DM9331 - Davicom Semiconductor, Inc.

DM9331

100 Mbps Twisted Pair/Fiber Ethernet Media Converter Chip

Preliminary 1

Version: DM9331-DS-P02

September 21, 2001

General Description

The DM9331 is a physical-layer, single-chip, low

power transceiver for media converter application. On

the media side, it provides a direct interface either to

Unshielded Twisted Pair Category 5 Cable (UTP5) for

100BASE-TX Fast Ethernet, and it also provides

PECL interface to connect the external fiber optical

transceiver. Through the Media Converter Interface

(MCI), the DM9331 connects to another DM9331 for

the twisted pair to the fiber media converter, or fiber to

fiber repeater.

The DM9331 uses a low-power and high-performance

CMOS process. It contains the entire physical layer

functions of 100BASE-TX as defined by IEEE802.3u,

including the Physical Coding Sublayer (PCS),

Physical Medium Attachment (PMA), Twisted Pair

Physical Medium Dependent Sublayer (TP-PMD) and

a PECL compliant interface for a fiber optical module,

compliant with ANSI X3.166. The DM9331 provides a

strong support for the auto-negotiation function

utilizing automatic selection of full- or half-duplex

mode. Furthermore, due to the built-in wave-shaping

filter, the DM9331 needs no external filter to transport

signals to the media on the 100base-TX Ethernet

operation.

Block Diagram

MII

Management

Control

Biasing/

Power

Block

Clock

Circuit

Block

100Base-TX

Transceiver

100Base-FX

PECL

Interface

LED Driver

Media

Converter

Interface

MII

100Base-

PCS

Auto-Negotiation

TX/RX Module

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

2Preliminary

Version: DM9331-DS-P02

September 21, 2001

Table of Contents

General Description ..................................................1

Block Diagram ..........................................................1

Features....................................................................4

Pin Configuration: DM9331 LQFP ............................5

Pin Description..........................................................6

Media Converter Interface, 19 pins .......................6

Media Interface, 5 pins ..........................................7

LED Interface, 3 pins .............................................7

Mode, 1 pin ............................................................8

Bias and Clock, 3 pins ...........................................8

Power, 15 pins.......................................................8

Table A ..................................................................8

LED Configuration.....................................................9

Functional Description ............................................10

MCI interface .......................................................10

100Base-TX Operation........................................11

100Base-TX Transmit .........................................11

100Base-TX Operation........................................12

4B5B Encoder......................................................12

Scrambler ............................................................12

Parallel to Serial Converter..................................12

NRZ to NRZI Encoder .........................................12

NRZI to MLT-3.....................................................12

MLT-3 Driver........................................................12

4B5B Code Group ...............................................13

100Base-TX Receiver .........................................14

Signal Detect .......................................................14

Adaptive Equalizer...............................................14

MLT-3 to NRZI Decoder ......................................14

Clock Recovery Module.......................................14

NRZI to NRZ........................................................14

Serial to Parallel...................................................14

Descrambler ........................................................14

Code Group Alignment ........................................14

4B5B Decoder .....................................................15

Auto-Negotiation ..................................................15

MII Serial Management .......................................16

Serial Management Interface ..............................16

Management Interface – Read Frame Structure.16

Management Interface – Write Frame Structure 16

 Power Reduced Mode.........................................17

 Power Down Mode..............................................17

 Reduced Transmit Power Mode..........................17

 Link Fault Propagation ........................................17

MII Register Description ......................................... 18

- Key to Default ....................................................... 18

Basic Mode Control Register (BMCR) - 00............. 19

Basic Mode Status Register (BMSR) - 01 .............. 20

Auto-negotiation Advertisement Register (ANAR)

- 04.......................................................................... 21

Auto-negotiation Link Partner Ability Register

(ANLPAR) - 05........................................................ 21

Auto-negotiation Expansion Register (ANER)

- 06.......................................................................... 22

DAVICOM Specified Configuration Register (DSCR)

- 16.......................................................................... 23

DAVICOM Specified Configuration and Status

DAVICOM Specified Interrupt Register - 21 ........... 25

Absolute Maximum Ratings.................................... 26

Operating Conditions........................................... 26

Comments ........................................................... 26

DC Electrical Characteristics .................................. 27

AC Electrical Characteristics & Timing Waveforms

................................................................................ 28

TP Interface......................................................... 28

Oscillator Timing .................................................. 28

MDC/MDIO Timing.............................................. 28

MDIO Timing when OUTPUT by STA................. 29

MDIO Timing when OUTPUT by DM9331........... 29

Auto-negotiation and Fast Link Pulse Timing

Parameters.......................................................... 29

Auto-negotiation and Fast Link Pulse Timing

Diagram............................................................... 29

 TXD to TP or FX Transmit Latency Timing Diagram

............................................................................ 30

 TXD to TP or FX Transmit Latency Parameters. 30

 TP or FX to RXD Receive Latency Timing Diagram

............................................................................ 30

 TP or FX to RXD Receive Latency Parameters.. 30

Application Notes.................................................... 31

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

Preliminary 3

Version: DM9331-DS-P02

September 21, 2001

Network Interface Signal Routing ........................31

1. 100Base-TX Side Application..........................31

2. 100Base-TX Side (Power Reduction Application)

.............................................................................32

3. 100Base-FX Side Application..........................33

4. Power Decoupling Capacitors .........................34

5. Ground Plane Layout.......................................35

6. Power Plane Partitioning .................................36

7. Media Converter Interface ...............................37

8. Link Fault Propagation Application ..................38

9. Media Converter or Repeater Application .......39

10. Link Fault Propagation LED Display................40

Magnetics Selection Guide .....................................41

Package Information...............................................42

Ordering Information...............................................43

Disclaimer ...............................................................43

Company Overview.................................................43

Products..................................................................43

Contact Windows....................................................43

Warning ..................................................................43

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

4Preliminary

Version: DM9331-DS-P02

September 21, 2001

Features

 100Base-TX to 100Base-FX media converter

application chip set.

 100Base-FX to 100Base-FX repeater application

chip set under full duplex mode.

 100Base-TX to 100Base-TX repeater application

chip set under full duplex mode.

 Optional Fault propagation on no link condition.

 Fully compliant with IEEE 802.3u 100Base-TX/FX

 Compliant with ANSI X3T12 TP-PMD 1995

standard

 Supports Auto-Negotiation function to 100 Mbps

full/half duplex, compliant with IEEE 802.3u.

 Remote fault detection capability

 Far end fault signaling option in FX mode

 Selectable twisted-pair or fiber mode output

 Selectable full-duplex or half-duplex operation

 Provides Loopback mode for easy system

diagnostics

 LED status outputs indicate Link/Activity, Full/Half-

duplex and Fault LED.

 Single Low-Power Supply of 3.3V with 0.35µm CMOS

technology

 Very Low Power consumption modes:

● Power Reduced mode (cable detection)

● Power Down mode

● Selectable TX drivers for 1:1 or 1.25:1 transformers

for additional power reduction.

 Compatible with 3.3V and 5.0V tolerant I/Os

 48-pin LQFP small package (1x1 cm)

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

Preliminary 5

Version: DM9331-DS-P02

September 21, 2001

Pin Configuration

AVDD

RX+/FXRD+

TX-/FXTD-

RX-/FXRD-

AGND

TX+/FXTD+

AVDD

PWRDWN

FULL/HALFLED#/OP0

LINKLED#/OP1

RXDV

DVDD

RESET#

OSCIN

DGND

AGND

BGRESG

BGRES 13

TXD[1]

LINK/ACTLED#/OP2

TPFAULT

DGND

DVDD

LNKFAULT#

LNKFAULTEN

TXEN

TXCLK

DVDD

TXD[0]

MDC

25 MDIO

RXD[0]

TPSET0

FXFAULT/TPSET1

RXD[1]

DVDD

MDINTR#

FAULTLED#

DGND

CHIPEN

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

6Preliminary

Version: DM9331-DS-P02

September 21, 2001

Pin Description

I : Input, O : Output, LI : Latch input when power-up/reset, Z : Tri-State output, U : Pull-up

D : Pull-down

Media converter interface, 18 pins

Pin No. Pin Name I/O Description

14 TPFAULT O Twisted Pair Fault

0 = Twisted pair link fault.

1 = Twisted pair normal work.

17 LNKFAULT# I Link Fault Propagation

0 = Link fault propagation is active.

1 = normal operation.

18 LNKFAULTEN I Link Fault Propagation Enable

0 = Link fault propagation disable.

1 = Link fault propagation enable

20,19 TXD[0:1] I Transmit Data

2-bit data inputs (synchronous to the 50MHz OSCIN).

