ethernet copper-to-fiber media converter reference design for

25MHzXtal

LEDs

PHYADStrap

JTA

G

DP83849Dual

PHYTER

MII/RMII/SNI

MA

GN

ET

ICM

AG

NE

TIC

RJ-45

RJ-45

POE connector

FXTransceiver

LEDs

IntegrityInterface

MII/RMII/SNI

Re

se

t

1TIDU510A–September 2014–Revised July 2016Submit Documentation Feedback

Copyright © 2014–2016, Texas Instruments Incorporated

Ethernet Copper-to-Fiber Media Converter Reference Design for Substation andDistribution Automation

TI DesignsEthernet Copper-to-Fiber Media Converter ReferenceDesign for Substation and Distribution Automation

Design OverviewThis reference design details a methodology to use theDP83849 evaluation board to implement a10/100BASE-TX to 100BASE-FX media converter,which enables copper-based legacy equipment to beeasily connected to a fiber network in gridinfrastructure applications. Copper-based Ethernet(10/100BASE-TX) has been widely used in powersystems automation systems for communication up toa limited distance. When reliable communication isrequired for longer distances or in harsh environments,near breakers or transformers in a substationswitchyard, using fiber optic (FO) interface ispreferable. Using a media converter (copper-to-FO) isthe simplest and more cost-effective solution toconvert the current copper-based Ethernet interface tothe FO interface.

Design Resources

TIDA-00306 Tool Folder Containing Design FilesDP83849I Product FolderDP83849IF Product FolderDP83849IVS-EVK EVM Folder

ASK Our E2E ExpertsWEBENCH® Calculator Tools

Design Features• Single Chip Solution for Copper-to-FO Media

Conversion• Works as Media Converter Without

– Interface to MCU or MPU– Software Programming

• Media Converter Functionality Configured by PinStrapping of I/Os

• Well Suited for Small Size 10/100BASE-TX to100BASE-FX Media Converter

• Same Design Can Be Used as Dual 10/100 CopperEthernet Interface

• Supports Three Configurable LEDs for Link,Activity, and Speed

• Operates From Single 3.3-V Power Supply• Industrial Temperature Rated –40°C to 85°C• Low Power Consumption: < 600 mW for PHYTER

DUAL

Featured Applications• Ethernet-to-Fiber Media Converters• Substation Automation Controllers• Protection Relays• Merging Unit• Terminal Units

http://www.go-dsp.com/forms/techdoc/doc_feedback.htm?litnum=TIDU510A

http://www.ti.com/tool/TIDA-00306

http://www.ti.com/product/DP83849I

http://www.ti.com/product/DP83849IF

http://www.ti.com/product/DP83849IVS-EVK

http://e2e.ti.com

http://e2e.ti.com/

http://e2e.ti.com/support/development_tools/webench_design_center/default.aspx

System Description www.ti.com

2 TIDU510A–September 2014–Revised July 2016Submit Documentation Feedback


Ethernet Copper-to-Fiber Media Converter Reference Design for Substationand Distribution Automation

An IMPORTANT NOTICE at the end of this TI reference design addresses authorized use, intellectual property matters and otherimportant disclaimers and information.

1 System DescriptionSubstation automation and distribution automation are key components in power transmission anddistribution for utilities to reduce cost and improve the utilization of an existing network. Reliablecommunication infrastructure is critical for automation and, at the time of this publication, FO-basedcommunication is currently being used in common applications. Most of the present automation systemshave copper as the standard Ethernet interface port and replacing copper with fiber is expensive. Mediaconverters provide a solution for low-cost Ethernet copper-to-FO conversion. This design uses theDP83849 PHYTER to implement a 10/100BASE-TX to 10/100BASE-FX media converter without amicrocontroller (MCU) interface, which simplifies the design. The media converter enables the copper-based legacy equipment to easily connect to a newer, fiber-based system. The TIDA-00306 TI Designworks with a single 3.3-V power supply. The board has been interfaced to the TIDA-00226 (serial-to-Ethernet converter) for communication and performance testing.

Ethernet Connectivity in Smart GridThe smart grid and automation industry is swiftly adopting ethernet. Ethernet addresses many of therequirements of proprietary buses with the added advantages of widespread usage and lower costs due tohigh volumes.

Why Fiber Optics?Fiber optics (FO) can be found in many applications, ranging from network backbones that power theInternet to manufacturing facilities to subsea communication networks on drilling rigs. The informationcarrying capacity of an optical fiber is far greater than copper wire, coaxial cables, and microwave links.Optical fibers are very small, lightweight, corrosion resistant, and are immune to electrical noise fromlightning storms, electromagnetic interference (EMI), and radio-frequency interference (RFI). In addition,FO cables do not carry electrical energy and are approved for hazardous locations. The cost of FO cable,its associated connectors, and hardware have decreased steadily over the years. Today, the benefits ofFO can far outweigh the costs, making FO communications the preferred choice for smart grid andautomation industry.

Most substations have unique requirements for communications networks that differ from those of acommercial network. These substations must withstand harsher environmental conditions such as extremetemperature ranges, lightning strikes, electromagnetic interference, and hazardous locations. Mountingand space requirements are also an issue because substation networking components must be mountedin the same control panel with other control equipment.

1.1 Why Ethernet over Fiber?If high interference immunity is needed or long transmission distances are involved, then FO cables areadvisable. Another advantage of using FO cabling is the insensitivity to lightning or voltage surges. Theuse of FO-based systems is already established in the process industry, plant engineering, substations,energy distribution, and wind energy. An FO cable is the only medium that can support a virtually limitlessbandwidth. As the demand for more bandwidth grows and the price of fiber declines, fiber is makinginroads where copper has been traditionally used. Ethernet over fiber makes sense because of its lowcost, simplicity and scalability.

1.1.1 SpeedApplications are getting more demanding, web sites are getting more complex, and everything is going tothe cloud—all factors that drive the demand for network bandwidth. To accommodate the high networkspeeds needed to meet this demand, copper cable has evolved in a series of steps from the CAT3 thatcarried 10-Mbps 10BASE-T Ethernet all the way to CAT6a, which can carry 10-Gb 10GBASE-T. UTP hasgone through at least five generations to keep up with increasing bandwidth requirements. On the otherhand, fiber has a much higher innate carrying capacity, so when network speeds increase, fiber canhandle the demand without the need for costly upgrades.

http://www.ti.com


www.ti.com System Description




1.1.2 SecurityFiber is more difficult for hackers to tap into. Because a copper cable “leaks” electromagnetic signals, ahacker can read data nearby without actually touching the cable. A fiber cable, on the other hand, useslight that stays within the cable, so a hacker must physically tap into it to gain access to data. Fiber isimmune to electrical noise such as EMI and RFI caused by items such as transmission lines andtransformers.

1.1.3 DistanceMost common copper Ethernet standards have a maximum segment length of only 328 feet (100 M).Fiber, on the other hand, has distance limitations measured in kilometers, not meters. Although distancesvary, multimode fiber cable routinely supports distances of two kilometers. Single-mode fiber can supportdistances over 10 kilometers, with some implementations going to 80 kilometers or more.

1.1.4 CostAt one time, fiber was universally more expensive than copper. Today, however, because manufacturingcosts are down and terminations are easier, fiber may be less expensive than the equivalent copperinfrastructure.

1.2 Advantages and Disadvantages of Fiber OpticsAdvantages:• Galvanic isolated and robust communication interface• Cabling distance is greater than UTP cable to meet the demand of wide ranges (to communicate over

longer distance) and reduced communication failures• Harsh environment capability: able to withstand EMI, high temperature, high pressure, and high

voltage• No grounding required• Intrinsically safe• Small size and lightweight• Integrated telemetry: fiber itself is a data link• Wide bandwidth• High sensitivity to inputs

Disadvantages:• More challenging to install cable• Must use expensive FO cables and connectors• Needs more expensive optical transmitters and receivers• Cannot carry electricity to operate or power terminal devices

1.3 Physical Media Considerations

1.3.1 Fiber-Optic Standards

Table 1. Standard Fiber-Optic Wavelengths and Modes

WAVELENGTH MODE850 nm Multi-mode1300 nm Multi-mode1310 nm Single-mode1550 nm Single-mode

http://www.ti.com


501259125

125 62.5

Core Cladding





These wavelengths were chosen because they best match the transmission properties of available lightsources with the transmission qualities of optical fiber.

1.3.2 Fiber TypesThree basic fiber media types are:• OM1: 62.5/125 μm graded index multi-mode• OM2: 50/125 μm graded index multi-mode• OM3: 50/125 μm graded index multi-mode• OM4: 50/125 μm graded index multi-mode• OS1: 9/125 μm single-mode

Figure 1. Fiber Media Types

The capability of each fiber in terms of its bandwidth (and distance) is a function of transceiver type andthe optical properties of the fiber used. In general, fiber is commonly used in backbone installations in thefollowing situations:• Faster convergence for network resiliency recovering from faults or changes• Outdoor or between buildings• When the distance is beyond the reach of copper (100 m)• For immunity from EMI

http://www.ti.com


The ST connector forfiber uses a bayonetlocking system.

