Microchip Technology EVB8740 User manual

SMSC EVB8740/EVB8741 Revision 1.0 (04-29-13)

USER MANUAL

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EVB8740/EVB8741 Evaluation Board User Manual

Revision 1.0 (04-29-13) 2 SMSC EVB8740/EVB8741

USER MANUAL

1 Introduction

The LAN8740A/LAN8741A is a low-power, 10BASE-T/100BASE-TX physical layer (PHY) transceiver

with variable I/O voltage that is compliant with the IEEE 802.3, 802.3u, and 802.3az (Energy Efficient

Ethernet) standards. Energy Efficient Ethernet (EEE) support results in significant power savings during

low link utilizations.

The EVB8740/EVB8741 is a PHY Evaluation Board (EVB) that interfaces a Media Independent

Interface (MII) MAC controller to the LAN8740A/LAN8741A Ethernet MII PHY via a standard 40-pin

MII connector. The LAN8740A/LAN8741A is connected to an RJ45 Ethernet jack with integrated

magnetics for 10/100 connectivity. A simplified block diagram of the EVB8740/EVB8741 can be seen

in Figure 1.1.

Note: Though the LAN8740A/LAN8741A supports an RMII mode of operation, the

EVB8740/EVB8741 evaluation board does not support this mode.

1.1 References

Concepts and material available in the following documents may be helpful when reading this

document. Visit www.smsc.com for the latest documentation.

SMSC LAN8740A/LAN8741A Datasheets

AN 25.3 Migrating from the LAN8710A/LAN8720A to the LAN8740/LAN8741/LAN8742

AN 8.13 Suggested Magnetics

SMSC LAN8740A/LAN8741A Evaluation Board Schematics

Figure 1.1 EVB8740/EVB8741 Block Diagram

SMSC

LAN8740A/

LAN8741A

10/100

Ethernet

Magnetics

& RJ45

EVB8740/EVB8741

MII Ethernet

40-pin

Connector

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USER MANUAL

2 Board Details

This section includes the following EVB8740/EVB8741 board details:

Power

Configuration

Mechanicals

2.1 Power

2.1.1 +5V Power

Power is normally supplied to the EVB8740/EVB8741’s +3.3V regulator externally via the +5V power

pins of the MII connector. If desired, the EVB8740/EVB8741 can be powered without +5V present on

the MII connector by supplying +5V to the TP2 (red) test point with ground connected to the TP4

(black) test point.

Note: Before connecting an external power supply to TP2, ensure power is not present on the MII

connector’s +5V pins. Connecting +5V simultaneously via the MII connector and TP2 may

result in permanent damage to the board.

2.1.2 VDDIO Power

The LAN8740A/LAN8741A’s VDDIO power may be supplied at a voltage other than +3.3V by

depopulating resistor R12 and supplying +1.6V to +3.6V externally via test point TP5 (purple), with

ground connected to the TP4 (black) test point.

Note: Before connecting an external power supply to TP5, ensure that resistor R12 has been

removed. Connecting an external power supply to TP5 while resistor R12 is populated may

result in permanent damage to the board.

2.1.3 +1.2V Power

The LAN8740A/LAN8741A’s internal +1.2V regulator can be optionally disabled. Refer to Section 2.2.4,

"Internal +1.2V Regulator Configuration (REGOFF)," on page 6 for additional information.

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Revision 1.0 (04-29-13) 4 SMSC EVB8740/EVB8741

USER MANUAL

2.2 Configuration

The following sub-sections describe the various board features and configuration settings. A top view

of the EVB8740/EVB8741 is shown in Figure 2.1.

2.2.1 PHY Address Configuration

The EVB8740/EVB8741 allows the user to configure the default PHY address at power-up via the

PHYAD[2:0] configuration straps. Ta ble 2. 1 details the proper configuration required for each PHY

address value. By default, all EVB8740/EVB8741 PHY address straps are configured to a value of “0”.