21 TXEN I Transmit Enable

Active high indicates the presence of valid data on the TXD[0:1] for

100Mbps mode

22 TXCLK O Transmit Clock

25MHz transmit clock.

24 MDC I Management Data Clock

Synchronous clock for the MDIO management data. This clock is

provided by management entity, and it is up to 2.5MHz

25 MDIO I/O Management Data I/O

Bi-directional management data that may be provided by the station

management entity or the PHY.

26 FXFAULT/

TPSET1

O,Z

,LI

(D)

Fiber Fault

0 = Fiber link fault; Fiber receive far end fault package or fiber

disconnect.

1 = Fiber normal work.

TPSET1 (reset latch input)

0 = Fiber mode; default pull low.

1 = Twisted pair mode; need 4.7kΩ resistor to pull high.

27 TPSET0 Z,LI

(D)

Twisted Pair set (reset latch input)

0 = Fiber mode; default pull low.

1 = Twisted pair mode; need 4.7kΩ resistor to pull high.

29,28 RXD[0:1]

O,Z

,LI

(D)

Receive Data Output

2-bit data outputs (synchronous to the 50MHz OSCIN )

32 MDINTR# O, Z Status Interrupt Output:

Asserted low whenever there is a status change (link, speed, duplex).

The MDINTR# pin has a high impedance output, a 2.2KΩ pull-high

resistor is needed.

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

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Version: DM9331-DS-P02

September 21, 2001

34 FAULTLED# O,Z Link Fault LED

Active Low.

In TP mode, Indicates TP Fault LED.

In FX mode, Indicates FX Fault LED.

36 CHIPEN Z,LI

(D)

Chip Set Enable

Need a 4.7kΩ resistor pull high for enabling a chip set.

37 RXDV O,Z Receive Data Valid

Asserted high to indicate that the valid data is present on the RXD[0:1].

40 RESET# I Reset

Active low input initializes the DM9331.

Media interface, 5 pins

Pin No. Pin Name I/O Description

3,4 RX+/FXRD+

RX-/FXRD-

I Differential receive pair/PECL receive pair

Differential data is received from the media.

Differential Pseudo ECL signal is received from the media in fiber mode.

7,8 TX+/FXTD+

TX-/FXTD-

O Differential transmit pair/PECL transmit pair

Differential data is transmitted to the media in TP mode.

Differential Pseudo ECL signal transmits to the media in fiber mode.

45 SD I Fiber-optic signal detect

PECL signal which indicates whether or not the fiber-optic receive pair is

receiving valid signal levels.

LED interface, 3 pins

Pin No. Pin Name I/O Description

11 FULL

/HALF LED#

/OP0

,LI

(U)

Full-Duplex/ Half-Duplex LED

Active states indicate Full-duplex mode. Active states see LED

configuration.

OP0 : (power up reset latch input)

This pin is used to control the forced or advertised operating mode of the

DM9331 according to the Table A. The value is latched into the DM9331

registers at power-up/reset.

12 LINK LED#

/OP1

,LI

(U)

Link LED

Active states indicate good link. Active states see LED configuration.

OP1 : (power up reset latch input)

This pin is used to control the forced or advertised operating mode of the

DM9331 according to the Table A. The value is latched into the DM9331

registers at power-up/reset.

13 LINK/ACT LED#

/OP2

,LI

(U)

Link LED & Activity LED :

Active states indicate good link. It is also an activity LED function when

transmitting or receiving data. Active states see LED configuration.

OP2 : (power up reset latch input)

This pin is used to control the forced or advertised operating mode of the

DM9331 according to the Table A. The value is latched into the DM9331

registers at power-up/reset.

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

8Preliminary

Version: DM9331-DS-P02

September 21, 2001

Mode, 1 pin

Pin No. Pin Name I/O Description

10 PWRDWN I Power down control

Asserted high to force DM9331 into power down mode. When in power

down mode, most of the DM9331 circuit block’s power is turned off, only

the MII management interface (MDC, MDIO) logic is available. To leave

power down mode, DM9331 need the hardware or software reset with

the PWRDWN pin low.

Bias and clock, 3 pins

Pin No. Pin Name I/O Description

47 BGRESG P Bandgap Ground

48 BGRES I/O Bandgap Voltage Reference Resistor 6.8K ohm

43 OSCIN I 3.3V 50MHz clock input.must be using 3.3v output oscillators.

Power, 15 pins

Pin No. Pin Name I/O Description

1,2,9 AVDD P Analog Power

5,6,46 AGND P Analog Ground

16,23,30,31,

39,41

DVDD P Digital Power

15,33,44 DGND P Digital Ground

Table A

OP2 OP1 OP0 Function

00 0 Auto negotiation enables 100TX Full/Half

capabilities

00 1 Manually select 100FX HDX

0 1 0 Manually select 100FX FDX

1 0 1 Manually select 100TX HDX

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

Preliminary 9

Version: DM9331-DS-P02

September 21, 2001

LED Configuration

LEDs flash once for about 200ms after power-on reset

or software reset by writing PHY register. All LED

pins are dual function pins, which can be configured

as either active high or low by pulling them low or high

accordingly. If the pin is pulled high, the LED is active

low after reset. Likewise, if the pin is pulled low, the

LED is active high.

VCC

10K Ohm

DM9331

300 OhmPull Low for

Reset

10K Ohm

300 Ohm

Pull High for

Reset

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

10 Preliminary

Version: DM9331-DS-P02

September 21, 2001

Functional Description

The DM9331 Fast Ethernet single-chip transceiver,

providing the functionality as specified in IEEE 802.3u,

integrates a complete 100Base-TX module and a complete

100Base-FX module. The DM9331 provides a Media

Converter Interface (MCI) as connection interface.

The DM9331 performs all PCS (Physical Coding Sublayer),

PMA (Physical Media Access), TP-PMD (Twisted Pair

Physical Medium Dependent) sublayer and a PECL

compliant interface for a fiber optic module. Figure 1

shows the major functional blocks implemented in the

DM9331.

Media

Converter

Interface

(MCI)

100Base-TX/FX

Transmitter

100Base-TX/FX

Receiver

Auto

Negotiation

MII Serial

Management

Interface

Figure 1

MCI Interface

The DM 9331 provides a Media Converter Interface (MCI) .

The purpose of the MCI interface is to provide a simple, easy

to implement connection to another DM9331.

The MCI consists of a 2 bits receive data bus, a two bits

transmit data bus, and control signals to facilitate data

transfers between the two DM9331 chips.

• TXD (transmit data) is a two bits of data that are driven

by the reconciliation sublayer synchronously with

respect to OSCIN clock For each OSCIN clock period

which TXEN is asserted, TXD (1:0) are accepted for

transmission by the PHY.

• TXEN (transmit enable) input from another DM9331

RXDV signal reconciliation sublayer indicates that data

are being presented on the MCI for transmission on the

physical medium.

• RXD (receive data) is a two bits of data that are

sampled by the reconciliation sublayer synchronously

with respect to OSCIN clock. For each OSCIN clock

period which RXDV is asserted, RXD (1:0) are

transferred from the PHY to another DM9331.

• RXDV (receive data valid) output to another DM9331

TXEN signal indicates that the DM9331 is data ready.

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

Preliminary 11

Version: DM9331-DS-P02

September 21, 2001

100Base-TX Operation

The 100Base-TX transmitter receives 2-bits data clocked in

at 50MHz from the MCI, and outputs a scrambled 5-bit

encoded MLT-3 signal to the media at 100Mbps. The on-

chip clock circuit converts the 25MHz clock into a 125MHz

clock for internal use.

These two busses include various controls and signal

indications that facilitate data transfers between the DM9331

chip set.

100Base-TX Transmit

The 100Base-TX transmitter consists of the functional

blocks shown in figure 2. The 100Base-TX transmit section

converts 2-bits synchronous data provided by the MCI to a

scrambled MLT-3 125 million symbols per second serial

data stream.

MCI

Signals

MCI

Interface/

Control

4B/5B

Encoder

4B/5B

Decoder

Code-

group

Alignment

Descrambler Serial to

Parallel

NRZI

NRZ

CRM

MLT-3 to

NRZI

Adaptive

Digital

Logic

Scrambler Parallel

to Serial

NRZ

NRZI

NRZI to

MLT-3

Driver

Rise/Fall

Time

CTL

TX CGM LED

Driver

Auto-Negotiation

TX/RX Module

125M CLK

25M CLK

LED1-3#50M OSCI

TX±

RX±

TX±

RX±

Figure 2

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

12 Preliminary

Version: DM9331-DS-P02

September 21, 2001

100Base-TX Operation

The block diagram in figure 2 provides an overview of the

functional blocks contained in the transmit section.