The SC connector forfiber features a moldedbody and a push-pulllocking system.





Single-mode fiber electronics are much more expensive than multimode equivalents and are generallydeployed in long-distance applications that are beyond the capability of their multi-mode counterparts (seeTable 2). Also, fibers with a smaller multi-mode core size (50 μm versus 62.5 μm) support higherbandwidth and longer distances for applications.

Table 2. Fiber Optics Modes

MULTIMODE SINGLE MODEPROS CONS PROS CONS

• Lower total system cost• Lower cost transceivers• Lower cost connectors• Less complex to terminate

in field

• Higher fiber media cost • Higher bandwidthcapabilities

• Longer distance• Lower fiber media cost

• Higher total system cost• Higher cost transceivers• Higher cost connectors• More complex to

terminate in field

Figure 2. ST and SC Connector Descriptions

1.4 Media Converters: The Migration Tool for Copper-to-Fiber ConnectivityWith the considerable cost and performance advantages of fiber, in theory every network would have acompletely fiber horizontal structure running from a fiber port on a data center switch to a fiber port on aPC. But in practice, copper is often installed simply because it is more familiar. Plus, many networkdevices have copper ports, and organizations cannot afford to replace the most expensive components oftheir networks: the electronics to install fiber.

One simple and inexpensive solution is offered by the media converter. The media converter connects theEthernet through an RJ-45 port to an FO cable port with SC or ST glass fiber connections. Thisconnection retains the collision domain between the two Ethernet participants and means that statustransparency exchanges between the two Ethernet interfaces. The port status multi-mode glass fibersallow distances of up to 5,000 m to be bridged without intermediate repeaters. Single-mode fibers can beused over distances of up to 40 km. Network backbone and long-distance applications have long takenadvantage of FO cable. However, horizontal fiber cabling has been widely regarded as impractical and tooexpensive for an application that doesn’t need to cover long distances or move vast amounts of data.Fiber is regarded as expensive and difficult to install while copper is still the dominant cable type in localnetworks. But times have changed and fiber is gaining an edge over copper, especially for newinstallations, and is now often the first choice even for horizontal cabling, which has traditionally beencopper.

Media converters are the key to integrating fiber into a copper infrastructure, making it possible to migratea local network to fiber while extending the productive life of existing infrastructure. On the most basiclevel, media converters are simple networking devices that make it possible to connect two dissimilarmedia types. Although the most common type of media converter connects UTP to FO cable, mediaconverters may also connect other cable types such as coax. Media converters are often used to connectlegacy Ethernet equipment with copper ports to new fiber cabling. The converters may also be used inpairs to insert a fiber segment into a copper network to increase cabling distance.

http://www.ti.com






1.5 Media Converter Features and OptionsMedia converters may be simple devices, but they come in a dizzying array of types. Newer mediaconverters are often really a switch, which confuses the issue even more. Ethernet media converters areavailable in many configurations, with the most common being UTP to multi-mode or single-mode fiber,although UTP to thin coax (thinnet), UTP to thick coax (standard Ethernet), thin coax to fiber, and UTP toSFP are also available. On the copper side, most media converters have an RJ-45 connector for 10BASE-T, 100BASE-TX connectivity. The fiber side usually has a pair of ST or SC connectors, although newercompact connectors such as LC and MT-RJ are becoming increasingly common.

Media converters may support network speeds from 10 Mbps to 10 Gbps. Traditional media convertersare purely Layer 1 devices that only convert electrical signals and physical media and do not do anythingto the data coming through the link so they’re totally transparent to data. These converters have only twoports—one port for each media type—and support one speed. Some media converters are moreadvanced Layer 2 Ethernet devices that, like traditional media converters, provide Layer 1 electrical andphysical conversion. But unlike traditional media converters, these converters also provide Layer 2services—in other words, they’re really switches. This kind of media converter often has more than twoports, enabling the user to extend two or more copper links across a single-fiber link. These mediaconverters usually feature auto-sensing ports on the copper side, making them useful for linking segmentsoperating at different speeds. The introduction of Layer 2 converters has blurred the line between mediaconverters and switches. The same device may be called a media converter or a switch by differentvendors.

Form FactorMedia converters are available in standalone models that convert between two different media types, inchassis-based models that connect many different media types in a single housing, and in hybrid systemsthat feature standalone modules that also work in a chassis. Standalone converters have their ownenclosure and power supply. These media converters are used individually to convert between two cabletypes. The converters are used either in pairs to extend a network over fiber or as remote units to amodular chassis-based system. Small standalone media converters easily tuck behind a PC to bring fiberto the desktop. These compact converters are ideal for use in small networks and for connecting remotesites but can quickly be outgrown as the network expands.

Chassis-based or modular media converter systems consist of chassis that house media convertermodules. Chassis are usually rack mountable although desktop chassis are also available and providepower to the media converters. Chassis-based media converters are used primarily in data centers whenmany Ethernet segments of different media types need to be connected in a central location. These mediaconverter systems offer great port density, but modules cannot be used on their own without a chassis. Touse an individual module, install it in a compatible chassis. These systems are usually SNMPmanageable.

Chassis systems provide unparalleled flexibility and enable mixing slide-in converters as required. Forexample, when combined with a 10/100/1000 Ethernet switch, LAN administrators can use modularconverters to satisfy a wide range of requirements in network connectivity and distance, converting copperswitch ports to multi-mode or single-mode fiber as needed. Modules in chassis systems can usually hot-swap, enabling quick network changes without taking the chassis offline. Hybrid media converter systemsfeature standalone media converters that can also be used in a rack mount chassis. Although theseblended systems generally do not offer the high-end management features of enterprise-level chassis-based systems, they do offer a great deal of versatility and value because each media converter can beused and reused where it is needed most, whether mounted in a rack in a data center or working as anindividual standalone unit on a desktop.

http://www.ti.com






Power OptionsStandard media converters come with an AC power supply that plugs into a standard wall outlet. It may be120-V AC for domestic U.S. power only or may be an auto-sensing 120 to 240-V AC power supply thatcan be used domestically or easily converted to European power with a simple plug adapter. When mediaconverters are used in areas that do not have convenient power outlets, they may be powered by Powerover Ethernet (PoE), which provides power to network devices over the same Category 5 or higher UTPcable used for data. PoE media converters may also provide power through PoE to a PoE-powered devicesuch as a security camera or wireless AP.

Small standalone media converters intended mainly for fiber-to-desktop applications may be USBpowered, enabling them to draw their power from a PC’s USB port. In chassis-based media convertersystems, media converters or media converter modules draw their power from the chassis, which avoidsthe clutter of individual media converters that must be individually powered. Industrial media convertershave demanding power requirements. Because the power supplied to industrial sites varies greatly,industrial media converters are either sold entirely separately from their power supply or are available witha choice of power supplies. Unlike standard networking devices, industrial media converters often requireyou to select the correct power supply for both device and application.

HardeningHardened, or industrial, media converters are intended for use outdoors or in areas that may be exposedto temperature fluctuations, moisture, dirt, and EMI. Hardened media converters are rated for a specifictemperature range. Temperature tolerances from –13°F to 140°F (–25°C to 60°C) are common, and somemedia converters are rated for extreme temperatures from –40°F to 167°F (–40°C to 75°C). These mediaconverters are usually housed in hardened metal cases that are sealed against contaminants includingparticulates such as airborne dust, moisture, and sometimes chemicals. Conformal coating is a specialfilm or coating applied to electronic circuitry to provide additional protection from contaminants. Hardenedmedia converters are often designed to be DIN rail mounted or have separate brackets for DIN railmounting. Media converters for industrial applications are usually built to withstand higher EMI than thoseintended for office or data center use.

Link Loss Pass ThroughWhen a network device such a switch detects that a link is broken, the Link indicator on its front panelgoes out, alerting the network administrator that the connection is lost. The situation becomes a bit morecomplicated, however, when the switch has a media converter between it and its primary link. In this case,the switch can detect that the link to the media converter is broken but can’t detect a broken link on theother side of the media converter. If the fiber link goes down, the switch does not notice because it still“sees” the media converter.

To counteract this problem, media converters commonly have a feature called link loss pass through,which simply means that the media converter passes the news of a broken link onward. In other words,when either a twisted-pair or a fiber link is broken, the information about this link loss is transferred to theother media link.

http://www.ti.com






1.6 Media Converter ApplicationsFiber is already established for LAN backbone applications, and now fiber is making inroads in horizontalcabling. Fiber carries more data than copper, making it more suitable for high throughput applicationssuch as streaming media and VoIP. Additionally, as the price of copper rises, the price of installing fibercontinues to fall, making it an economical choice as well. Copper-to-fiber media converters help to easethe financial shock of migrating network equipment to fiber. These media converters are a simple,inexpensive solution for matching copper ports to fiber infrastructure. From the data center to the desktop,from the CO to the home, media converters are bringing fiber connectivity to areas where copper has longbeen the medium of choice.

