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EVB8740/EVB8741 Evaluation Board User Manual
Copyright © 2013 SMSC or its subsidiaries. All rights reserved.
Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete information sufficient for
construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC
reserves the right to make changes to specifications and product descriptions at any time without notice. Contact your local SMSC sales office to obtain the latest specifications
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version of SMSC's standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects or errors
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SMSC EVB8740/EVB8741
Revision 1.0 (04-29-13)

USER MANUAL

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Summary of Contents for Microchip Technology EVB8740

  • Page 1: User Manual

    Standard Microsystems Corporation (“SMSC”). Product names and company names are the trademarks of their respective holders. The Microchip name and logo, and the Microchip logo are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.
  • Page 2: Pin Connector

    Interface (MII) MAC controller to the LAN8740A/LAN8741A Ethernet MII PHY via a standard 40-pin MII connector. The LAN8740A/LAN8741A is connected to an RJ45 Ethernet jack with integrated magnetics for 10/100 connectivity. A simplified block diagram of the EVB8740/EVB8741 can be seen Figure 1.1.
  • Page 3: Board Details

    Power is normally supplied to the EVB8740/EVB8741’s +3.3V regulator externally via the +5V power pins of the MII connector. If desired, the EVB8740/EVB8741 can be powered without +5V present on the MII connector by supplying +5V to the TP2 (red) test point with ground connected to the TP4 (black) test point.
  • Page 4 The EVB8740/EVB8741 allows the user to configure the default PHY address at power-up via the PHYAD[2:0] configuration straps. Table 2.1 details the proper configuration required for each PHY address value. By default, all EVB8740/EVB8741 PHY address straps are configured to a value of “0”. Table 2.1 PHYAD[2:0] Resistor Configuration PHYAD[2:0] PULL-UP/DOWN RESISTORS PHYAD[2:0]...
  • Page 5 Populate Depopulate 2.2.2 Reset Mode Configuration The EVB8740/EVB8741 can be configured to reset into a specific mode of operation at power-up via the MODE[2:0] configuration straps. Table 2.2 details the proper configuration required for each mode. By default, all EVB8740/EVB8741 MODE[2:0] straps are configured to a value of “1”.
  • Page 6: Clock Configuration

    (Interrupt) Mode and TXER/TXD4 Mode. TXER is also used in EEE mode as TXER when TXEN = 1, and LPI when TXEN = 0. The nINTSEL configuration strap is used to select one of these two modes. The EVB8740/EVB8741 must be properly configured for each mode as follows: nINT Mode Depopulate R46.
  • Page 7: Test Points

    EVB8740/EVB8741 Evaluation Board User Manual External Clock The EVB8740/EVB8741 can be configured to use an external clock by removing crystal Y1 and resistor R20. A 25MHz +3.3V signal may then be applied to pin 1 of Y1 (which connects to pin 5 of the LAN8740A/LAN8741A).
  • Page 8 EVB8740/EVB8741 Evaluation Board User Manual 2.2.8 System Connections Table 2.5 System Connections PLUG/HEADER DESCRIPTION PART RJ45 with Integrated LEDs Pulse J0011D01BNL 2x14 MII Header Adam Tech PH2-28-U-A Note: Refer Table 2.6 to for a full pin list 40-pin Female MII Connector...
  • Page 9 EVB8740/EVB8741 Evaluation Board User Manual Table 2.7 P1 - 40-Pin Female MII Connector Pinout DESCRIPTION DESCRIPTION DESCRIPTION DESCRIPTION TXER (Note 2.5) MDIO TXCLK TXEN RXD3 TXD0 RXD2 TXD1 RXD1 TXD2 RXD0 TXD3 RXDV RXCLK RXER Note 2.5 To use the TXER signal from the MAC, the nINT/TXER/TXD4 pin and R46 must be configured properly.
  • Page 10: Top View

    EVB8740/EVB8741 Evaluation Board User Manual Mechanicals Figure 2.2 details the EVB8740/EVB8741 mechanical dimensions. 0.175 0.200 Ø0.125 TOP VIEW Ø0.125 0.200 0.175 3.000 Figure 2.2 EVB8740/EVB8741 Mechanicals Revision 1.0 (04-29-13) SMSC EVB8740/EVB8741 USER MANUAL...
  • Page 11 EVB8740/EVB8741 Evaluation Board User Manual 3 User Manual Revision History Table 3.1 Customer Revision History REVISION LEVEL & DATE SECTION/FIGURE/ENTRY CORRECTION Rev. 1.0 (04-29-13) Initial release. SMSC EVB8740/EVB8741 Revision 1.0 (04-29-13) USER MANUAL...
  • Page 12 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Microchip EVB8740...

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