The transmitter section contains the following functional

blocks:

- 4B5B Encoder

- Scrambler

- Parallel to Serial Converter

- NRZ to NRZI Encoder

- NRZI to MLT-3

- MLT-3 Driver

4B5B Encoder

The 4B5B encoder converts 4-bit (4B) nibble data generated

by the MAC Reconciliation Layer into a 5-bit (5B) code group

for transmission, reference Table 1. This conversion is

required for control and packet data to be combined in code

groups. The 4B5B encoder substitutes the first 8 bits of the

MAC preamble with a J/K code-group pair (11000 10001)

upon transmit. The 4B5B encoder continues to replace

subsequent 4B preamble and data nibbles with

corresponding 5B code-groups. At the end of the transmit

packet, upon the deassertion of the Transmit Enable signal

from the MAC Reconciliation layer, the 4B5B encoder injects

the T/R code-group pair (01101 00111) indicating end of

frame. After the T/R code-group pair, the 4B5B encoder

continuously injects IDLEs into the transmit data stream until

Transmit Enable is asserted and the next transmit packet is

detected.

The DM9331 includes a Bypass 4B5B conversion option

within the 100Base-TX Transmitter for support of

applications like 100 Mbps repeaters which do not require

4B5B conversion.

Scrambler

The scrambler is required to control the radiated emissions

(EMI) by spreading the transmit energy across the frequency

spectrum at the media connector and on the twisted pair

cable in 100Base-TX operation.

By scrambling the data, the total energy presented to the

cable is randomly distributed over a wide frequency range.

Without the scrambler, energy levels on the cable could

peak beyond FCC limitations at frequencies related to

repeated 5B sequences like continuous transmission of

IDLE symbols. The scrambler output is combined with the

NRZ 5B data from the code-group encoder via an XOR logic

function. The result is a scrambled data stream with

sufficient randomization to decrease radiated emissions at

critical frequencies.

Parallel to Serial Converter

The Parallel to Serial Converter receives parallel 5B

scrambled data from the scrambler and serializes it

(converts it from a parallel to a serial data stream).

The serialized data stream is then presented to the

NRZ to NRZI Encoder block

NRZ to NRZI Encoder

After the transmit data stream has been scrambled and

serialized, the data must be NRZI encoded for compatibility

with the TP-PMD standard for 100Base-TX transmission

over Category-5 unshielded twisted pair cable.

NRZI to MLT-3

The MLT-3 conversion is accomplished by converting the

data stream output from the NRZI encoder into two binary

data streams with alternately phased logic one events.

MLT-3 Driver

The two binary data streams created at the MLT-3 converter

are fed to the twisted pair output driver which converts these

streams to current sources and alternately drives either side

of the transmit transformer primary winding resulting in a

minimal current MLT-3 signal.

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

Preliminary 13

Version: DM9331-DS-P02

September 21, 2001

4B5B Code Gr oup

Symbol Meaning 4B code

3210 5B code

43210

0 Data 0 0000 11110

1 Data 1 0001 01001

2 Data 2 0010 10100

3 Data 3 0011 10101

4 Data 4 0100 01010

5 Data 5 0101 01011

6 Data 6 0110 01110

7 Data 7 0111 01111

8 Data 8 1000 10010

9 Data 9 1001 10011

A Data A 1010 10110

B Data B 1011 10111

C Data C 1100 11010

D Data D 1101 11011

E Data E 1110 11100

F Data F 1111 11101

I Idle undefined 11111

J SFD (1) 0101 11000

K SFD (2) 0101 10001

T ESD (1) undefined 01101

R ESD (2) undefined 00111

H Error undefined 00100

V Invalid undefined 00000

V Invalid undefined 00001

V Invalid undefined 00010

V Invalid undefined 00011

V Invalid undefined 00101

V Invalid undefined 00110

V Invalid undefined 01000

V Invalid undefined 01100

V Invalid undefined 10000

V Invalid undefined 11001

Tab le 1

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

14 Preliminary

Version: DM9331-DS-P02

September 21, 2001

100Base-TX Receiver

The 100Base-TX receiver contains several function blocks

that convert the scrambled 125Mb/s serial data to

synchronous 2-bit nibble data that is then provided to the

MCI.

The receive section contains the following functional blocks:

- Signal Detect

- Digital Adaptive Equalizer

- MLT-3 to NRZI Decoder

- Clock Recovery Module

- NRZI to NRZ Decoder

- Serial to Parallel

- Descrambler

- Code Group Alignment

- 4B5B Decoder

Signal Detect

The signal detect function meets the specifications

mandated by the ANSI XT12 TP-PMD 100Base-TX

Standards for both voltage thresholds and timing

parameters.

A daptive Equalizer

When transmitting data at high speeds over copper twisted

pair cable, attenuation based on frequency becomes a

concern. In high speed twisted pair signaling, the frequency

content of the transmitted signal can vary greatly during

normal operation based on the randomness of the

scrambled data stream. This variation in signal attenuation

caused by frequency variations must be compensated for to

ensure the integrity of the received data. In order to ensure

quality transmission when employing MLT-3 encoding, the

compensation must be able to adapt to various cable

lengths and cable types depending on the installed

environment. The selection of long cable lengths for a given

implementation, requires significant compensation which will

be over-kill in a situation that includes shorter, less

attenuating cable lengths. Conversely, the selection of short

or intermediate cable lengths requiring less compensation

will cause serious under-compensation for longer length

cables. Therefore, the compensation or equalization must

be adaptive to ensure proper conditioning of the received

signal independent of the cable length.

MLT-3 to NRZI Decoder

The DM9331 decodes the MLT-3 information from the

Digital Adaptive Equalizer into NRZI data.

Clock Recovery Module

The Clock Recovery Module accepts NRZI data from the

MLT-3 to NRZI decoder. The Clock Recovery Module locks

onto the data stream and extracts the 125MHz reference

clock. The extracted and synchronized clock and data are

presented to the NRZI to NRZ Decoder.

NRZI to NRZ

The transmit data stream is required to be NRZI encoded in

for compatibility with the TP-PMD standard for 100Base-TX

transmission over Category-5 unshielded twisted pair cable.

This conversion process must be reversed on the receive

end. The NRZI to NRZ decoder, receives the NRZI

data stream from the Clock Recovery Module and

converts it to a NRZ data stream to be presented to

the Serial to Parallel conversion block.

Serial to Parallel

The Serial to Parallel Converter receives a serial data

stream from the NRZI to NRZ converter, and converts

the data stream to parallel data to be presented to the

descrambler.

Descrambler

Because of the scrambling process required to control the

radiated emissions of transmit data streams, the receiver

must descramble the receive data streams. The

descrambler receives scrambled parallel data streams from

the Serial to Parallel converter, descrambles the data

streams, and presents the data streams to the Code Group

alignment block.

Code Group Alignment

The Code Group Alignment block receives un-aligned

5B data from the descrambler and converts it into 5B

code group data. Code Group Alignment occurs after

the J/K is detected, and subsequent data is aligned on

a fixed boundary.

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

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Version: DM9331-DS-P02

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4B5B Decoder

The 4B5B Decoder functions as a look-up table that

translates incoming 5B code groups into 4B (Nibble) data.

When receiving a frame, the first 2 5-bit code groups

received are the start-of-frame delimiter (J/K symbols). The

J/K symbol pair is stripped and two nibbles of preamble

pattern are substituted. The last two code groups are the

end-of-frame delimiter (T/R symbols).

The T/R symbol pair is also stripped from the nibble

presented to the Reconciliation layer.

Auto-Negotiation

The objective of Auto-negotiation is to provide a means to

exchange information between segment linked devices and

to automatically configure both devices to take maximum

advantage of their abilities. It is important to note that Auto-

negotiation does not test the link segment characteristics.

The Auto-Negotiation function provides a means for a device

to advertise supported modes of operation to a remote link

partner, acknowledge the receipt and understanding of

common modes of operation, and to reject un-shared

modes of operation. This allows devices on both ends of a

segment to establish a link at the best common mode of

operation. If more than one common mode exists between

the two devices, a mechanism is provided to allow the

devices to resolve to a single mode of operation using a

predetermined priority resolution function.

Auto-negotiation also provides a parallel detection function

for devices that do not support the Auto-negotiation feature.

During Parallel detection there is no exchange of

configuration information, instead, the receive signal is

examined. If it is discovered that the signal matches a

technology that the receiving device supports, a connection

will be automatically established using that technology. This

allows devices that do not support Auto-negotiation but

support a common mode of operation to establish a link.