In the data center, media converters extend the productive life of existing copper-based switches,providing a gradual migration path from copper to fiber. Chassis-based media converters mount in racksalongside network switches, enabling the conversion of copper ports on legacy switches to fiber. Mediaconverters can also be used with new copper switches that have fixed RJ-45 ports, which are significantlyless expensive than the equivalent fiber switches. Here, network managers can convert only selectedcopper ports for multi-mode or single-mode fiber as needed, bringing versatility to the data center whilebringing overall costs down.

But factors stand in the way of migrating copper infrastructure to fiber. First of all, there is the familiarityfactor; if an IT staff is familiar with copper, they are likely to continue to install copper even if copper is notthe best choice. Another major factor preventing the migration to fiber is the cost of changing networkdevices out for fiber versions. An enterprise switch is a major investment, and there is also the cost ofadding fiber NICs to desktop PCs as well as other networked devices such as printers and wirelessaccess points.

1.7 Copper-to-Fiber Media Converter with TI DP83849

NOTE: In this TI design, the DP83849 Demo II board is used as the media converter to demonstratecopper and fiber communication. This design has RJ-45 connectors for connecting thecopper inputs and FO transceivers to connect the FO input. Provision to connect the requiredpower supply from an external source is also provided on the EVM. Additionally, jumpers toconfigure the PHYTER™ to function as a media converter without the need for any softwareprogramming has been provided on this board.

Texas Instruments' innovative port switching offers system developers a host of unique, customizablefeatures to meet the needs for specific applications. This novel feature is available in TI's multi-portEthernet chips, starting with the PHYTER dual 10/100 Ethernet physical layer (PHY) transceiver(DP83849). The concept behind flexible port switching is to allow the system developer to configure eachof the internal data paths independently. This approach offers significant advantages over other multi-portphysical layer devices. In particular, the flexible assignment of the ports enables many options notavailable in multi-component PHY designs, including media conversion, cable extension, and portmirroring.

http://www.ti.com


www.ti.com Design Features




2 Design FeaturesThe media converter board (DP83849 Demo II board) features:• Multiple PHY addresses: Defaults are 00h (Port A), 01h (Port B) with increment even values through

30h (Port A) and odd values through 31h (Port B)• Nine LEDs: One power, Two INTERRUPT, and six others (two LINK, two SPEED, two ACT/COL)

dependent on the LED mode selected• Strap options for ports (A and B): ED_EN, MDIX_EN, LED_CFG, and autonegotiation• FX_EN jumper: Port B only• SNI_MODE resistor: Works with MII_MODE pin to set 10-Mb SNI mode. See Section 3.9: Strap

Options of the DP83849IF datasheet for details• MII_MODE resistor: To set RMII mode. See Section 3.9: Strap Options of the DP83849IF datasheet for

details• EXTENDER_EN jumper: To set into Extender mode that DP83849IVS and DP83849IFVS support. See

the DP83849IF datasheet for details• CLK2MAC_DIS jumper: To disable clock to MAC output• RESET_N jumper: To allow external reset• PWR_DWN/INT jumper: To set the device into Interrupt mode

http://www.ti.com


http://www.ti.com/lit/ds/symlink/dp83849if.pdf




25MHzXtal

LEDs

PHYADStrap

JTA

G

DP83849Dual

PHYTER

MII/RMII/SNI

MA

GN

ET

ICM

AG

NE

TIC

RJ-45

RJ-45

POE connector

FXTransceiver

LEDs

IntegrityInterface

MII/RMII/SNI

Re

se

t

Block Diagram www.ti.com




3 Block Diagram

Figure 3. DP83849 Demo Board Block Diagram

The DP83849 demo board is used to test the media conversion. The demo board consists of• Dual Ethernet PHY• LEDs• Jumper settings• Power supply

3.1 DUAL Ethernet PHYThe PHY used as media converter is the DP83849IF. The DP83849IF is a DUAL industrial temperaturePHY with fiber support (FX), which does not need any software conflagration to function as a copper-to-fiber media converter.

3.2 LEDsNine LEDs have been provided on the EVM.

Table 3. Parameters for the LEDs Provided in TIDA-00306

PARAMETER NUMBER OF LEDsPower 1

Interrupt 22 LINK, 2 SPEED, 2 ACT/COL,

dependent on the LED mode selected 6

3.3 Jumper Settings for Media ConverterJumpers have been provided onboard to configure the Ethernet PHY for different functionalities.

3.4 Power SupplyExternal 3.3-V power supply can be applied to the EVM for normal operation.

http://www.ti.com


www.ti.com Circuit Design




4 Circuit Design

4.1 Dual Ethernet PHYThe Dual Ethernet PHY features:• Low-power 3.3-V, 0.18-μm CMOS technology detection• Low power consumption: <600 mW typical• 3.3-V MAC interface and filters• Auto-MDIX for 10/100 Mbps• IEEE 802.3u PCS, 100BASE-TX transceivers• IEEE 802.3u 100BASE-FX fiber interface• Dynamic link quality monitoring• Flexible MII port assignment• Integrated ANSI X3.263-compliant TP-PMD• TDR-based cable diagnostic and cable length physical sub-layer with adaptive equalization detection

and baseline wander compensation• Optimized latency for real-time Ethernet• Programmable LED support for link, 10/100-Mbps operation mode, activity, duplex, and collision• Single register access for complete PHY• SNI interface (configurable) status• MII serial management interface (MDC and MDIO)• 80-pin TQFP package (12×12 mm)

The DP83849IF pins are classified into the following interface (See the DP83849IF datasheet for details):• Serial management interface• MAC data interface• Clock interface• LED interface• JTAG interface• Reset and power down• Strap options• 10/100-Mbps PMD interface• Special connect pins• Power and ground pins

http://www.ti.com



LEDsLEDs JTAG TPRD/FXRD+TPTD/FXTD+

LED

DRIVERS

LED

DRIVERS

MDC MDIO TX RXRXTX

MANAGEMENT

INTERFACE

BOUNDARY

SCAN

PORT BPORT A

10/100 PHY CORE 10/100 PHY CORE

MII MANAGEMENT

INTERFACE

PORT B

MII/RMII/SNI

PORT A

MII/RMII/SNI

TPRD/FXRD+TPTD/FXTD+

100BASE-TX

100BASE-TX

Port A

Port B

Status

LEDs

25 MHzClock

Source

MA

CM

AC

M II/R II/S N IM

M II/R II/S N IM

DP838491F

Typical Application

M P U / C P U

10BASE-FX

10BASE-FX

RJ4

5R

J4

5

Ma

gn

etics

Ma

gn

etics

10BASE-T

or

10BASE-T

or

Circuit Design www.ti.com




Figure 4. Typical Application Using DP83849IF

Figure 5. Function Block Diagram for DP83849IF

4.1.1 Media Converter ConfigurationThe DP83849IF supports both twisted pair (100BASE-TX and 10BASE-T) and fiber (100BASE-FX) media.Each port may be independently configured for twisted pair (TP) or fiber (FX) operation by strap option orby register access.

At power-up or reset, the state of the COL_A and COL_B pins select the media for ports A and B,respectively. The default selection is TP mode while an external pull-up selects FX mode. Strapping a portinto FX mode also automatically sets the far-end fault enable, bit 3 of PCSR (16h), the scramble bypass,bit 1 of PCSR (16h), and the descrambler bypass, bit 0 of PCSR (16h). In addition, the media selectionmay be controlled by writing to bit 6, FX_EN, of PCSR (16h).

http://www.ti.com






4.1.2 LED InterfaceThe DP83849IF supports three configurable LED pins for each port. Several functions can be multiplexedonto the three LEDs using three different modes of operation. The LED operation mode can be selectedby writing to the LED_CFG[1:0] register bits in the PHY Control Register (PHYCR) at address 19h, bits[6:5]. In addition, LED_CFG[0] for each port can be set by a strap option on the CRS_A and CRS_B pins.LED_CFG[1] is only controllable through register access and cannot be set by as strap pin.

Table 4. LED Mode Selection

MODE LED_CFG[1] LED_CFG[0] LED_LINK LED_SPEED LED_ACT/LED_COL

1 Don't care 1 ON for good linkOFF for no link

ON in 100 MbpsOFF in 10 Mbps

ON for activityOFF for no activity

2 0 0 ON for good linkBLINK for activity


ON for collisionOFF for no collision

3 1 0 ON for good linkBLINK for activity


ON for full duplexOFF for half duplex

The LED_LINK pin in Mode 1 indicates the link status of the port. In 100BASE-T mode, a link isestablished as a result of input received amplitude compliant with the TP-PMD specifications, whichresults in internal generation of signal detect. A 10-Mbps link is established as a result of the reception ofat least seven consecutive normal link pulses or the reception of a valid 10BASE-T packet. This receptioncauses LED_LINK to assert. LED_LINK will de-assert in accordance with the link loss timer as specified inthe IEEE 802.3 specifications.

The LED_LINK pin in Mode 1 will be OFF when no link is present. The LED_LINK pin in Mode 2 andMode 3 will be ON to indicate that the link is good and BLINK to indicate activity is present on activity. TheBLINK frequency is defined in BLINK_FREQ, bits [7:6] of register LEDCR (18h).