Figure 2.1 Top View of the EVB8740/EVB8741

Table 2.1 PHYAD[2:0] Resistor Configuration

PHYAD[2:0]

PHYAD[2:0] PULL-UP/DOWN RESISTORS

PHYAD2 PHYAD1 PHYAD0

R26R35R25R36R24R37

000 (Default) Depopulate Populate Depopulate Populate Depopulate Populate

001 Depopulate Populate Depopulate Populate Populate Depopulate

010 Depopulate Populate Populate Depopulate Depopulate Populate

011 Depopulate Populate Populate Depopulate Populate Depopulate

100 Populate Depopulate Depopulate Populate Depopulate Populate

101 Populate Depopulate Depopulate Populate Populate Depopulate

MII

Testpoints

VDDCR

Testpoint

Reset

Button

Integrated

RJ45 +

Magnetics

SPEED &

LINK/ACT

LEDs

(integrated in

magjack)

40-pin MII

connector

(P1)

VDDIO

Testpoint

+5V

Testpoint

+3.3V

Testpoint

SMSC

LAN8740A/

LAN8741A

GND

Testpoint

JP1 – JP4

AVDD_ETH

Testpoint

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USER MANUAL

2.2.2 Reset Mode Configuration

The EVB8740/EVB8741 can be configured to reset into a specific mode of operation at power-up via

the MODE[2:0] configuration straps. Ta bl e 2. 2 details the proper configuration required for each mode.

By default, all EVB8740/EVB8741 MODE[2:0] straps are configured to a value of “1”.

Note: For additional details on each mode of operation, refer to the LAN8740A/LAN8741A datasheet.

110 Populate Depopulate Populate Depopulate Depopulate Populate

111 Populate Depopulate Populate Depopulate Populate Depopulate

Table 2.2 MODE[2:0] Resistor Configuration

MODE[2:0]

MODE[2:0] PULL-UP/DOWN RESISTORS

MODE2 MODE1 MODE0

R28R33R29R32R30R31

000

10BASE-T

Half Duplex

Auto-neg disabled

Depopulate Populate Depopulate Populate Depopulate Populate

001

10BASE-T

Full Duplex

Auto-neg disabled

Depopulate Populate Depopulate Populate Populate Depopulate

010

100BASE-TX

Half Duplex

Auto-neg disabled

Depopulate Populate Populate Depopulate Depopulate Populate

011

100BASE-TX

Full Duplex

Auto-neg disabled

Depopulate Populate Populate Depopulate Populate Depopulate

100

100BASE-TX

Half Duplex

Auto-neg enabled

Populate Depopulate Depopulate Populate Depopulate Populate

101

Repeater mode

Populate Depopulate Depopulate Populate Populate Depopulate

110

Power Down mode

Populate Depopulate Populate Depopulate Depopulate Populate

111 (Default)

All capable.

Auto-neg enabled

Populate Depopulate Populate Depopulate Populate Depopulate

Table 2.1 PHYAD[2:0] Resistor Configuration (continued)

PHYAD[2:0]

PHYAD[2:0] PULL-UP/DOWN RESISTORS

PHYAD2 PHYAD1 PHYAD0

R26R35R25R36R24R37

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2.2.3 nINT/TXER/TXD4 Pin Configuration (nINTSEL)

The nINT, TXER, and TXD4 functions share a common LAN8740A/LAN8741A pin. This pin can

operate in two functional modes: nINT (Interrupt) Mode and TXER/TXD4 Mode. TXER is also used in

EEE mode as TXER when TXEN = 1, and LPI when TXEN = 0. The nINTSEL configuration strap is

used to select one of these two modes. The EVB8740/EVB8741 must be properly configured for each

mode as follows:

nINT Mode

Depopulate R46.

Depopulate the 2-3 positions of JP3 and JP4.

Populate the 1-2 positions of JP3 and JP4 to pull-up the nINTSEL strap (nINT mode).