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

16 Preliminary

Version: DM9331-DS-P02

September 21, 2001

MII Serial Management

The MII serial management interface consists of a

data interface, basic register set, and a serial

management interface to the register set. Through this

interface it is possible to control and configure multiple

PHY devices, get status and error information, and

determine the type and capabilities of the attached

PHY device(s).

The DM9331 management functions correspond to

MII specification for IEEE 802.3u-1995 (Clause 22) for

registers 0 through 6 with vendor-specific registers

16,17, and 18.

In read/write operation, the management data frame is

64-bits long and starts with 32 contiguous logic one

bits (preamble) synchronization clock cycles on MDC.

The Start of Frame Delimiter (SFD) is indicated by a

<01> pattern followed by the operation code

(OP):<10> indicates Read operation and <01>

indicates Write operation. For read operation, a 2-bit

turnaround (TA) filing between Register Address field

and Data field is provided for MDIO to avoid contention.

Following the turnaround time, 16-bit data is read from

or written onto management registers.

Serial Management Interface

The serial control interface uses a simple two-wired

serial interface to obtain and control the status of the

physical layer through the MII interface. The serial

control interface consists of MDC (Management Data

Clock), and MDI/O (Management Data Input/Output)

signals.

The MDIO pin is bi-directional and may be shared by

up to 32 devices.

Management Interface - Read Frame Structure

32 "1"s 0 1 1 0 A4 A3 A0 R4 R3 R0 Z0

Idle Preamble SFD Op Code PHY Address Register Address Turn Around Data Idle

Read

Write

MDC

MDIO Read

D15 D14 D1 D0

// //

Management Interface - Write Frame Structure

32 "1"s 0 1 10 A4 A3 A0 R4 R3 R0 1 0 D15 D14 D1 D0

Idle Preamble SFD Op Code PHY Address Register Address Turn Around Data Idle

Write

MDC

MDIO Write

Figure 5

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

Preliminary 17

Version: DM9331-DS-P02

September 21, 2001

Power Reduced Mode

The Signal detect circuit is always turned on to monitor

whether there is any signal on the media. In case of cable

disconnection, DM9331 will automatically turn off the power

and enter the Power Reduced mode, regardless of its

operation mode being N-way auto-negotiation or forced

mode. While in the Power Reduced mode, the transmit

circuit will continue sending out fast link pules with minimum

power consumption. If a valid signal is detected from the

media, which might be N-way fast link pules, 10Base-T

normal link pules, or 100Base-TX MLT3 signals, the device

wakes up and resumes normal operation mode.

Automatic reduced power down mode can be disabled by

writing Zero to Reg.16.4.

Po wer Down Mode

Power Down mode is entered by setting Reg.0.11 to ONE or

pulling PWRDWN pin high, which disables all transmit,

receive functions and MCI interface functions except the

MDC/MDIO management interface.

Reduced Transmit Power Mode

Additional Transmit power reduction can be gained by

designing with 1.25:1 turns ration magnetics on its TX side

and using a 8.5KΩ resistor on BGRES and BGRESG pins,

and the TX+/TX- pull-high resistors being changed from 50

Ω to 78Ω. This configuration could reduce about 20% of

transmit power.

Link Fault Propagation

The DM9331 will propagate link fault signals from

media to another DM9331. If link fault happens, the

DM9331 will send out fault signals to another DM9331.

In FX mode, their are two types of link failure, receive

link failure or remote fault (receive far end fault).In the

event of a fiber receive link failure, the DM9331 will

send out an FX fault signal. The DM9331 will send out

a far end fault signal to the fiber optic media, if the

DM9331 receive the fault signal from the other device.

In TP mode, In the event of a TP receive link failure,

the DM9331 will send out a TP fault signal. The

DM9331 will stop to transmit idle signal to the CAT5

media, if the DM9331 receive the fault signal from the

other device.

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

18 Preliminary

Version: DM9331-DS-P02

September 21, 2001

MII Register Description

ADDName1514131211109 8 7 6 5 4 3 2 1 0

00 CONTROL Reset Loop

back Speed

select Auto-N

Enable Power

Down Isolate Restart

Auto-N Full

Duplex Coll.

Test Reserved

01 STATUS T4

Cap. TX FDX

Cap. TX HDX

Cap. Reserved Pream.

Supr. Auto-N

Compl. Remote

Fault Auto-N

Cap. Link

Status Rsvd Extd

Cap.

04 Auto-Neg.

Advertise Next

Page FLP Rcv

Ack Remote

Fault Reserved FC

Adv T4

Adv TX FDX

Adv TX HDX

Adv Rsvd Rsvd A dvertised Protocol Selector Field

05 Link Part.

Ability LP Next

Page LP

Ack LP

RF Reserved LP

FC LP

T4 LP

TX FDX LP

TX HDX LP

10 FDX LP

10 HDX Link Partner Protocol Selector Field

06 Auto-Neg.

Expansion Reserved Pardet

Fault LP Next

Pg A ble Next Pg

Able New Pg

Rcv LP A utoN

Cap.

16 Aux.

Config. BP

4B5B BP

SCR BP

ALIGN BP_A

DPOK Rsvd TX/FX

Select FEF

Enable RMCI

Enable Force

100LNK SPDLE

D_CTL Rsvd RPDCT

R-EN Reset

St. Mch Pream.

Supr. Sleep

mode Remote

LoopOut

17 Aux.

Conf/Stat 100

FDX 100

HDX Reserved Reserved A uto-N. Monitor Bit [3:0]

21 MDINTR INTR

PEND Reserved FDX

Mask Rsvd Link

Mask INTR

Mask Reserved FDX

Change Rsvd Link

Change Rsvd INTR

Status

Key to Default

In the register description that follows, the default

column takes the form:

Where：

<Reset Value>:

1 Bit set to logic one

0 Bit set to logic zero

X No default value

(PIN#) Value latched in from pin # at reset

<Access Type>:

RO = Read only

RW = Read/Write

<Attribute (s)>:

SC = Self clearing

P = Value permanently set

LL = Latching low

LH = Latching high

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

Preliminary 19

Version: DM9331-DS-P02

September 21, 2001

Basic Mode Control Register (BMCR) - 00

Bit Bit Name Default Description

0.15 Reset 0, RW/SC Reset:

1=Software reset

0=Normal operation

This bit sets the status and controls the PHY registers to their default

states. This bit, which is self-clearing, will keep returning a value of

one until the reset process is completed

0.14 Loopback 0, RW Loopback:

Loop-back control register

1 = Loop-back enabled

0 = Normal operation

When in 100Mbps operation mode, setting this bit may cause the

descrambler to lose synchronization and produce a 720ms "dead

time" before any valid data appears at the MCI receive outputs

0.13 Speed selection 1, RW Speed select:

1 = 100Mbps

0 = invalid

0.12 Auto-negotiation

enable

1, RW Auto-negotiation enable:

1 = Auto-negotiation is enabled, bit 8 and 13 will be in auto-

negotiation status.

0.11 Power down 0, RW Power Down:

While in the power-down state, the PHY should respond to

management transactions. During the transition to power-down state

and while in the power-down state, the PHY should not generate

spurious signals on the MCI.

1=Power down

0=Normal operation

0.10 Isolate 0,RW Isolate:

1 = Isolates the DM9331 from the MCI with the exception of the

serial management. (When this bit is asserted, the DM9331 does

not respond to the TXD[0:1] and TXEN inputs, and it shall present a

high impedance on its TXCLK, RXDV, and RXD[0:1] outputs. When

the PHY is isolated from the MCI, it shall respond to the

management transactions)

0 = Normal operation

0.9 Restart auto-

negotiation

0,RW/SC Restart auto-negotiation:

1 = Restart auto-negotiation. Re-initiates the auto-negotiation

process. When auto-negotiation is disabled (bit 12 of this register

cleared), this bit has no function and it should be cleared. This bit is

self-clearing and it will keep returning a value of 1 until auto-

negotiation is initiated by the DM9331. The operation of the auto-

negotiation process will not be affected by the management entity

that clears this bit

0 = Normal operation

0.8 Duplex mode 1,RW Duplex mode:

1 = Full duplex operation. Duplex selection is allowed when Auto-

negotiation is disabled (bit 12 of this register is cleared). With auto-

negotiation enabled, this bit reflects the duplex capability selected by

auto-negotiation

0 = Normal operation

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

20 Preliminary

Version: DM9331-DS-P02

September 21, 2001

0.7 Collision test 0,RW Collision test:

1 = Collision test enabled. When set, this bit will cause the COL

signal to be asserted in response to the assertion of TXEN

0 = Normal operation

0.6-0.0 Reserved 0,RO Reserved:

Write as 0, ignore on read

Basic Mode Status Register (BMSR) - 01

Bit Bit Name Default Description

1.15 100BASE-T4 0,RO/P 100BASE-T4 capable:

1 = DM9331 is able to perform in 100BASE-T4 mode

0 = DM9331 is not able to perform in 100BASE-T4 mode

1.14 100BASE-TX

full duplex

1,RO/P 100BASE-TX full duplex capable:

1 = DM9331 is able to perform 100BASE-TX in full duplex mode

0 = DM9331 is not able to perform 100BASE-TX in full duplex mode

1.13 100BASE-TX

half duplex

1,RO/P 100BASE-TX half duplex capable:

1 = DM9331 is able to perform 100BASE-TX in half duplex mode

0 = DM9331 is not able to perform 100BASE-TX in half duplex mode

1.12 Reserved 0,RO/P Reserved

1.11 Reserved 0,RO/P Reserved

1.10-1.7 Reserved 0,RO Reserved:

Write as 0, ignore on read

1.6 MF preamble

suppression

0,RO MII frame preamble suppression:

1 = PHY will accept management frames with preamble suppressed

0 = PHY will not accept management frames with preamble

suppressed

1.5 Auto-

negotiation

Complete

0,RO Auto-negotiation complete:

1 = Auto-negotiation process completed

0 = Auto-negotiation process not completed

1.4 Remote fault 0,

RO/LH Remote fault:

1 = Remote fault condition detected (cleared on read or by a chip

reset). Fault criteria and detection method is DM9331

implementation specific. This bit will set after the RF bit in the

ANLPAR (bit 13, register address 05) is set

0 = No remote fault condition detected

1.3 Auto-

negotiation

ability

1,RO/P Auto configuration ability:

1 = DM9331 is able to perform auto-negotiation

0 = DM9331 is not able to perform auto-negotiation

1.2 Link status 0,RO/LL Link status:

1 = Valid link is established (for 100Mbps operation)

0 = Link is not established

The link status bit is implemented with a latching function, so that the

occurrence of a link failure condition causes the link status bit to be

cleared and remain cleared until it is read via the management

interface

1.1 Reserved 0,RO/LH Reserved

1.0 Extended

capability

1,RO/P Extended capability:

1 = Extended register capable. 0 = Basic register capable only

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

Preliminary 21

Version: DM9331-DS-P02

September 21, 2001

Auto-negotiation Advertisement Register (ANAR) - 04

This register contains the advertised abilities of this DM9331 device as they will be transmitted to its link partner

during Auto-negotiation.

Bit Bit Name Default Description

4.15 NP 0,RO/P Next page indication:

0 = No next page available

1 = Next page available

The DM9331 has no next page, so this bit is permanently set to 0

4.14 ACK 0,RO Acknowledge:

1 = Link partner ability data reception acknowledged

0 = Not acknowledged

The DM9331's auto-negotiation state machine will automatically

control this bit in the outgoing FLP bursts and set it at the

appropriate time during the auto-negotiation process. Software

should not attempt to write to this bit.

4.13 RF 0, RW Remote fault:

1 = Local device senses a fault condition

0 = No fault detected

4.12-4.11 Reserved 0, RW Reserved:

Write as 0, ignore on read

4.10 FCS 0, RW Flow control suppor t:

1 = Controller chip supports flow control ability

0 = Controller chip doesn’t support flow control ability

4.9 T4 0, RO/P 100BASE-T4 support:

1 = 100BASE-T4 is supported by the local device

0 = 100BASE-T4 is not supported

The DM9331 does not support 100BASE-T4 so this bit is

permanently set to 0

4.8 TX_FDX 1, RW 100BASE-TX full duplex support:

1 = 100BASE-TX full duplex is supported by the local device

0 = 100BASE-TX full duplex is not supported

4.7 TX_HDX 1, RW 100BASE-TX support:

1 = 100BASE-TX is supported by the local device

0 = 100BASE-TX is not supported

4.6 Reserved 0, RW Reserved

4.5 Reserved 0, RW Reserved

4.4-4.0 Selector <00001>, RW Protocol selection bits:

These bits contain the binary encoded protocol selector supported

by this node.

<00001> indicates that this device supports IEEE 802.3 CSMA/CD.

Auto-negotiation Link Partner Ability Register (ANLPAR) – 05

This register contains the advertised abilities of the link partner when received during Auto-negotiation.

Bit Bit Name Default Description

5.15 NP 0, RO Next page indication:

0 = Link partner, no next page available

1 = Link partner, next page available

5.14 ACK 0, RO Acknowledge:

1 = Link partner ability data reception acknowledged

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

22 Preliminary

Version: DM9331-DS-P02

September 21, 2001

0 = Not acknowledged

The DM9331's auto-negotiation state machine will automatically

control this bit from the incoming FLP bursts. Software should not

attempt to write to this bit.

5.13 RF 0, RO Remote Fault:

1 = Remote fault indicated by link partner

0 = No remote fault indicated by link partner

5.12-5.11 Reserved X, RO Reserved:

Write as 0, ignore on read

5.10 FCS 0, RW Flow control suppor t:

1 = Controller chip supports flow control ability by link partner

0 = Controller chip doesn’t support flow control ability by link partner

5.9 T4 0, RO 100BASE-T4 support:

1 = 100BASE-T4 is supported by the link partner

0 = 100BASE-T4 is not supported by the link partner

5.8 TX_FDX 0, RO 100BASE-TX full duplex support:

1 = 100BASE-TX full duplex is supported by the link partner

0 = 100BASE-TX full duplex is not supported by the link partner

5.7 TX_HDX 0, RO 100BASE-TX support:

1 = 100BASE-TX half duplex is supported by the link partner

0 = 100BASE-TX half duplex is not supported by the link partner

5.6 10_FDX 0, RO 10BASE-T full duplex support:

1 = 10BASE-T full duplex is supported by the link partner

0 = 10BASE-T full duplex is not supported by the link partner

5.5 10_HDX 0, RO 10BASE-T support:

1 = 10BASE-T half duplex is supported by the link partner

0 = 10BASE-T half duplex is not supported by the link partner

5.4-5.0 Selector <00000>, RO Protocol selection bits:

Link partner’s binary encoded protocol selector

A uto-negotiation Expansion Regis ter (ANE R)- 06

6.15-6.5 Reserved X, RO Reserved:

Write as 0, ignore on read

6.4 PDF 0, RO/LH Local device parallel detection fault:

PDF = 1 : A fault detected via parallel detection function.

PDF = 0 : No fault detected via parallel detection function

6.3 LP_NP_ABLE 0, RO Link partner next page able:

LP_NP_ABLE = 1 : Link partner, next page available

LP_NP_ABLE = 0 : Link partner, no next page

6.2 NP_ABLE 0,RO/P Local device next page able:

NP_ABLE = 1 : DM9331, next page available

NP_ABLE = 0 : DM9331, no next page

DM9331 does not support this function, so this bit is always 0.

6.1 PAGE_RX 0, RO/LH New page received:

A new link code word page received. This bit will be automatically

cleared when the register (register 6) is read by management.

6.0 LP_AN_ABLE 0, RO Link partner auto-negotiation able:

A “1” in this bit indicates that the link partner supports Auto-

negotiation.

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

Preliminary 23

Version: DM9331-DS-P02

September 21, 2001

DAVICOM Specified Configuration Register (DSCR) - 16

Bit Bit Name Default Description

16.15 BP_4B5B 0, RW Bypass 4B5B encoding and 5B4B decoding :

1 = 4B5B encoder and 5B4B decoder function bypassed

0 = Normal 4B5B and 5B4B operation

16.14 BP_SCR 0, RW Bypass scrambler/descrambler function :

1 = Scrambler and descrambler function bypassed

0 = Normal scrambler and descrambler operation

16.13 BP_ALIGN 0, RW Bypass symbol alignment function:

1 = Receive functions (descrambler, symbol alignment and

symbol decoding functions) bypassed. Transmit functions

( symbol encoder and scrambler) bypassed

0 = Normal operation

16.12 BP_ADPOK 0, RW BYPASS ADPOK :

Force signal detector (SD) active. This register is for debug only,

not release to customer.

1=Force SD is OK,

0=Normal operation

16.11 Reserved 0,RW Reserved

16.10 TX 1, RW 100BASE-TX or FX mode control:

1 = 100BASE-TX operation

0 = 100BASE-FX operation

16.9 FEF 0, RW Far End Fault enable :

Control the Far End Fault mechanism associated with 100Base-FX

operation.

1 = Enable

0 = Disable

16.8 Reserved 1, RW Reserved:

Write as 1.

16.7 F_LINK_100 0, RW Force good link in 100Mbps:

0 = Normal 100Mbps operation

1 = Force 100Mbps good link status

This bit is useful for diagnostic purposes.