Activity is defined as configured in LEDACT_RX, bit 8 of register LEDCR (18h). If LEDACT_RX is 0,activity is signaled for either transmit or receive. If LEDACT_RX is 1, activity is only signaled for receive.The LED_SPEED pin indicates a 10- or 100-Mbps data rate of the port. The LED is on when operating in100Mbps mode and off when operating in 10-Mbps mode. The functionality of this LED is independent ofmode selected.

The LED_ACT/LED_COL pin in Mode 1 indicates the presence of either transmit or receive activity. TheLED will be on for activity and off for no activity. In Mode 2, this pin indicates the collision status of theport. The LED will be on for collision and off for no collision. The LED_ACT/LED_COL pin in Mode 3indicates duplex status for 10- or 100-Mbps operation. The LED will be on for full duplex and off for halfduplex. In 10-Mbps half-duplex mode, the collision LED is based on the COL signal. Since these LED pinsare also used as strap options, the polarity of the LED is dependent on whether the pin is pulled up ordown.

http://www.ti.com






4.1.3 Strapped Extender and Media Converter ModeThe DP83849IF provides a simple strap option to automatically configure both channels for extender andmedia converter mode with no device register configuration necessary. The EXTENDER_EN strap can beused in conjunction with the autonegotiation straps (AN_EN, AN0, AN1), the RMII mode strap, and thefiber mode (FX_EN) strap to allow many possible configurations. If extender mode is strapped but RMIImode is not, both channels automatically configure for single-clock MII receive and transmit modes. Theoptional use of RMII mode in conjunction with extender mode allows flexibility in the system design.

Table 5. Common Configuration Modes

MODE AUTONEGOTIATION STRAPS FIBER MODE STRAPS100-Mb Copper Extender Both channels are forced to 100-Mb full duplex Disabled for both channels100-Mb Fiber Extender N/A Enabled for both channels10-Mb Copper Extender Both channels are forced to 10-Mb full duplex Disabled for both channels100-Mb Media Converter One channel is forced to 100-Mb full duplex Enabled for the other channel

4.1.4 Notes and RestrictionsFor an extender and media converter, both channels must be operating at the same speed (10 or 100Mbps). This match can be accomplished by using straps or channel register controls. Both channels mustbe in full-duplex mode. Both channels must either be in RMII mode (RBR:RMII_EN = 1) or full single-clockMII mode (RBR:SCMII_RX = 1 and RBR:SCMII_TX = 1) to ensure synchronous operation. If only one RXto TX path is enabled, SCMII_RX in the RX channel (RBR register 17h bit 7) and SCMII_TX in the TXchannel (RBR register 17h bit 6) must be set to 1. Media conversion is only supported in 100-Mb modes;one channel must be in fiber mode (100Base-FX) and the other channel must be in copper mode(100BASE-TX).

4.2 LEDs

Table 6. LEDs Used in TIDA-00306

FUNCTION LED JUMPER SETTINGPLED_ACT/COL_B D2 J42 Strapped-lowPLED_SPEED_B D3 J43 Strapped-low

PLED_LINK_B D4 J44 Strapped-highPLED_LINK_A D5 J45 Strapped-high

PLED_SPEED_A D6 J46 Strapped-highPLED_ACT/COL_A D7 J47 Strapped-high

http://www.ti.com






4.3 Jumper Settings for Media ConverterTable 7 describes the different jumpers, names, functions and settings for configuring the board for themedia converter.

(1) All blank settings are not applicable.

Table 7. Jumper Settings for TIDA-00306

JUMPER NAME FUNCTION SETTING (1)

AUTONEGOTIATIONJ42 ANEN_B Port B: Enable or disable autonegotiation Strapped-low

J43 AN1_B Port B: Forced or advertised operation modein autonegotiation Strapped-low

J44 AN0_B Port B: Forced or advertised operation modein autonegotiation Strapped-high

J45 AN0_A Port A: Forced or advertised operation modein autonegotiation Strapped-high

J46 AN1_A Port A: Forced or advertised operation modein autonegotiation Strapped-high

J47 ANEN_A Port A: Enable or disable autonegotiation Strapped-highFUNCTION

J40 XTENDER_EN Allow extender mode(For DP83849IVS/IFVS) Strapped

J41 CLK2MAC_DIS Disable clock to MAC outputJ48 PWRDOWN_INT_B Port B: Allow power down and interrupt modeJ49 ED_EN_B Port B: Enable energy detect mode

J50 FX_EN_B Port B: Enable fiber mode(For DP83849IDVS/IFVS) Strapped

J51 MDIX_EN_B Port B: Enable or disable MDIX mode(default enables) Strapped-high

J52 LED_CFG_B Port B: Allow LED configuration.See the DP83849IF datasheet

J55 LED_CFG_A Port A: Allow LED configuration.See the DP83849IF datasheet

J56 MDIX_EN_A Port A: Enable or disable MDIX mode(default enables) Strapped-high

J57 ED_EN_A Port A: Enable energy detect modeJ58 PWRDOWN_INT_A Port A: Allow power down and interrupt modeJ13 PCOL_A Strapped

J92 3V3Remove jumper on connector J92 in case anexternal 3.3-V power has to be applied. Use J13ground pins

http://www.ti.com








4.4 Power SupplyTo apply an external 3.3 V, remove jumper J92 and use pin 1, labeled as 3V3, for (+) and pick the nearestground pin for (-) connections.

Table 8. Power Consumption at 3.3-V Supply

PARAMETERS POWER (mW)Ethernet PHY: Single supply 600

FO: Transmit 600FO: Receive 250

Total 1450

4.5 Fiber-Optic Cords for Ethernet Applications

Figure 6. Fiber-Optic Cords Examples

FO patch cords are ideal for high data-rate systems including FDDI, multimedia, Ethernet backbone, ATM,or any network that requires the transfer of large and time-consuming files.

Features include:• Perfect for use in Ethernet applications• High bandwidth supporting longer distances

Table 9 lists the major specifications:

Table 9. Fiber-Optic Cable Specifications for TIDA-00306

HEADING 1 HEADING 2First connector SC duplex

Second connector SC duplexCable diameter 0.12" (3.0 mm)

Cable type Buffered fiberFiber type 62.5/125

Overall length 16.4' (5.0 m)Type Multimode, duplex

NOTE: The SC connector is an FO connector with a push-pull latching mechanism, which providesquick insertion and removal while also ensuring a positive connection.

http://www.ti.com


1-km

fiber

cableFiberNode

TX

RX

TX

RX

Port BPort A

CAT5

cable

CopperFiber

Switch

www.ti.com Test Setup




5 Test Setup

5.1 Communication Interface Testing (Computer to Device)Media converter mode, shown in Figure 7, allows conversion of copper to fiber and vice-versa at 100Mbps. This configuration allows longer run fiber to be used in situations where fiber support is not built intothe end device. This configuration can also be combined with power over Ethernet on the copper side.

Figure 7. Media Converter Example

Figure 8. DP83849IVS-EVK with Copper and FiberOptions

Figure 9. DP83849IVS-EVK Connected with Fiber-OpticBrick

http://www.ti.com


RXPort B

TX

RXPort A

TX

RX

TX

RX

MAC A

Secondary Link

Primary Link

TX

MAC B

Test Setup www.ti.com




5.2 Media Converter ImplementationThe PHYTER dual incorporates two methods of configuring the extender and media converter mode:through a simple strap option or register control. Note that the definitions of an extender and mediaconverter only differ in their physical (copper or fiber) interfaces; the port swapping is the same. Theoptional use of RMII mode in conjunction with the extender and media converter mode allows flexibility inthe system design.

Figure 10. Media Converter (Strapped)

Several common configurations are shown in Table 10. Note that either single-clock MII or RMII can beconfigured independently from the flexible port mode; however, both ports must be configured to the samecommon-clock mode. Because the EXTENDER_EN strap forces full-duplex mode (includingautonegotiation advertisement), the AN0 (duplex) strap is not shown. If the receive MII ports are to bemonitored, disable the energy detect and power-down modes.

Table 10. Common Strapped Extender and Media Converter Mode Configurations

MODEAUTONEGOTIATION STRAPS FIBER MODE

STRAPS NOTESAN_EN_A AN1_A AN_EN_B AN1_B FX_EN_A FX_EN_B

100-MbCopper

Extender

1 1 1 1 0 0 Advertise 10/100-Mbfull duplex

0 1 0 1 0 0 Force 100-Mb full duplex100-Mb

FiberExtender

Don't care Don't care Don't care Don't care 1 1 No autonegotiation

10-MbCopper

Extender

1 0 1 0 0 0 Advertise 10-Mb full duplex

0 0 0 0 0 0 Force 10-Mb full duplex

100-MbMedia

Converter

Don't care Don't care 1 1 1 0 Port A fiber, B is copperwith autonegotiation

1 1 Don't care Don't care 0 1 Port A is copper withautonegotiation, B is fiber

Don't care Don't care 0 1 1 0 Port A is fiber,B is copper forced

0 1 Don't care Don't care 0 1 Port A is copper forced,B is fiber

http://www.ti.com


www.ti.com Test Results




6 Test ResultsThe media converter interface connectivity tests have been tested as below.

6.1 Ping TestA ping test can be used to determine whether the board can communicate with other devices andcomputers over the Ethernet network and is commonly used to troubleshoot network and LAN cableproblems. Ping uses ICMP protocol to send the request to a target IP address at periodic intervals andmeasure the time it takes for a response to arrive. Ping results can confirm whether the connectionsucceeds or not.

