0/100 Mb/s Ethernet Products DP83620 Ethernet Physical Layer Transceiver Demo Board User Guide Interface Division April 21, 2011 Document Revision A
Table of Contents 1 2 General Description .................................................................................................................. 1 Quick Start ................................................................................................................................ 2 2.1 Power Connection...................................................................................................... 2 2.1.1 MII Interface (Default) ......................................................
DP83620 DEMO BOARD USER GUIDE 1 General Description The purpose of the DP83620 Demo Board is to provide National Semiconductor Corp.'s customers with a vehicle to quickly design and market systems containing the DP83620. Customers are encouraged to copy EVK components to expedite their design process.
DP83620 DEMO BOARD USER GUIDE 2 Quick Start The DP83620 Demo Board is fully assembled and factory tested. Follow the instructions below to set up the hardware platform for the measurement of interest. 2.1 Power Connection The DP83620 Demo Board provides several options for supplying power to the board. Power can be supplied by way of the MII interface at 3.3 V or 5.0 V, USB interface, or directly from an external supply. 2.1.
DP83620 DEMO BOARD USER GUIDE 2.2 Address Setting The PHY address can be set by placing jumpers in J24 and J26 as indicated in Table 1. Placing 2.2k ohm resistors in R47, R49, and R50 will pull PHYAD2, PHYAD3, and PHYAD4 high allowing for PHY addresses greater than 3. The default address is 1 (no jumpers or resistors placed). Table 1. PHY Address Settings PHYAD1 (J26) Open Open Jumpered Jumpered PHYAD0 (J24) Jumpered Open Jumpered Open PHY Address 0 1 (Default) 2 3 Figure 2.
DP83620 DEMO BOARD USER GUIDE 2.3 Device Register Access 2.3.1 Access MDIO Through MII To access the device registers through the MII interface jumpers should be placed between pins 1 and 2 of J3 and J4. Figure 3 shows the default jumper settings for the MDIO/MDC access via the MII interface. Figure 3. Default MDIO/MDC Connection 2.3.2 Access MDIO Through USB To access the device registers through the USB interface jumpers should be placed between pins 2 and 3 of J3 and J4. 2.3.
DP83620 DEMO BOARD USER GUIDE 2.4 Clock Sources The board can be configured to operate with either a crystal or an external oscillator. 2.4.1 Crystal (Default) The board comes with a 25 MHz crystal for use in the MII configuration. A surface mount device using the pads provided on the bottom side of the board can replace the through-hole part. 2.4.
DP83620 DEMO BOARD USER GUIDE 2.5 Straps The DP83620 Demo Board provides a combination of jumpers and resistors to configure the strap options for the device. The following table summarizes the straps and the default settings. Table 2.
DP83620 DEMO BOARD USER GUIDE 2.6 LEDs Various LEDs are provided to assist the user in determining the state of operation of the board. Table 3 and Figure 6 clarify the relationship between the LEDs and Jumpers. Table 3.
DP83620 DEMO BOARD USER GUIDE 2.7 SMA Connectors For convenience, SMA connector J2 is provided to allow connection to the CLK_OUT pin. J2 can be connected to the CLK_OUT pin by placing a 0 ohm resistor at R1. A 50 ohm resistor can be placed at R2 to provide a terminating impedance for test equipment, if desired. J34 is unused and reserved. 2.8 Table of Jumpers Table 4.
DP83620 DEMO BOARD USER GUIDE Interface J1 J2 J6 J7 J34 J46 J53 J56 J58 J60 2.
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