16.6 Reserved 0, RW Reserved:

Write as 0.

16.5 Reserved 0, RO Reserved:

Write as 0, ignore on read.

16.4 RPDCTR-EN 1, RW Reduced power down control enable:

This bit is used to enable automatic reduced power down.

0: Disable automatic reduced power down.

1: Enable automatic reduced power down.

16.3 SMRST 0, RW Reset state machine:

When writes 1 to this bit, all state machines of PHY will be reset.

This bit is self-clear after reset is completed.

16.2 MFPSC 0, RW MF preamble suppression control:

MCI frame preamble suppression control bit

1 = MF preamble suppression bit on

0 = MF preamble suppression bit off

16.1 SLEEP 0, RW Sleep mode:

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

24 Preliminary

Version: DM9331-DS-P02

September 21, 2001

Writing a 1 to this bit will cause PHY entering the Sleep mode and

power down all circuit except oscillator and clock generator circuit.

When waking up from Sleep mode (write this bit to 0), the

configuration will go back to the state before sleep; but the state

machine will be reset

16.0 RLOUT 0, RW Remote loopout control:

When this bit is set to 1, the received data will loop out to the

transmit channel. This is useful for bit error rate testing

DAVICOM Specified Configuration and Status Register (DSCSR) - 17

Bit Bit Name Default Description

17.15 100FDX 1, RO 100M full duplex operation mode:

After auto-negotiation is completed, results will be written to this bit.

If this bit is 1, it means the operation 1 mode is a 100M full duplex

mode. The software can read bit [15:12] to see which mode is

selected after auto-negotiation. This bit is invalid when it is not in the

auto-negotiation mode.

17.14 100HDX 1, RO 100M half duplex operation mode:

After auto-negotiation is completed, results will be written to this bit.

If this bit is 1, it means the operation 1 mode is a 100M half-duplex

mode. The software can read bit[15:12] to see which mode is

selected after auto-negotiation. This bit is invalid when it is not in the

auto-negotiation mode.

17.13 Reserved 0, RO Reserved

17.12 Reserved 0, RO Reserved

17.11-

17.9

Reserved 0, RO Reserved:

Read as 0, ignore on write

17.8-17.4 Reserved 0, RW Reserved.

17.3-17.0 ANMB[3:0] 0, RO Auto-negotiation monitor bits:

These bits are for debug only. The auto-negotiation status will be

written to these bits.

B3 b2 b1 b0

0 0 0 0 In IDLE state

0 0 0 1 Ability match

0 0 1 0 Acknowledge match

0 0 1 1 Acknowledge match fail

0 1 0 0 Consistency match

0 1 0 1 Consistency match fail

0 1 1 0 Parallel detects signal_link_ready

0 1 1 1 Parallel detects signal_link_ready fail

1 0 0 0 Auto-negotiation completed successfully

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

Preliminary 25

Version: DM9331-DS-P02

September 21, 2001

DAVICOM Specified Interrupt Register – 21

Bit Bit Name Default Description

21.15 INTR PEND 0, RO Interrupt pe nding :

Indicates that the interrupt is pending and is cleared by the current

read. This bit shows the same result as bit 0. (INTR Status)

21.14-

21.12

Reserved 0, RO Reserved

21.11 FDX mask 1, RW Full-duplex interrupt mask :

When this bit is set, the Duplex status change will not generate the

interrupt

21.10 Reserved 1, RW Reserved

21.9 LINK mask 1, RW Link interrupt mask :

When this bit is set, the link status change will not generate the

interrupt

21.8 INTR mask 1, RW Master interrupt mask :

When this bit is set, no interrupts will be generated under any

condition.

21.7-21.5 Reserved 0, RO Reserved

21.4 FDX change 0,RO/LH Duplex status change interrupt :

“1” indicates a change of duplex since last register read. A read of

this register will clear this bit.

21.3 Reserved 0, RO/LH Reserved

21.2 LINK change 0, RO/LH Link status change interrupt :

“1” indicates a change of link since last register read. A read of this

21.1 Reserved 0, RO Reserved

21.0 INTR status 0, RO/LH Interrupt status :

The status of MDINTR#. “1” indicates that the interrupt mask is off

that one or more of the change bits are set. A read of this register

will clear this bit.

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

26 Preliminary

Version: DM9331-DS-P02

September 21, 2001

Absolute Maximum Ratings

A bsolute Maximum Ratings ( 25°

°°

°C )

Symbol Parameter Min. Max. Unit Conditions

DVCC, AVCC Supply Voltage -0.3 3.6 V

VIN DC Input Voltage (VIN)-0.55.5V

VOUT DC Output Voltage(VOUT)-0.33.6V

Tstg Storage Temperature Rang (Tstg) -65 +125 °CEIAJ-4701B

Tc Case Temperature 0 85 °C

LTLead Temp. (TL, Soldering, 10 sec.) --- 235 °CJEDEC J-STD-020A

Operating Conditions

Symbol Parameter Min. Max. Unit Conditions

DVCC,AVCC Supply Voltage 3.135 3.465 V

TAOperating Ambient Temperature ０70 °C

Tc Case Temperature 0 85 °CAs T

A = 70°C

100BASE-TX --- 88 mA3.3V

100BASE-FX --- 25 mA3.3V

Auto-negotiation --- 45 mA3.3V

Power Reduced Mode (without cable ) --- 18 mA3.3V

(Power Dissipation)

Power Down Mode --- 3 mA3.3V

Comments

Stresses above those listed under “Absolute

Maximum Ratings” may cause permanent damage to

the device. These are stress ratings only.

Functional operation of this device at these or any

other conditions above those indicated in the

operational sections of this specification is not implied.

Exposure to absolute maximum rating conditions for

extended periods may affect device reliability.

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

Preliminary 27

Version: DM9331-DS-P02

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DC Electrical C haracteristics (VCC = 3.3V, TA = 0 ~ 70°C)

Symbol Parameter Min. Typ. Max. Unit Conditions

TTL Inputs

(TXD0, TXD1, TXEN, LNKFAULTPROG, LNKFAULTEN, MDC, MDIO,CHIPEN, OPMODE0-2, TPSET0, TPSET1,

DISFEF,SCRAMEN, RESET# )

VIL Input Low Voltage --- --- 0.8 V

VIH Input High Voltage 2.0 --- --- V

IIL Input Low Leakage Current --- --- 10 uAVIN = 0.4V

IIH Input High Leakage Current --- --- -10 uAVIN = 2.7V

MCI TTL Outp uts

( RXD0, RXD1, RXDV, RXER,TPFAULT, FXFAULT MDIO)

VOL Output Low Voltage --- --- 0.4 V IOL = 4mA

VOH Output High Voltage 2.4 --- --- V IOH = -4mA

Non-MCI TTL Outputs

(LINKLED#, ACTIVELED#, FULL/HALFLED#, FAULTLED#, MDINTR#)

VOL Output Low Voltage --- --- 0.4 V IOL = 2mA

VOH Output High Voltage 2.4 --- --- V IOH = -2mA

Receiver

VICM RX+/RX- Common mode Input Voltage --- 1.2 --- V 100 Ω Termination Across

Transmitter

VTD100 100TX+/- Differential Output Voltage 1.9 2.0 2.1 V Peak to Peak

ITD100 100TX+/- Differential Output Current │19││20││21│mA

VOH PECL Output Voltage – High VCC-

1.05

VCC-

0.88

VOL PECL Output Voltage – Low VCC-

1.81

VCC-

1.62

VIH PECL Input Voltage – High VCC-

1.16

VCC-

0.88

VIL PECL Input Voltage – Low VCC-

1.81

VCC-

1.48

IFD100 100FX+/- Differential Output Current │17││18││19│mA

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

28 Preliminary

Version: DM9331-DS-P02

September 21, 2001

A C Electrical Characterist ics & Timing Waveforms

TP Interface

Symbol Parameter Min. Typ. Max. Unit Conditions

tTR/F 100TX+/- Differential Rise/Fall Time 3.0 --- 5.0 ns

tTM 100TX+/- Differential Rise/Fall Time Mismatch 0 --- 0.5 ns

tTDC 100TX+/- Differential Output Duty Cycle

Distortion

0---0.5ns

tT/T 100TX+/- Differential Output Peak-to-Peak Jitter 0 --- 1.4 ns

XOST 100TX+/- Differential Voltage Overshoot 0 --- 5 %

Oscillator Timing

Symbol Parameter Min. Typ. Max. Unit Conditions

tCKC OSC Cycle Time 19.998 20 20.002 ns 50ppm

tPWH OSC Pulse Width High 8 10 12 ns

tPWL OSC Pulse Width Low 8 10 12 ns

MDC/MDIO Timing

Symbol Parameter Min. Typ. Max. Unit Conditions

t0MDC Cycle Time 80 --- --- ns

t1MDIO Setup Before MDC 10 --- --- ns When OUTPUT By STA

t2MDIO Hold After MDC 10 --- --- ns When OUTPUT By STA

t3MDC To MDIO Output Delay 0 --- 300 ns When OUTPUT By DM9331

MDIO timing when OUTPUT by STA

MDC

MDIO

10ns

(Min) t

10ns

(Min)