If Ethernet communication is established, the result also displays the communication latency. The latencyresults can vary depending on the network traffic.

Ping test can be invoked from command prompt on windows using the following format:• ping <IP address> <options>

Example: ping 172.168.0.1 –t

This command pings the IP address 172.168.0.1. The option –t is used to ping the IP address repeatedlyand periodically until it is stopped. By default, a ping command invocation sends four requests periodically.

If the ping request does not receive a response, check the Ethernet LEDs.• If the link or activity LEDs do not blink, check if the Ethernet cable is properly inserted.• Ensure that the board (DUT) and test PC have the IP address in the same subnet range.

If an Ethernet switch or hub is used to connect the DUT and test PC, ensure the appropriate link or activityLEDs are glowing.

NOTE: Link LEDs glow when the Ethernet cable is properly inserted.

Activity LEDs glow when there is network traffic. For example, ping can be used to generatethe traffic.

http://www.ti.com


Test Results www.ti.com




6.1.1 Communication Interface Testing (Computer to Device)—Ping TestThe ping test is done while both the boards are setup as Section 5. Network connection settings for pingtest are:1. Go to Network Connections.2. Go to Local Area Connection.3. Right click for Properties.4. Select Internet Protocol Version 4 (TCP/IPv4).5. Go to Properties.6. Select Use the following IP Address.7. Enter the IP address "192.16.0.100" and click on Subnet Mask (It should show 255.255.255.0).8. Click OK.9. Click Close.

Go to Start→Run→Type "cmd"→Type "ping 192.16.0.1" and click Enter. A window similar to Figure 11and show four replies.

Figure 11. Ping Test

The replies from the IP address indicate the interface works well. Because the number of sent andreceived packets is the same, there is no packet loss. Now test this interface with the –t option over aperiod of time to check if there is a packet loss over a period of time.

http://www.ti.com






For continued replies, type “ping 192.16.0.1 –t” and click the Enter key to show the following window andshow continuous replies for the ping (see Figure 12).

Figure 12. Ping Test (for Continuous Replies)

http://www.ti.com






To stop the ping requests, press CTRL+C or close the command prompt window. The command windowshows the following window and the replies are stopped (see Figure 13).

Figure 13. Ping Test Stopped

The results indicate no packet loss and the time to respond is less than or equal to 1 ms.

The data traffic can also be monitored using the Wireshark tool. To begin, open the Wireshark software,select the network Local Area Connection, go to the Capture menu, and click on Start. The window showsthe requests and replies as shown in Figure 14.

Figure 14. Wireshark Results for Data Traffic

The results on a sniffer like Wireshark can be used for troubleshooting and debugging.

http://www.ti.com






6.2 Web Server InterfaceThe web server is used to demonstrate a real application (TCP/IP layer). The web page can be refreshedmanually (F5 key) to reload the web page, thus creating traffic on Ethernet. The ability to invoke traffic onEthernet as and when required can be very useful when performing EMI/EMC tests.

6.2.1 Communication Interface Testing (Computer to Device)—Web Server TestThe web server test is done with the same setup as Section 5. The settings for web server test are:1. Launch Internet Explorer®.2. Go to Tools.3. Click on the Internet Options tab.4. Go to the Connections tab.5. Go to LAN Settings.6. Unclick Use automatic configuration script and click Automatically detect settings.7. Click OK and then OK again.

Type the IP address "http://192.16.0.1/" in the browser and click Enter to show the following window(Figure 15).

Figure 15. Web Server Test

http://www.ti.com






The data traffic can also be monitored using the Wireshark tool. To begin, open the Wireshark software,select the network Local Area Connection, go to Capture menu, and click on Start. The window shows therequests and replies as shown in Figure 16.

Figure 16. Data Traffic Capture for Web Server Test

Each time the page is refreshed, the count on the web page will be incremented. If the refresh count onthe web page does not increase even after pressing F5, check the connectivity.

http://www.ti.com


Do Not Stuff

CLK2MAC

TCK

TDOTRST*

TMSTDI

3V3

3V3

3V3

PFBOUT

PFBOUT

PFBOUT

C70.1uF

C140.1uF

C120.1uF

J4

12

C110.1uF

J90

12

R11.5K

J2

13

24

57

6

108

9

C3

10uF

C90.1uF

C40.1uF

J1A

147

DP83849

U1

123

45

6

7

89

10

11

1213

14151617

18

1920

40

3938

37

3635

34

33

32

31

30

29

28

2726

25

2423

22

21

6059

585756

55

54

53

52

51

5049

48474645 44

434241

61

6263

64

65

6667

68

6970

71

7273747576

77

78

7980

CRS_A/CRS_DV_A/LED_CFG_ARX_ER_A/MDIX_EN_ACOL_A/FX_EN_A

RXD0_A/PHYAD1RXD1_A/PHYAD2

CO

RE

GN

D1

PF

BIN

1

RXD2_A/CLK2MAC_DISRXD3_A/ED_EN_A

IOG

ND

1

IOV

DD

1

TX_CLK_ATX_EN_A

TXD0_ATXD1_ATXD2_ATXD3_A/SNI_MODE_A

PWRDOWN_INT_A

LED_LINK_A/AN0_ALED_SPEED_A/FXSD_A/AN1_A

AN

AG

ND

4

TPRDM_B/FXRDM_BTPRDP_B/FXRDP_B

CD

GN

D2

TPTDM_B/FXTDM_BTPTDP_B/FXTDP_B

PF

BIN

3

AN

AG

ND

3

RBIAS

PF

BO

UT

AN

A3

3V

DD

AN

AG

ND

2

PF

BIN

2

TPTDP_A/FXTDP_ATPTDM_A/FXTDM_A

CD

GN

D1

TPRDP_A/FXRDP_ATPRDM_A/FXRDM_A

AN

AG

ND

1

LED_ACT/COL_A/AN_EN_A

RX_ER_B/MDIX_EN_BCOL_B/FX_EN_B

RXD0_B/PHAD3RXD1_B/PHYAD4RXD2_B/EXTENDER_EN

CO

RE

GN

D2

PF

BIN

4

RXD3_B/ED_EN_B

IOG

ND

2

IOV

DD

2

TX_CLK_BTX_EN_B

TXD0_BTXD1_BTXD2_BTXD3_B/SNI_MODE_B PWRDOWN_INT_B

LED_LINK_B/AN0_BLED_SPEED_B/FXSD_B/AN1_B

LED_ACT/COL_B/AN_EN_B

CRS_B/CRS_DV_B/LED_CFG_B

RX_DV_B/MII_MODE_BRX_CLK_B

IOG

ND

3

IOV

DD

3

MDIOMDC

CLK2MAC

X2X1

RESET_N

TCKTDOTMS

TRSTNTDI

IOG

ND

4

IOV

DD

4

RX_CLK_ARX_DV_A/MII_MODE_A

C20.1uF

C80.1uF

J1B

258

J1C

369

R204.87K 1%

C60.1uF

C150.1uF

RDM_A

PCOL_B

TDP_APRXCLK_A

PLED_SPEED_A

TDP_B

PTXEN_B

PRXDV_A

PRXD3_A

PRXER_A

TDM_B

PCRS_A

PRXD2_B

PTXCLK_A

PTXD2_A

PMDC_A

TDM_A

PTXEN_A

PRXD2_A

PTXD3_B

PTXCLK_B

PWRDOWN_INT_A

RDP_A

PTXD2_B

PRXD0_B

PCOL_A

PRXCLK_B

PWRDOWN_INT_B

RDM_B

PLED_LINK_APRXD1_A

PRXER_B

PRXD3_BPLED_LINK_B

PLED_ACT/COL_A

PRXD0_A

PTXD3_A

PRXD1_B

X2

PLED_ACT/COL_B

P_X1

PCRS_B

PTXD0_B

PTXD1_APTXD0_A

RDP_B

PLED_SPEED_B

PRXDV_B

PTXD1_B

PMDIO_A

MDIOMDC

PMDIO_BPMDC_B

For ANA33VDD (pin 30), IOVDD1 (pin 11),IOVDD2 (pin 51), IOVDD3 (pin 65), IOVDD4 (pin 78)

For PFBIN2 (pin 28), PFBIN3 (pin 34),PFBIN1 (pin 7), PFBIN4 (pin 54)

For PFBOUT (pin 31)

Place capacitors close to device pins.