TXER/TXD4 Mode (Default EVB8740/EVB8741 Mode)

Depopulate the 1-2 positions of JP3 and JP4.

Populate the 2-3 positions of JP3 and JP4 to pull-down the nINTSEL strap (TXER/TXD4 mode).

Populate R46.

Note: The nINTSEL configuration strap shares functionality with LED2. Therefore, LED2 may function

active-high or active-low depending on the nINTSEL configuration. For additional information

on the functionality of the nINT/TXER/TXD4 and LED2/nINTSEL pins, refer to the

LAN8740A/LAN8741A Datasheet and LAN8740A/LAN8741A schematics.

2.2.4 Internal +1.2V Regulator Configuration (REGOFF)

The LAN8740A/LAN8741A provides the ability to disable the internal +1.2V regulator. When the

regulator is disabled, an external +1.2V must be supplied to the VDDCR pin (via TP3). Configuration

of the internal regulator is controlled by the REGOFF configuration strap. The EVB8740/EVB8741 must

be properly configured for each mode as follows:

Internal +1.2V Regulator Enabled (Default EVB8740/EVB8741 Mode)

Depopulate the 2-3 positions of JP1 and JP2.

Populate the 1-2 positions of JP1 and JP2 to pull-down the REGOFF strap (enable regulator).

Internal +1.2V Regulator Disabled

Depopulate the 1-2 positions of JP1 and JP2.

Populate the 2-3 positions of JP1 and JP2 to pull-up the REGOFF strap (disable regulator).

Note: The REGOFF configuration strap shares functionality with LED1. Therefore, LED1 may

function active-high or active-low depending on the REGOFF configuration. For additional

information on the LED1/REGOFF pin and the disabling of the internal 1.2V regulator (power

sequencing requirements, etc.), refer to the LAN8740A/LAN8741A Datasheet and

LAN8740A/LAN8741A schematics.

2.2.5 Clock Configuration

The EVB8740/EVB8741 can be clocked via the onboard crystal oscillator or an optional external clock.

Crystal Oscillator (Default)

The 25 MHz crystal Y1 is connected to the internal oscillator of the LAN8740A/LAN8741A. A PLL

circuit in the LAN8740A/LAN8741A generates all the timing required by the PHY.

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USER MANUAL

External Clock

The EVB8740/EVB8741 can be configured to use an external clock by removing crystal Y1 and resistor

R20. A 25MHz +3.3V signal may then be applied to pin 1 of Y1 (which connects to pin 5 of the

LAN8740A/LAN8741A). Pin 2 of Y1 (which connects to pin 4 of the LAN8740A/LAN8741A) should be

left floating when using an external clock.

2.2.6 LEDs

Note: LED1 and LED2 are located inside the RJ45 connector. LED1 and LED2 may function active-

high or active-low depending on the configuration of the REGOFF and nINTSEL straps,

respectively. Refer to the LAN8740A/LAN8741A Datasheet and LAN8740A/LAN8741A

schematics for additional information.

2.2.7 Test Points

Note 2.1 VDDCR is the internal +1.2V regulated output. When REGOFF is enabled, the internal

1.2V regulator is disabled. In this case, an external 1.2V regulator must be supplied to test

point TP3.

Note 2.2 The LAN8740A/LAN8741A’s VDDIO power may be supplied externally at a voltage other

than +3.3V as described in Section 2.1, "Power," on page 3.

Table 2.3 LEDs

REFERENCE COLOR INDICATION

LED1 Green

Link/Activity

Active when the PHY has established a valid link with a link partner

and blinks when activity is detected.

LED2 Yellow

Speed

Active when a 100BASE-TX link has been established. Inactive when

a 10BASE-T link has been established or during line isolation.