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

Preliminary 29

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MDIO timing when OUTPUT by DM9331

MDC

MDIO

0 - 300 ns

Auto-negotiation and Fast Link Pulse Timing Parameters

Symbol Parameter Min. Typ. Max. Unit Conditions

t1Clock/Data Pulse Width --- 100 --- ns

t2Clock Pulse To Data Pulse Period 55.5 62.5 69.5 us DATA = 1

t3Clock Pulse To Clock Pulse Period 111 125 139 us

t4FLP Burst Width - 2 - ms

t5FLP Burst To FLP Burst Period 8 24 ms

- Clock/Data Pulses in a Burst 17 33 pulse

Auto-negotiation and Fast Link Pulse Timing Diagram

FAST LINK

PULSES

Clock Pulse Data Pulse Clock Pulse

FLP Burst FLP Burst

FLP Bursts

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

30 Preliminary

Version: DM9331-DS-P02

September 21, 2001

TXD to TP or FX Transmit Latency Timing Diagra m

TXD [1:0]

TX±

TXD to TP or FX Transmit Latency Parameters

Symbol Parameter Min. Typ. Max. Unit Conditions

tdTXD[1:0] to TX± or FXTD± ( TX Latency ) - - 165 ns

TP or FX to RXD Receive Latency Timing Diagram

RXD [1:0]

RX±

TP or FX to RXD Receive Latency Parameters

Symbol Parameter Min. Typ. Max. Unit Conditions

tdRX± or FXRD± to RXD[1:0] ( RX Latency ) - - 205 ns

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

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A pplication Notes

Network Interface Signal Routing

Place the transformer as close as possible to the RJ-45

connector. Place all the 50Ω resistors as close as possible

to the DM9331 RX± and TX± pins. Traces routed from

RX± and TX± to the transformer should run in close pairs

directly to the transformer. The designer should be careful

not to place the transmit pair across the receive pair. As

always, vias should be avoided as much as possible. The

network interface should be void of any signals other than

the TX ± and RX ± pairs between the RJ-45 to the

transformer and the transformer to the DM9331. There

should be no power or ground planes in the area under the

network side of the transformer to include the area under the

RJ-45 connector. (Refer to Figure 5 and 6.) Keep chassis

ground away from all active signals. The RJ-45 connector

and any unused pin should be tied to chassis ground

through a resistor divider network and a 2KV bypass

capacitor.

The Band Gap resistor should be placed as physically close

to pins 47 and 48 as possible. (Refer to Figure 1, 2, 3-1, and

3-2). The designer should not run any high-speed signal

near the Band Gap resistor placement.

1. 100Base-TX Side Application

DM9331

RX+

RX-

TX+

TX-

BGRESG

BGRES

Transformer RJ45

1:1

75Ω

3.3V AVCC

0.1µF

0.1µF/2KV or 0.01µF/2KV

Chasis GND

6.8KΩ, 1%

50Ω

3.3V AVCC

AGND

Figure 1

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

32 Preliminary

Version: DM9331-DS-P02

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2. 100Base-TX Side (Power Reduction Application)

DM9331

RX+

RX-

TX+

TX-

BGRESG

BGRES

Transformer RJ45

1:1

1.25:1

75Ω

3.3V AVCC

0.1µF

0.1µF/2KV or 0.01µF/2KV

Chasis GND

8.5KΩ, 1%

78Ω

50Ω

3.3V AVCC

AGND

Figure 2

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100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

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3. 100Base-FX Side Application

DM9331

FXRD+

FXRD-

FXTD+

BGRESG

BGRES

3.3V Fiber

Transceiver

1 GND_RX

AGND

6.8KΩ, 1%

69Ω

FXTD-

2 RD+

3 RD-

4SD

5VCC_RX

6VCC_TX

7TD-

8TD+

9GND_TX

182Ω

FXVCC (3.3V)

182Ω

69Ω

FXVCC (3.3V)

127Ω

83Ω

127Ω

AGND

FXVCC (3.3V)

Figure 3-1

DM9331

FXRD+

FXRD-

FXTD+

BGRESG

BGRES

5V Fiber

Transceiver

1 GND_RX

AGND

6.8KΩ, 1%

62Ω

FXTD-

2 RD+

3 RD-

4SD

5VCC_RX

6VCC_TX

7TD-

8TD+

9GND_TX

268Ω

FXVCC (5V)

268Ω

62Ω

FXVCC (5V)

83Ω

59Ω

83Ω

AGND

FXVCC (5V)

68Ω

Figure 3-2

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

34 Preliminary

Version: DM9331-DS-P02

September 21, 2001

4. Power Decoupling Capac itors

Davicom Semiconductor recommends all the decoupling

capacitors for all power supply pins are placed as close as

possible to the power pads of the DM9331 (The best placed

distance is < 3mm from the above mentioned pins). The

recommended decoupling capacitance is 0.1µF or 0.01µF,

as required by the design layout.

DM9331

41 39

Figure 4

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

Preliminary 35

Version: DM9331-DS-P02

September 21, 2001

5. Ground Pl ane Layout

A single ground plane approach is recommended to

minimize EMI. Bad ground plane partitioning can cause

more EMI emissions that could make the network interface

card not compliant with specific FCC regulations (part 15).

Figure 5 shows a recommended ground layout scheme.

Figure 5

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

36 Preliminary

Version: DM9331-DS-P02

September 21, 2001

6. Power Plane Partitioning

The power planes are approximately illustrated in Figure 6.

The ferrite bead used should have an impedance at least 75

Ω at 100MHz. A suitable bead is the Panasonic surface

mound bead, part number EXCCL4532U or an equivalent.

A 10µF electrolytic bypass capacitors should be connected

between VCC and Ground at each side of the ferrite bead.

Figure 6

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

Preliminary 37

Version: DM9331-DS-P02

September 21, 2001

7. Media Converter Interface

Through the Media Converter Interface (MCI), the DM9331

connects to another DM9331 for the FX to TP media

converter or FX to FX, TP to TP repeater application.

DM9331

FXRD±

FXTD±

RXDV

RXD[0:1]

TXD[0:1]

TXEN

DM9331

RXDV

RXD[0:1]

TXEN

TXD[0:1]

TPSET0 TPSET1

TX±

RX±

FX mode TP mode

VCC

50MHz

OSCINOSCIN

4.7K

VCC

4.7K

DM9331

FXRD±

FXTD±

RXDV

RXD[0:1]

TXD[0:1]

TXEN

DM9331

RXDV

RXD[0:1]

TXEN

TXD[0:1] FXTD±

FXRD±

FX mode FX mode

50MHz

OSCINOSCIN

DM9331

RX±

TX±

RXDV

RXD[0:1]

TXD[0:1]

TXEN

DM9331

RXDV

RXD[0:1]

TXEN

TXD[0:1]

TPSET0 TPSET1

TX±

RX±

TP mode TP mode

50MHz

OSCINOSCIN

TPSET0 TPSET1

VCC

4.7K

VCC

4.7K

VCC

4.7K

VCC

4.7K

Figure 7

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

38 Preliminary

Version: DM9331-DS-P02

September 21, 2001

8. Link Fault propa gation Applica tion

The DM9331 will propagate link fault signals from

media to another DM9331. If link fault happens, the

DM9331 will send out fault signal to another DM9331.

In FX mode, there are two types of link failures,

receive link failure or remote fault (receive far end

fault). In the event of a fiber receive link failure, the

DM9331 will send out an FX fault signal. The DM9331

will send out a far end fault signal to the fiber optic

media, if the DM9331 receive the fault signal from the

other device.

In TP mode, in the event of a TP receive link failure,

the DM9331 will send out a TP fault signal. The

DM9331 will stop to transmit idle signal to the CAT5

media, if the DM9331 receive the fault signal from the

other device.