www.ti.com Design Files




7 Design Files

7.1 SchematicsTo download the schematics, see the design files at TIDA-00306.

Figure 17. Ethernet PHY Schematic

http://www.ti.com



MII_*

MII_6

PMDIO_B

PTXD3_B

PTXEN_B

PCRS_B

PTXD2_B

PRXD1_B

PMDC_B

PRXER_B

PRXDV_BPRXD0_B

PCOL_B

PRXD3_B

PTXD0_B

PRXD2_B

PTXD1_B

PTXCLK_A

PTXD0_A

PTXD2_APTXD1_A

PTXEN_A

PRXD1_A

PMDIO_A

PRXDV_APRXCLK_A

PRXD0_A

PRXER_A

PRXD2_A

PCRS_APCOL_A

PMDC_A

PTXD3_A

PRXD3_A

MII_VDD_A

PRXCLK_B

PTXCLK_B

MII_VDD_B

MII_VDD

J13

13579111315171921232527293133353739

2468

10121416182022242628303234363840

C3133U-7343

J9

CON-MII-MALE

1234567891011121314151617181920

2122232425262728293031323334353637383940

VCC1MDIOMDC

RXD3RXD2RXD1RXD0

RX_DVRX_CLKRX_ERTX_ER

TX_CLKTX_EN

TXD0TXD1TXD2TXD3COLCRS

VCC2

VCC3GND1GND2GND3GND4GND5GND6GND7GND8GND9GND10GND11GND12GND13GND14GND15GND16GND17GND18VCC4

R4333

J8

123

R5233 R53

33

R4733

C2833U-7343

J7

13579111315171921232527293133353739

2468

10121416182022242628303234363840

R5433

C2933U-7343

C3033U-7343

R5033

R4433

J14

CON-MII-MALE

1234567891011121314151617181920

2122232425262728293031323334353637383940

VCC1MDIOMDC

RXD3RXD2RXD1RXD0

RX_DVRX_CLKRX_ERTX_ER

TX_CLKTX_EN

TXD0TXD1TXD2TXD3COLCRS

VCC2

VCC3GND1GND2GND3GND4GND5GND6GND7GND8GND9GND10GND11GND12GND13GND14GND15GND16GND17GND18VCC4

R4533

J10

123

R5133

R4633

PRXD2_A

PRXDV_A

PTXD3_A

PTXCLK_A

PMDC_A

PRXER_A

PRXD1_A

PTXD2_A

PRXD3_A

PTXD1_A

PCOL_A

PRXCLK_A

PRXD0_A

PMDIO_A

PTXD0_APTXEN_A

PCRS_A

PTXD2_B

PTXCLK_B

PRXD1_B

PRXCLK_B

PMDIO_B

PTXD3_B

PRXD2_BPRXD3_B

PTXD1_B

PRXER_B

PMDC_B

PRXD0_B

PCOL_BPCRS_B

PRXDV_B

PTXD0_BPTXEN_B

X1_B

X1_AMII_3V3

MII_5V

Do not populate pull-downon X1_B, pin 21 of J7.

Do not populate pull-downon X1_A, pin 21 of J13.

Design Files www.ti.com




Figure 18. MII Schematic

http://www.ti.com


TXPORT A

RX

V__

RXC_A

RX-_A

RX+_A

TXC_A

GND_CHASSIS

TX-_A

TX+_A

ISLAND_GND

ISLAND_GND

3V3

3V3

3V3

3V3

R237Open

C109

0.001uF

R163

75

TX 1:1

RX 1:1

T2

H2019 (POE)

1

2

3

8

7

6

9

10

11

14

15

16TD+_P

TDC_P

TD-_P

RD-_P

RDC_P

RD+_P

RX-_S

RXC_S

RX+_S

TX-_S

TXC_S

TX+_S

C107

0.1uF

J85

CON-RJ45

12345678

91011121314

TD+TD-RD+NC1NC2RD-NC3NC4

NCNC

SHGND1SHGND2SHGND3SHGND4

R164

75

+

C114

10uF

R14449.9

C88

1500pF

C110

0.001uF

R227

Open

R14549.9

R14349.9

C60

0.1uF

R228

Open

C57

0.1uF

R161

75

R229

Open

C590.1uF

R236165

R226

Open

R14649.9

C108

0.1uF

C560.1uF

D10LTM673

21

R238Open

J91

POE Connector

1234567

R162

75

TDM_A

TDP_A

RDM_A

RDP_A

RXC_B

TXC_B

Note:If using PoE switch, use port A.The operation also requires baby board (to that effect).

Place capacitors and resistorsclose to DP83849.

Place capacitors close tothe transformer center taps.

Note: Void power and ground planesunderneath the transformer.

Place these resistorsclose to TXC_A, RXC_A,NC1 to NC4 traces.

Do not populate,0-ohm resistors.

Remove R161 to R164 when R226 to R229(0-ohm values) are used.

Place oneitherside ofRJ-45connector.

Chassis GroundFor magnetic:— Use H1102 for normal application— Use H2019 for PoE application





Figure 19. Port A TP Schematic

http://www.ti.com


FXTD-_B

FXTD+_B

FXRP_B

FXRD-_BFXRM_B

FXTP_B

FXTM_B

FXRD+_B

FXSD_B

3V33V33V33V33V3

R168130

C940.1uF

R167130

J89

HFBR-58031

2

3

4

5

6

7

8

9

RX

_V

eeRD+

RD-

SD

RX_Vcc

TX_Vcc

TD-

TD+

TX

_V

ee

R21880

R18480 C93

0.1uF

R2390

R217130

R18780

L1

1uH1 2

L2

1uH1 2

R1790

R18880

R172130

R1740

R1750

R16650

C89

0.1uF

R182Open

C920.1uF

R16550

R169Open

R181Open

+C91

10uF

C90

0.1uF

R170Open

R1780

R186Open

R171130

R18380

R185Open

TDM_B

RDP_B

RDM_B

PLED_SPEED_B

TDP_B

CRDP_B

CTDM_B

CRDM_B

CTDP_B

Note:— For fiber operation, populate all items on this page.— For copper operation, do not populate all items on this page.

Important note:— R174, R175, R179, R239 are to be routed on bottom.

Place capacitors andresistors close to DP83849.

Place capacitors,inductors, andresistors close totransceiver.





Figure 20. Port B FX Schematic

http://www.ti.com


PORT BTX

RX

ISLAND_GND

RX-_B

TXC_B

RX+_B

RXC_B

TX+_B

GND_CHASSIS

TX-_B

ISLAND_GND

3V33V3

3V3

R13849.9

R159

75

R1760

R160

75

R1770

C540.1uF

R158

75

R13549.9

C55

0.1uF

C106

0.001uF

R157

75

C87

1500pF

C520.1uF

R13649.9

C104

0.1uF

RX 1:1

TX 1:1

T1

H2019 (POE)

1

2

3

8

7

6

9

10

11

14

15

16RD-_P

RDC_P

RD+_P

TD+_P

TDC_P

TD-_P

TX+_S

TXC_S

TX-_S

RX+_S

RXC_S

RX-_S

C105

0.001uF

C53

0.1uF

R1800

R13749.9

J84

CON-RJ45

12345678

91011121314

TD+TD-RD+NC1NC2RD-NC3NC4

NCNC

SHGND1SHGND2SHGND3SHGND4

C103

0.1uF

R1730

CTDP_B

CRDM_B

CRDP_B

CTDM_B

RXC_B

TXC_B

Note:If using PoE switch, use port A.The operation also requires baby board (to that effect).

Place oneitherside ofRJ-45connector.

Place capacitors close tothe transformer center taps.

Note: Void power and ground planesunderneath the transformer.

For magnetic:— Use H11202 for normal application.— Use H2019 for PoE application.

Chassis Ground

Important note:— R173, R176, R180 are to be routed on top.

Place capacitors and resistorsclose to DP83849.





Figure 21. Port B TP Schematic

http://www.ti.com


uMDIO

D

D

BUSY

MII_3V33V3_LP3964

3V3

3V3

3V3

3V3

3V3

3V3

3V3

R233

33

U4

NC7SZ126

2

4

51

3

+

C4033uF

U3LP3964 - 3.3V - 800mA

3

4

2

1

5

Vout

Sense

Vin

SD GN

D

J23

12

J93

13579

2468

10

J92

12

C33

33PF

R6310K

J26

13

24

U6

NC7SZ126

2

4

5 1

3

C111

100nF

U5

NC7SZ126

2

4

51

3

C35

33PF

+

C4168uF

R22510

Y1XTAL - 25M

C112

100nF

R22322

R56Open

R2321200

R22422

R231

100

Oscillator

X1

11

7

814

Vcc

GND

OUTVcc

C113100nF

X1_A

X2

P_X1

X1_B

MII_3V3

MII_5V

MDIOMDC

Integrity Interface

Place this jumperclose to theDP83849.

Note: Do not stuffin RMII configuration.

Clock distribution may be required.

50 MHZ (50 ppm)

Note: Do not stuff inMII configuration.

