . 23 Figure 4.4 External 50MHz clock sources the REF_CLK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Figure 4.5 LAN8720 sources REF_CLK from a 25MHz crystal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Figure 4.6 LAN8720 Sources REF_CLK from External 25MHz Source . . . . . . . . . . . . . . . . . . . . . . . . . 29 Figure 4.7 Direct Cable Connection vs. Cross-over Cable Connection . . . . . . . . . . . . . . . . . . . . . . . . . 32 Figure 4.8 nINTSEL Strapping on LED2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Figure 4.9 REGOFF Configuration on LED1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Figure 4.10 MDIO Timing and Frame Structure - READ Cycle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Figure 4.11 MDIO Timing and Frame Structure - WRITE Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Figure 5.1 Near-end Loopback Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 Figure 5.2 Far Loopback Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 Figure 5.3 Connector Loopback Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 Figure 6.1 SMI Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Figure 6.2 100M RMII Receive Timing Diagram (50MHz REF_CLK IN). . . . . . . . . . . . . . . . . . . . . . . . . 56 Figure 6.3 100M RMII Transmit Timing Diagram (50MHz REF_CLK IN) . . . . . . . . . . . . . . . . . . . . . . . . 57 Figure 6.4 10M RMII Receive Timing Diagram (50MHz REF_CLK IN). . . . . . . . . . . . . . . . . . . . . . . . . . 58 Figure 6.5 10M RMII Transmit Timing Diagram (50MHz REF_CLK IN) . . . . . . . . . . . . . . . . . . . . . . . . . 59 Figure 6.6 100M RMII Receive Timing Diagram (50MHz REF_CLK OUT). . . . . . . . . . . . . . . . . . . . . . . 60 Figure 6.7 100M RMII Transmit Timing Diagram (50MHz REF_CLK OUT) . . . . . . . . . . . . . . . . . . . . . . 61 Figure 6.8 10M RMII Receive Timing Diagram (50MHz REF_CLK OUT). . . . . . . . . . . . . . . . . . . . . . . . 62 Figure 6.9 10M RMII Transmit Timing Diagram (50MHz REF_CLK OUT) . . . . . . . . . . . . . . . . . . . . . . . 63 Figure 6.10 Reset Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 Figure 8.1 Simplified Application Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 Figure 8.2 High-Level System Diagram for Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 Figure 8.3 High-Level System Diagram for Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 Figure 8.4 Copper Interface Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 Figure 8.5 Copper Interface Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 Figure 9.1 LAN8720/LAN8720i-EZK 24-QFN Package Outline, 4 x 4 x 0.9 mm Body (Lead-Free) . . . . 76 Figure 9.1 QFN, 4x4 Taping Dimensions and Part Orientation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 Figure 9.2 Reel Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 |
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