National Semiconductor DP83640 Precision PHYTER Manual de usuario

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.



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

Open

1 (Default)

Jumpered

Open

Figure 2. Default PHY Address Setting



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



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.



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

Interrupt Indication

MII Power Supply Indication

D13

D13 / D21

D13 / D33

J42

GPIO8

D10

D10 / D19

D10 / D30

J39

Link (GPIO7)

D7 / D17

D7 / D27

J36

Speed (GPIO6)

D4 / D15

D4 / D24

J33

Activity (GPIO5)

D12

D12 / D20

D12 / D32

J41

GPIO4

D9 / D18

D9 / D29

J38

GPIO3

D6 / D16

D6 / D26

J35

GPIO2

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.



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.

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