B6

B7





Figure 22. Power, Clock, and uMDIO Schematic

http://www.ti.com


PHYAD4

PHYAD1

PHYAD3

PHYAD2

EXTENDER_EN

PWRDOWN_INT_B

MII_MODE_B

LED_CFG_B

MDIX_EN_B

FX_EN_B

ED_EN_A

MII_MODE_A

PWRDOWN_INT_A

ED_EN_B

LED_CFG_A

MDIX_EN_A

LED_SPEED_B

ANEN_B

LED_ACT/COL_B

LO

AN0_B

LED_LINK_B

LO

HI

LO

AN1_B

HI

LED_LINK_A

LED_ACT/COL_A

AN_EN_A

HI

LO

LO

HI

LED_SPEED_A

AN1_A

AN0_A

HI

LO

Interrupt Port A

Interrupt Port B

SNI_MODE_B

SNI_MODE_A

HI

3V3

3V3

3V3

3V3

3V3

3V3

3V3

3V3

3V3

3V3

3V3

J40

12

R101

Open

R1032.2K

R1292.2K

R86

2.2K

R1182.2K

J43

123

D2

Bicolor-LEDs

3

12

4

R93

2.2K

J57

12

J50

12

D6

Bicolor-LEDs

3

12

4

R95

2.2K

R1202.2K

D3

Bicolor-LEDs

3

12

4

J55

12

J46

123

R91165

R96

Open

R116165

J42

123

R127

2.2K

R105

2.2K

R130165

R114165

J48

12

J36

12

J52

12

R132165

J49

12

J41

12

D7

Bicolor-LEDs

3

12

4

R110

Open

D4

Bicolor-LEDs

3

12

4

R117

2.2K

R89165

R98

2.2K

R872.2K

R1062.2K

R133

2.2K

R109165

J56

12

J47

123

R107165

R88

2.2K

D5

Bicolor-LEDs

3

12

4

R119

2.2K

R1252.2K

R112

Open

R972.2K

R102165

J58

12

R122165

R1342.2K

R128

Open

J37

12

R99165

R92

Open

J44

123

R126

2.2K

D9

Ultra Bright Red

12

R1132.2K

R234210

J45

123

R235210

R104

2.2K

R1112.2K

R149

2.2K

R124165

R942.2K

D8

Ultra Bright Red

12

J51

12

PRXD1_A

PRXD0_B

PRXD0_A

PRXD1_B

PRXD2_A

PRXD2_B

PRXER_A

PCOL_B

PCRS_A

PRXD3_B

PCRS_B

PRXDV_B

PRXER_B

PWRDOWN_INT_B

PRXD3_A

PWRDOWN_INT_A

PRXDV_A

PLED_SPEED_B

PLED_ACT/COL_B

PLED_LINK_B

PLED_LINK_A

PLED_ACT/COL_A

PLED_SPEED_A

PTXD3_B

PTXD3_A

AN_EN

0

0

0

0

AN1

0

0

1

1

A

0

1

0

1

wwN0 AUTO-NEG

10BASE-T

10BASE-T

100BASE-TX

100BASE-TX

FORCED MODES

HALF-DUPLEX

FULL-DUPLEX

HALF-DUPLEX

FULL-DUPLEX

AN_EN

1

1

1

1

A

0

0

1

1

ww A

0

1

0

1

wwN0 AUTO-NEG

10BASE-T

100BASE-T

10BASE-T100BASE-TX

100BASE-TX10BASE-T

ADVERTISED MODES

HALF/FULL-DUPLEX

HALF/

HALF/

FULL-DUPLEX

HALF-DUPLEX

FULL-DUPLEX

HALF-DUPLEX

HALF/FULL-DUPLEX

N1

PHYAD2

001

PHYAD1

010

PORT A

024

PORT B

135

CLK2MAC_DIS





Figure 23. Strap Options Schematic

http://www.ti.com






http://www.ti.com






7.2 Bill of MaterialsTo download the bill of materials (BOM), see the design files at TIDA-00306.

Table 11. BOMITEM INSTALL QTY REFERENCE DESCRIPTION PACKAGE

1 27 C2, C4, C6, C7, C8, C9, C11, C12, C14, C15, C52, C53, C54, C55, C56, C57, C59,C60, C89, C90, C92, C93, C94, C103, C104, C107, C108 0.1 µF, CAP, SMD, Ceramic, 0603 20% 16 V SMD0603-A-1

2 1 C3 10 µF, 7343 SMD, Tan, 20% 25 V SMD07343

3 4 C28, C29, C30, C31 33U-7343 SMD, Tan, 20% 25 V SMD07343

4 2 C33, C35 33 pF CAP, SMD, Ceramic, 0805 10% 50 V SMD0805-A-1

5 1 C40 33 µF, Tantalum, ±10%, 16 V 3528 SMD3528-B-1


7 2 C87, C88 1500 pF CAP, SMD, Ceramic, 1808 10% 2 KV

8 1 C91 10 µF CAP, SMD, Tant, 3528 10% 16 V SMD3528-B-1

9 4 C105, C106, C109, C110 0.001 µF CAP, SMD, Ceramic, 0603 20% 16 V SMD0603-A-1

10 3 C111, C112, C113 100 nF CAP, SMD, Ceramic, 0603, 20%, 16 V SMD0603-A-1


12 6 D2, D3, D4, D5, D6, D7 Bicolor-LEDs 7011X5/7 Digikey L61057CT_ND

13 2 D9, D8 Ultra-Bright Red Panasonic LNJ211R82RA

14 1 D10 LTM673 OSRAM LTM673 Hyper-Bright LED OSRAM/LTM673-R1S2-35

15 1 J1 HDR-3X3 HDR-3X3

16 1 J2 CON2x5_TH CN-HDR2x5

17 17 J4, J23, J36, J37, J40, J41, J48, J49, J50, J51, J52, J55, J56, J57, J58, J90, J92 HDR-1X2 CN-HDR1X2

18 2 J13, J7 HDR-2X20 CN-MII-40P-RA-M

19 2 J8, J10 HDR-1X3 CN-HDR1X3

20 DNP 2 J9, J14 CON-MII-MALE CN-MII-40P-RA-M

21 1 J26 HDR2X2 CN-HDR2X2

22 6 J42, J43, J44, J45, J46, J47 HDR_1X3 CN-HDR1X3

23 1 J85 CON-RJ45 CN-PHONE8P8C-RA-SHLD RJ-45Connector

23a DNP 1 J84 CON-RJ45 CN-PHONE8P8C-RA-SHLD RJ-45Connector

24 1 J89 HFBR-5803 HFBR-5803 SC Connector

25 1 J91 POE Connector Sullins PPPC071LGBN

26 1 J93 HDR2X5 CN-HDR2X5

27 2 L1, L2 1 uH Murata LQM21N Series LQM21NN1R0K10D Ferrite Inductor

28 1 R1 1.5 K, SMD, 0805 1/10 W 1% SMD805-A-1 RES

29 1 R20 4.87 K 1% RES, SMD, 0603 1/16 W 1% SMD0603-A-1

30 10 R43, R44, R45, R46, R47, R50, R51, R52, R53, R54 33 RES, SMD, 0603 1/16 W 5% SMD0603-A-1

31 DNP 7 R56, R92, R96, R101, R110, R112, R128 RES, SMD, 0603 1/16 W 5% SMD0603-A-1

32 1 R63 10 K, RES, SMD, 0603 1/16 W, 5% SMD0603-A-1

33 25 R86, R87, R88, R93, R94, R95, R97, R98, R103, R104, R105, R106, R111, R113,R117, R118, R119, R120, R125, R126, R127, R129, R133, R134, R149 2.2 K RES, SMD, 0603 1/16 W 5% SMD0603-A-1

http://www.ti.com







Table 11. BOM (continued)ITEM INSTALL QTY REFERENCE DESCRIPTION PACKAGE

34 13 R89, R91, R99, R102, R107, R109, R114, R116, R122, R124, R130, R132, R236 165, RES, SMD, 0603 1/16 W 1% SMD0603-A-1

35 8 R135, R136, R137, R138, R143, R144, R145, R146 RES, 49.9 , SMD, 0603 1/16 W 1% SMD0603-A-1

36 8 R157, R158, R159, R160, R161, R162, R163, R164 75 RES, SMD, 0603 1/16 W 1% SMD0603-A-1

37 2 R66, R165 50 RES, SMD, 0603 1/16 W 1% SMD0603-A-1

38 5 R167, R168, R171, R172, R217 130 RES, SMD, 0603 1/16 W 1% SMD0603-A-1

39 DNP 12 R169, R170, R181, R182, R185, R186, R226, R227, R228, R229, R237, R238 RES, SMD, 0603 1/16 W 1% SMD0603-A-1

40 9 R173, R174, R175, R176, R177, R178, R179, R180, R239 0 SRES, SMD, 0603 1/16 W 1% SMD0603-A-1

41 5 R183, R184, R187, R188, R218 80 RES, SMD, 0603 1/16 W 1% SMD0603-A-1

42 2 RR223, R224 22 RES, SMD, 0603 1/16 W 5% SMD0603-A-1

43 1 R225 10 RES, SMD, 0603 1/16 W 5% SMD0603-A-1

44 1 R231 100 RES, SMD, 0603 1/16 W 5% SMD0603-A-1

45 1 R232 1200 RES, SMD, 0603 1/16 W 5% SMD0603-A-1

46 1 R233 33 RES, SMD, 0603 1/16 W 5% SMD0603-A-1

47 2 R234, R235 210 RES, SMD, 0603 1/16 W 5% SMD0603-A-1

48 DNP 1 T1, T2 H2019 (POE) Magnetic Pulse/H1102/H2019 Pulse H1102/H2019

49 1 U1 DP83849 DUAL Industrial Temperature Ethernet PHY with Fiber Support (FX) VHB80A