DM9331

FXRD±

FXTD±

LNKFAULTEN

LNKFAULT#

FXFAULT

(MCI)

DM9331

(MCI)

LNKFAULT#

LNKFAULTEN

TPFAULT

TPSET0 TPSET1

TX±

RX±

FX mode TP mode

VCC VCC

VCC

4.7K

VCC

4.7K

DM9331

FXRD±

FXTD±

LNKFAULTEN

LNKFAULT#

FXFAULT

(MCI)

DM9331

(MCI)

LNKFAULT#

LNKFAULTEN

FXFAULT FXTD±

FXRD±

FX mode FX mode

VCC VCC

DM9331

RX±

TX±

LNKFAULTEN

LNKFAULT#

TPFAULT

(MCI)

DM9331

(MCI)

LNKFAULT#

LNKFAULTEN

TPFAULT

TPSET0 TPSET1

TX±

RX±

TP mode TP mode

VCC VCC

TPSET0 TPSET1

VCC

4.7K

VCC

4.7K

VCC

4.7K

VCC

4.7K

Figure 8

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

Preliminary 39

Version: DM9331-DS-P02

September 21, 2001

9. Media Converter or Repeater Application

The DM9331 chip set can easily use media converters or

repeaters for long distance device connection. You can use

two media converters to connect two devices whose

distance is 2.2km. See Figure 9-1. If the distance is more

than 2.2km, you can add an FX repeater to extend distance.

See Figure 9-2. In the last miles, if the distance of the user

device is more than 100m, you can add TP repeaters to

extend the distance to 400m. See figure 9-3.

DM9331DM9331DM9331DM9331

DM9331DM9331

DM9331DM9331DM9331DM9331

DM9102A

NIC

DM9331DM9331

extend the distance

ConverterConverter

Converter Repeater Converter

RepeaterRepeaterRepeater User

∫∫

Cat5

extend the distance

Cat5

Cat5 Cat5Fiber Optic

Fiber Optic

TP FX FX TP

FX TPFX FXTP FX

TP TPTP TPTP TP

Figure 9-3

Figure 9-2

Figure 9-1

under full-duplex mode

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

40 Preliminary

Version: DM9331-DS-P02

September 21, 2001

10. Link Fault P ropagation LED Display

Since the media converter is a “dummy” device, the link fault

propagation becomes very important. The devices at the

both ends need to know whether the link is OK or Non-OK

on the whole path.

Figure 10 shows the DM9331 to the DM9331 connection.

The whole path is separated into local device (LD), local

converter (LC), remote converter (RC) and remote device

(RD), and three segments of transmit and receive

connection. Table 10 lists the LED status of all devices. It

shows the current link status of all the devices when they are

at auto-negotiation modes.

DM9331DM9331DM9331DM9331

Remote ConverterLocal Converter

LT RTFT

TP FX FX TP

Local Device Remote Device

FRLR

LD LC RC RD

Figure 10

Local

device Local Converter Remote Converter Remote

device

TP side FX side FX side TP side

Condition

(auto-

negotiation ) Link

LED Link LED Fault LED Link LED Fault LED Link LED Fault LED Link LED Fault LED

Link

LED

LT disconnect off off on on off on on off off off

LR disconnect off off off on off on off on off on

LT & LR

disconnect

off off on on off on on off off off

FT disconnect off off off on on off on off off off

FR disconnect off off off off on on on off off off

FT & FR

disconnect

off off off off on off on off off off

RT disconnect on on off on off on off off off off

RR disconnect off off off on on on off off on off

RT & RR

disconnect

off off off on on on off off on off

Table 10

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

Preliminary 41

Version: DM9331-DS-P02

September 21, 2001

Magnetics Selection Guide

Refer to Table 2 for transformer requirements. Transformers

meeting these requirements are available from a variety of

magnetic manufacturers. Designers should test and qualify

all magnetics before using them in an application. The

transformers listed in Table 2 are electrical equivalents, but

may not be pin-to-pin equivalents.

Manufacturer Part Number

Pulse Engineering PE-68515, H1078, H1012

H1102

Delta LF8200, LF8221x

YCL 20PMT04, 20PMT05

Halo TG22-3506ND, TD22-3506G1, TG22-S010ND

TG22-S012ND

Nano Pulse Inc. NPI 6181-37, NPI 6120-30, NPI 6120-37

NPI 6170-30

Fil-Mag PT41715

Bel Fuse S558-5999-01

Valor ST6114, ST6118

Macronics HS2123, HS2213

Tab le 2

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

42 Preliminary

Version: DM9331-DS-P02

September 21, 2001

Package Information

LQFP 48L (F.P. 2mm) Outline Dimensions unit: inches/mm

Sy mbol Dimensions in inches Dimensions in mm

Min. Nom. Max. Min. Nom. Max.

A - - 0.063 - - 1.6

A10.002 - 0.006 0.05 - 0.15

A20.053 0.055 0.057 1.35 1.40 1.45

b 0.007 0.009 0.011 0.17 0.22 0.27

b1 0.007 0.008 0.009 0.17 0.20 0.23

C 0.004 - 0.008 0.09 - 0.20

C1 0.004 - 0.006 0.09 - 0.16

D 0.354BSC 9.00BSC

D1 0.276BSC 7.00BSC

E 0.354BSC 9.00BSC

E1 0.276BSC 7.00BSC

e 0.020BSC 0.50BSC

L 0.018 0.024 0.030 0.45 0.60 0.75

L1 0.039REF 1.00REF

y 0.004MAX 0.1MAX

Θ0º - 12º 0º - 12º

Notes:

1. To be determined at seating plane.

2. Dimensions D1 and E 1do not include mold protrusion.

D1 and E1 are maximum plastic body size dimensions

including mold mismatch.

3. Dimensions b do not include dambar protrusion. Total in

excess of the b dimension at maximum material condition.

Dambar cannot be located on the lower radius of the foot.

4. Exact shape of each corner is optional.

5. These dimensions apply to the flat section of the lead

between 0.10mm and 0.25mm from the lead tip.

6. A1 is defined as the distance from the seating plane to the

lowest point of the package body.

7. Controlling dimension: millimeter.

8. Reference documents: JEDEC MS-026 , BBC.

DM9331

100 Mbps Twisted Pair /Fiber Ethernet Media C onverter Chip

Preliminary 43

Version: DM9331-DS-P02

September 21, 2001

Ordering Information

Part Number Pin Count Package

DM9331E 48 LQFP

Disclaimer

The information appearing in this publication is believed to

be accurate. Integrated circuits sold by DAVICOM

Semiconductor are covered by the warranty and patent

indemnification provisions stipulated in the terms of sale only.

DAVICOM makes no warranty, express, statutory, implied or

by description regarding the information in this publication or

regarding the information in this publication or regarding the

freedom of the described chip(s) from patent infringement.

FURTHER, DAVICOM MAKES NO WARRANTY OF

MERCHANTABILITY OR FITNESS FOR ANY PURPOSE.

DAVICOM deserves the right to halt production or alter the

specifications and prices at any time without notice.

Accordingly, the reader is cautioned to verify that the data

sheets and other information in this publication are current

before placing orders. Products described herein are

intended for use in normal commercial applications.

Applications involving unusual environmental or reliability

requirements, e.g. military equipment or medical life support

equipment, are specifically not recommended without

additional processing by DAVICOM for such applications.

Please note that application circuits illustrated in this

document are for reference purposes only.

DAVICOM’s terms and conditions printed on the order

acknowledgment govern all sales by DAVICOM.

DAVICOM will not be bound by any terms inconsistent with

these unless DAVICOM agrees otherwise in writing.

Acceptance of the buyer’s orders shall be based on these

terms.

Company Overv iew

DAVICOM Semiconductor, Inc. develops and manufactures

integrated circuits for integration into data communication

products. Our mission is to design and produce IC products

that are the industry’s best value for Data, Audio, Video, and

Internet/Intranet applications. To achieve this goal, we have

built an organization that is able to develop chipsets in

response to the evolving technology requirements of our

customers while still delivering products that meet their cost

requirements.

Products

We offer only products that satisfy high performance

requirements and which are compatible with major hardware

and software standards. Our currently available and soon to

be released products are based on our proprietary designs

and deliver high quality, high performance chipsets that

comply with modem communication standards and Ethernet

networking standards.

Contact Windows

For additional information about DAVICOM products, contact the sales department at:

Headquarters

Hsin-chu Office:

3F, No. 7-2, Industry E. Rd., IX,

Science-based Park,

Hsin-chu City, Taiwan, R.O.C.

TEL: 886-3-5798797

FAX: 886-3-5798858

Taipei Sales & Marketing Office:

8F, No. 3, Lane 235, Bao-chiao Rd.,

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TEL: 02-29153030

FAX: 02-29157575

Email: sales@davicom.com.tw

Web Site: http://www.davicom.com.tw

WARNING

Conditions beyond those listed for the absolute maximum may destroy or damage the products. In addition, conditions for sustained periods at near

the limits of the operating ranges will stress and may temporarily (and permanently) affect and damage structure, performance and/or function.