National Semiconductor DP83640 Precision PHYTER User manual

10/100 Mb/s Ethernet Products
DP83640 Precision PHYTER
IEEE 1588 Precision Time Protocol Transceiver
Demo Board User Guide
Interface Division
April 25, 2011
Document Revision C

Table of Contents
1General Description.................................................................................................................. 1
2Quick Start................................................................................................................................ 2
2.1 Power Connection...................................................................................................... 2
2.1.1 MII Interface (Default) ................................................................................................ 2
2.1.2 USB Interface............................................................................................................. 2
2.1.3 External Supply.......................................................................................................... 2
2.2 Address Setting.......................................................................................................... 3
2.3 Device Register Access ............................................................................................. 4
2.3.1 Access MDIO Through MII ........................................................................................ 4
2.3.2 Access MDIO Through USB ...................................................................................... 4
2.3.3 Access MDIO Through Parallel Port.......................................................................... 4
2.4 Clock Sources............................................................................................................ 5
2.4.1 Crystal (Default) ......................................................................................................... 5
2.4.2 Oscillator .................................................................................................................... 5
2.5 Straps......................................................................................................................... 6
2.6 LEDs .......................................................................................................................... 7
2.7 SMA Connectors........................................................................................................ 8
2.8 Table of Jumpers ....................................................................................................... 9
2.9 Modification for Fiber Operation .............................................................................. 10
2.10 Register Access Software........................................................................................ 10
2.11 Board Revision Differences ..................................................................................... 11

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DP83640 DEMO BOARD USER GUIDE
1 General Description
The purpose of the DP83640 Demo Board is to provide National Semiconductor Corp.'s
customers with a vehicle to quickly design and market systems containing the DP83640.
Customers are encouraged to copy EVK components to expedite their design process.
The EVK contains:
• DP83640 Demo Board
• USB cable
• Cover letter
• DP83640 Demo licensing agreement
Links to the EVK design files and this User Guide can be found via the DP83640 product folder
on the National Semiconductor website (www.national.com).
This document also highlights the differences between the different revisions of the DP83640
Demo Board.

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DP83640 DEMO BOARD USER GUIDE
2 Quick Start
The DP83640 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 DP83640 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.
2.1.1 MII Interface (Default)
To allow the board to be supplied by the MII interface a 0 ohm resistor must be inserted at R139.
Placing the jumper between J11 and pin 2 of J12 will connect the 3.3 V power plane to the MII
3.3V supply. In the case of an MII interface that supplies 5.0 V, an on board 3.3 V regulator is
provided and no jumper should be placed on J55. For a 3.3 V MII supply, a jumper should be
placed on J55 to bypass the regulator. In both cases, LED D2 will illuminate if a voltage is
available at J11. The following image shows the default jumper configuration.
Figure 1. Default Power Supply Connection
2.1.2 USB Interface
To supply the device using the USB interface, a jumper should be placed between pins 2 and 3 of
J12.
2.1.3 External Supply
The board can be supplied from an external supply by removing the jumper on J12 and
connecting the external 3.3 V supply directly to pin 2 of J12. Ground can be connected to one of
the GND pins on the board.

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DP83640 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)
PHYAD0 (J24)
PHY Address
Open
Jumpered
0
Open
Open
1 (Default)
Jumpered
Jumpered
2
Jumpered
Open
3
Figure 2. Default PHY Address Setting

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DP83640 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.
2.3.3 Access MDIO Through Parallel Port
To access the device registers through the parallel port of the PC, the jumpers on J3 and J4 must
be removed. Figure 4 shows the connection between the parallel port and the device signals:
MDIO (J4, 2), MDC (J3, 2), and GND (J22, 1).
Figure 4. Direct Connect Cable with Line Resistors

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DP83640 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.
2.4.2 Oscillator
To use the board with a 25 MHz oscillator, remove the crystal (Y2) and resistors R22 and R25,
populate the oscillator (X1) and R27 with a 0 ohm resistor. The board will accept oscillators in
both full and half can package sizes.
For Reduced MII mode, two modes of operation are supported (RMII Master Mode and RMII
Slave Mode). For RMII Master Mode, the DP83640 internally generates the 50 MHz RMII
reference clock from the 25 MHz XTAL. For RMII Slave Mode operation, an external 50 MHz
oscillator must provide the reference to the X1 input of the DP83640. Refer to the DP83640
datasheet for details on configuring the device for RMII Master and Slave Modes.