50 1 U3 LP3964, 3.3 V, 800 mA Voltage Regulator 5-to-3.3 V NSC/LP3964EMP-3.3 SOT223-5

51 3 U4, U5, U6 NC7SZ126 is a single buffer with 3-STATE output SOT223-5

52 DNP 1 X1 50-MHz Oscillator (50 ppm), 3.3 V 50 MHz OSC14-4P

53 1 Y1 XTAL - Crystal, 25.000M 25M HC49-US

54 14J1: 2-3, 5-6, 8-9;J8 MII_5V J23 MII_3V3; J92 MII_3V3 J10: MII_VDD_B J41;J42 HI; J43 HI; J44 HI J45 HI; J46 HI; J47 HI

Jumper 2Pos , 2.54-mm Pitch Jumper setting

http://www.ti.com






http://www.ti.com






Table 12. Evaluation Board Configuration for MII/RMII

OPTION REFERENCE

MII with copper configurationDo not stuff components

X1R223, R224, R225

J90R174, R175, R178, R179, R239

J89

MII with fiber configurationDo not stuff components

X1R223, R224, R225

J90R173, R176, R177, R180

RMII with copper configurationDo not stuff components

Y1C33, C35

J90R174, R175, R178, R179, R239

J89

RMII with fiber configurationDo not stuff components

X1R223, R224, R225

J90R173, R176, R177, R180

http://www.ti.com






NOTE: FO interface cables that can be used for testing are:• A36340-ND 6374039-3 CABLE ASSY SC-SC DUPLEX MM 3M• AE10442-ND DK-2622-05 CABLE FIBER OPTIC DUAL SC-SC

http://www.ti.com






7.3 Layer PlotsTo download the layer plots, see the design files at TIDA-00306.

Figure 24. Top Etch Figure 25. GND

Figure 26. 3V3 Figure 27. Bottom Etch

http://www.ti.com







Figure 28. Top Solder Mask Figure 29. Bottom Solder Mask

Figure 30. Top Silkscreen Figure 31. Bottom Silkscreen

http://www.ti.com






7.4 Gerber FilesTo download the Gerber files, see the design files at TIDA-00306.

7.5 Assembly Drawings

Figure 32. Drill Drawing

8 References

1. AN-1509 PHYTER Dual Flexible Port Switching (SNLA086A)2. Datasheet for DP83849IF PHYTER DUAL Industrial Temperature with Fiber Support (FX) and Flexible

Port Switching Dual Port 10/100 Mbps Ethernet Physical Layer Transceiver (DP83849IF)3. DP83849IVS-EVK Purpose and Contents (SNLU088)

9 About the AuthorKALLIKUPPA MUNIYAPPA SREENIVASA is a systems architect at Texas Instruments where he isresponsible for developing reference design solutions for the industrial segment. Sreenivasa brings to thisrole his experience in high-speed digital and analog systems design. Sreenivasa earned his Bachelor ofElectronics (BE) in electronics and communication engineering (BE-E&C) from VTU, Mysore, India.

http://www.ti.com



http://www.ti.com/lit/pdf/SNLA086A


http://www.ti.com/lit/pdf/SNLU088

www.ti.com Revision History



Revision History

Revision HistoryNOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Changes from Original (September 2014) to A Revision ............................................................................................... Page

• Changed title from Copper-to-Fiber Ethernet Media Converter to Ethernet Copper-to-Fiber Media Converter ReferenceDesign for Substation and Distribution Automation................................................................................... 1

• Changed TI Designs summary to new title Design Overview and updated the description paragraph........................ 1• Changed Design Features to an updated list.......................................................................................... 1• Changed from "10/100BASE-TX to 10/100BASE-FX Media Converter" to "10/100BASE-TX to 100BASE-FX Media

Converter" .................................................................................................................................. 1• Deleted "Pink" from "Pink LEDs" ........................................................................................................ 1• Added descriptive paragraph directly after Section 1 ................................................................................ 2

http://www.ti.com


IMPORTANT NOTICE FOR TI REFERENCE DESIGNS

Texas Instruments Incorporated (‘TI”) reference designs are solely intended to assist designers (“Designer(s)”) who are developing systemsthat incorporate TI products. TI has not conducted any testing other than that specifically described in the published documentation for aparticular reference design.TI’s provision of reference designs and any other technical, applications or design advice, quality characterization, reliability data or otherinformation or services does not expand or otherwise alter TI’s applicable published warranties or warranty disclaimers for TI products, andno additional obligations or liabilities arise from TI providing such reference designs or other items.TI reserves the right to make corrections, enhancements, improvements and other changes to its reference designs and other items.Designer understands and agrees that Designer remains responsible for using its independent analysis, evaluation and judgment indesigning Designer’s systems and products, and has full and exclusive responsibility to assure the safety of its products and compliance ofits products (and of all TI products used in or for such Designer’s products) with all applicable regulations, laws and other applicablerequirements. Designer represents that, with respect to its applications, it has all the necessary expertise to create and implementsafeguards that (1) anticipate dangerous consequences of failures, (2) monitor failures and their consequences, and (3) lessen thelikelihood of failures that might cause harm and take appropriate actions. Designer agrees that prior to using or distributing any systemsthat include TI products, Designer will thoroughly test such systems and the functionality of such TI products as used in such systems.Designer may not use any TI products in life-critical medical equipment unless authorized officers of the parties have executed a specialcontract specifically governing such use. Life-critical medical equipment is medical equipment where failure of such equipment would causeserious bodily injury or death (e.g., life support, pacemakers, defibrillators, heart pumps, neurostimulators, and implantables). Suchequipment includes, without limitation, all medical devices identified by the U.S. Food and Drug Administration as Class III devices andequivalent classifications outside the U.S.Designers are authorized to use, copy and modify any individual TI reference design only in connection with the development of endproducts that include the TI product(s) identified in that reference design. HOWEVER, NO OTHER LICENSE, EXPRESS OR IMPLIED, BYESTOPPEL OR OTHERWISE TO ANY OTHER TI INTELLECTUAL PROPERTY RIGHT, AND NO LICENSE TO ANY TECHNOLOGY ORINTELLECTUAL PROPERTY RIGHT OF TI OR ANY THIRD PARTY IS GRANTED HEREIN, including but not limited to any patent right,copyright, mask work right, or other intellectual property right relating to any combination, machine, or process in which TI products orservices are used. Information published by TI regarding third-party products or services does not constitute a license to use such productsor services, or a warranty or endorsement thereof. Use of the reference design or other items described above may require a license from athird party under the patents or other intellectual property of the third party, or a license from TI under the patents or other intellectualproperty of TI.TI REFERENCE DESIGNS AND OTHER ITEMS DESCRIBED ABOVE ARE PROVIDED “AS IS” AND WITH ALL FAULTS. TI DISCLAIMSALL OTHER WARRANTIES OR REPRESENTATIONS, EXPRESS OR IMPLIED, REGARDING THE REFERENCE DESIGNS OR USE OFTHE REFERENCE DESIGNS, INCLUDING BUT NOT LIMITED TO ACCURACY OR COMPLETENESS, TITLE, ANY EPIDEMIC FAILUREWARRANTY AND ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT OF ANY THIRD PARTY INTELLECTUAL PROPERTY RIGHTS.TI SHALL NOT BE LIABLE FOR AND SHALL NOT DEFEND OR INDEMNIFY DESIGNERS AGAINST ANY CLAIM, INCLUDING BUT NOTLIMITED TO ANY INFRINGEMENT CLAIM THAT RELATES TO OR IS BASED ON ANY COMBINATION OF PRODUCTS ASDESCRIBED IN A TI REFERENCE DESIGN OR OTHERWISE. IN NO EVENT SHALL TI BE LIABLE FOR ANY ACTUAL, DIRECT,SPECIAL, COLLATERAL, INDIRECT, PUNITIVE, INCIDENTAL, CONSEQUENTIAL OR EXEMPLARY DAMAGES IN CONNECTION WITHOR ARISING OUT OF THE REFERENCE DESIGNS OR USE OF THE REFERENCE DESIGNS, AND REGARDLESS OF WHETHER TIHAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.TI’s standard terms of sale for semiconductor products (http://www.ti.com/sc/docs/stdterms.htm) apply to the sale of packaged integratedcircuit products. Additional terms may apply to the use or sale of other types of TI products and services.Designer will fully indemnify TI and its representatives against any damages, costs, losses, and/or liabilities arising out of Designer’s non-compliance with the terms and provisions of this Notice.IMPORTANT NOTICE

Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265Copyright © 2016, Texas Instruments Incorporated

http://www.ti.com/sc/docs/stdterms.htm

ethernet copper-to-fiber media converter reference design for

Documents