Table 2.4 Test Points

TEST POINT DESCRIPTION CONNECTION

TP1 +3.3V Test Point (Orange) +3.3V

TP2 +5.0V Test Point (Red) +5.0V

TP3 +1.2V VDDCR Test Point (Unpopulated)

(Note 2.1)+1.2V

TP4 Ground Test Point (Black) Ground

TP5 VDDIO Test Point (Purple) +3.3V (Note 2.2)

TP6 nPME Test Point (Unpopulated) nPME (RXD2/nPME/RMIISEL)

TP7 AVDD Test Point (White) AVDD

TP8 AVDD_ETH Test Point (Yellow) AVDD_ETH

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USER MANUAL

2.2.8 System Connections

Note 2.3 Resistor R11 acts as a pull-up on the MDIO pin. In most situations, the MAC circuitry

provides this pull-up and R11 is not required.

Note 2.4 Pins 11 and 21 of the J1 header must be configured to properly connect to the

nINT/TXER/TXD4 pin of the LAN8740A/LAN8741A. Depending on the configured mode,

nINT or TXER/TXD4, R46 must be depopulated or populated. Refer to Section 2.2.3,

"nINT/TXER/TXD4 Pin Configuration (nINTSEL)," on page 6 for additional information.

Table 2.5 System Connections

PLUG/HEADER DESCRIPTION PART

T1 RJ45 with Integrated LEDs Pulse J0011D01BNL

J1 2x14 MII Header

Note: Refer Table 2.6 to for a full pin list Adam Tech PH2-28-U-A

P1 40-pin Female MII Connector

Note: Refer Table 2.7 to for a full pin list Tyco 5173278-2

Table 2.6 J1 - 2x14 MII Header Pinout

HEADER

PIN DESCRIPTION

HEADER

PIN DESCRIPTION

1nRST 15TXD1

2MDIO(Note 2.3)16TXD2

3MDC 17TXD3

4 RXD3/PHYAD2 18 CRS_DV/COL/MODE2

5 RXD2/RMIISEL 19 CRS

6RXD1/MODE1 20 Ground

7RXD0/MODE0 21 nINT (Note 2.4)

8 RXDV 22 VDDIO

9 RXCLK/PHYAD1 23 +3.3V

10 RXER/RXD4/PHYAD0 24 Ground

11 TXER/TXD4 (Note 2.4) 25 Ground

12 TXCLK 26 Ground

13 TXEN 27 Ground

14 TXD0 28 Ground

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SMSC EVB8740/EVB8741 9 Revision 1.0 (04-29-13)

USER MANUAL

Note 2.5 To use the TXER signal from the MAC, the nINT/TXER/TXD4 pin and R46 must be

configured properly. Refer to Section 2.2.3, "nINT/TXER/TXD4 Pin Configuration

(nINTSEL)," on page 6 for additional information.

2.2.9 Switches

Table 2.7 P1 - 40-Pin Female MII Connector Pinout

PIN DESCRIPTION PIN DESCRIPTION PIN DESCRIPTION PIN DESCRIPTION

1 +5V 11 TXER (Note 2.5)21 +5V 31 GND

2 MDIO 12 TXCLK 22 GND 32 GND

3 MDC 13 TXEN 23 GND 33 GND

4 RXD3 14 TXD0 24 GND 34 GND

5 RXD2 15 TXD1 25 GND 35 GND

6 RXD1 16 TXD2 26 GND 36 GND

7 RXD0 17 TXD3 27 GND 37 GND

8 RXDV 18 COL 28 GND 38 GND

9 RXCLK 19 CRS 29 GND 39 GND

10 RXER 20 +5V 30 GND 40 +5V

Table 2.8 Switches

SWITCH DESCRIPTION FUNCTION

S1 Reset switch When pressed, triggers a board reset.

EVB8740/EVB8741 Evaluation Board User Manual

Revision 1.0 (04-29-13) 10 SMSC EVB8740/EVB8741

USER MANUAL

2.3 Mechanicals

Figure 2.2 details the EVB8740/EVB8741 mechanical dimensions.

Figure 2.2 EVB8740/EVB8741 Mechanicals

1.450

3.000

Ø0.125

TOP VIEW

0.200

0.175

0.200

0.175

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