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DP83640 DEMO BOARD USER GUIDE
2.5 Straps
The DP83640 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. Strap Settings
Jumper
Signal Name
IC Pin Name
Function
Default Setting
J23
MII_MODE
RX_DV
MII Mode Select
Open
J29
RMII_MAS
TXD_3
RMII Master Enable
Open
J25
LED_CFG
CRS/CRS_DV
LED Configuration
Open
J32
CLK_OUT_EN
GPIO1
CLK_OUT Enable
Open
J35
PCF_EN
GPIO2
PHY Control Frame Enable
Open
J33
ACT
LED_ACT
Sets Mode in Auto Negotiation
High
J36
SPEED
LED_SPEED
Sets Mode in Auto Negotiation
High
J39
LINK
LED_LINK
Auto-Negotiation Enable
High
R46
FX_EN_Z
RX_ER
Fiber Mode Enable
Open
PHY Address
J24
PHYAD0
COL
PHY Address Bit 0
Open
J26
PHYAD1
RXD_3
PHY Address Bit 1
Open
R47
PHYAD2
RXD_2
PHY Address Bit 2
Open
R49
PHYAD3
RXD_1
PHY Address Bit 3
Open
R50
PHYAD4
RXD_0
PHY Address Bit 4
Open
Refer to the DP83640 datasheet for specific details related to each strap option. The position of
the default strap settings are indicated below for each version of the board.
Table 3. Default Strap Locations and LED Differences per Board Revision
Revision 1
Revision 2
Revision 3

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DP83640 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 4 and Table 5 clarify the relationship between the LEDs and Jumpers.
Table 4. List of LEDs with Jumpers
LED
Associated Jumper
Function
Revision 1
Revision 2
Revision 3
D1
Interrupt Indication
D2
MII Power Supply Indication
D13
D13 / D21
D13 / D33
J42
GPIO8
D10
D10 / D19
D10 / D30
J39
Link (GPIO7)
D7
D7 / D17
D7 / D27
J36
Speed (GPIO6)
D4
D4 / D15
D4 / D24
J33
Activity (GPIO5)
D12
D12 / D20
D12 / D32
J41
GPIO4
D9
D9 / D18
D9 / D29
J38
GPIO3
D6
D6 / D16
D6 / D26
J35
GPIO2
D3
D3 / D14
D3 / D23
J32
GPIO1
Revision 1 and 2
Revision 3
Table 5. LED/Jumper Order
LEDs can be used to indicate the state of GPIOs 1 through 8. When it is desired that the LED is
“ON” when the GPIO is “LOW”, the associated jumper should be set to the “UP” state. With this
setting a GREEN LED will be illuminated. When it is desired that the LED is “ON” when the GPIO
is “HIGH”, the associated jumper should be set to the “DN” state. In this case, an AMBER LED
has been incorporated in the circuit. Care should be taken when selecting the LED polarity of
the GPIO which also function as strap inputs.

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DP83640 DEMO BOARD USER GUIDE
Refer to Table 3 for the “UP” and “DN” jumper position for each board revision. Note that on
Revision 2 of the board, two separate LEDs have been used.
For additional information about the functionality of pins connected to the LEDs (with the
exception of D2), refer to the DP83640 datasheet.
2.7 SMA Connectors
For convenience, two SMA connectors are provided (J2 and J34). J2 can be connected to the
CLK_OUT pin by placing a 0 ohm resistor at R1. Similarly, J34 can be connected to GPIO9 by
placing a 0 ohm resistor at R86. 50 ohm resistors can be placed at R2 and R62 to provide a
terminating impedance for test equipment, if desired.