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Texas Instruments DP83825EVM User guides
User's Guide
SNLU239 – December 2018
DP83825EVM User’s Guide
This User’s Guide discusses how to properly operate and configure the DP83825EVM.
SNLU239 – December 2018
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DP83825EVM User’s Guide
Copyright © 2018, Texas Instruments Incorporated
1
Definitions
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1
2
3
4
5
Contents
Definitions .................................................................................................................... 2
Introduction ................................................................................................................... 3
Board Setup Details ......................................................................................................... 8
Configurations Options ...................................................................................................... 9
REACH Compliance ....................................................................................................... 12
1
DP83825EVM – Top Side .................................................................................................. 3
2
DP83825EVM – Bottom Side
3
LDO Operation
List of Figures
4
5
6
7
8
............................................................................................. 4
.............................................................................................................. 5
Supply Selection Jumpers - LDO .......................................................................................... 6
Supply Selection Jumpers - LDO .......................................................................................... 6
DP83825EVM Block Diagram .............................................................................................. 8
Strap Pins ................................................................................................................... 10
LED_0 Strap ................................................................................................................ 10
List of Tables
..................................................................................................................
1
Terminology
2
EVM Applications ............................................................................................................ 9
2
3
Strap Value ................................................................................................................... 9
4
Strap Options Table ........................................................................................................ 11
Trademarks
All trademarks are the property of their respective owners.
1
Definitions
Table 1. Terminology
ACRONYM
2
DEFINITION
PHY
Physical Layer Transceiver
MAC
Media Access Controller
SMI
Serial Management Interface
MDIO
Management Data I/O
MDC
Management Data Clock
RGMII
Reduced Gigabit Media Independent Interface
SFD
Start-of-Frame Detection
VDDA
Analog Core Supply Rail
VDDIO
Digital Supply Rail
PD
Pulldown
PU
Pullup
MC
Microcontroller
DP83825EVM User’s Guide
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Introduction
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2
Introduction
The DP83825 is a smallest form factor, lowest power Ethernet Physical Layer transceiver with integrated
PMD sublayers to support 10BASE-Te, 100BASE-TX Ethernet protocols. The DP83825 interfaces directly
to twisted pair media via an external transformer. It interfaces to the MAC layer through Reduced MII
(RMII) both in Master and Slave mode. 50 MHz clock in RMII Master mode is synchronized to MDI derived
clock to improve the jitter in the system. The DP83825EVM will demonstrate all features of DP83825. The
EVM will support 10BASE-Te and 100BASE-TX Ethernet protocols. The EVM will have connections to use
the DP83825 RMII pins through header pins.
2.1
Key Features
•
•
•
•
•
•
•
•
•
100Base-TX, 10Base-Te
RMII Onboard Clock
Output Clock
Onboard MSP430F5529 for easy MDIO Register Access
LDO and External Power Supply Options
Status LEDs
Variable I/O Voltage Range: 1.8-V and 3.3-V
Bootstraps for Hardware Configuration
100BASE-TX Data Transfer Over 150 Meters CAT5 Cable
Figure 1. DP83825EVM – Top Side
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Introduction
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Figure 2. DP83825EVM – Bottom Side
4
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Introduction
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2.2
Operation – Quick Setup
2.2.1
Power Supply
The EVM can be supplied power via multiple options. Single supply operation uses on-board LDOs to
generate the voltages required for operating various sections of the EVM (PHY, MSP430 etc). Power can
also be supplied externally to individual voltage rails.
2.2.1.1
LDO Supply
The EVM can be used in LDO operation by providing power by using power supply turrets or USB
connector. The following jumper connections need to be connected to configure the board for LDO
operation.
Figure 3. LDO Operation
•
•
•
For Turret, connect jumper to position 2-3 on J2 connector as shown in Figure 3 and supply power
through ‘5V-12V’ and ‘GND’ turrets.
For USB power, connect jumper to position 1-2 on J2 connector as shown in Figure 3 and supply
power through J1 USB connector.
On the VDD3V3, VDDIO, and MSP-IO connections ensure that the jumpers are populated on position
1-2 for all three connectors shown in Figure 4.
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Introduction
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Figure 4. Supply Selection Jumpers - LDO
2.2.1.2
External Supply
DP83825EVM provides the option to power individual voltage rails from external power source giving
customers more flexibility with EVM testing. ‘VDD3V3’, ‘VDDIO’, and ‘MSP-IO’ connectors shown above
are used to switch individual rails from LDO source to External source. Connect jumper between pin 2-3 to
switch from LDO supply to External power source. Then supply power through corresponding pin on J8.
Figure 5. Supply Selection Jumpers - LDO
For example: If VDD3V3 needs to be supplied externally, switch the jumper on VDD3V3 connector from
position 1-2 to 2-3. Then supply 3.3V external power through pin 5 on J8.
6
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Introduction
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2.2.2
Software
The on-board MSP430 comes pre-programmed and ready to use. When using this EVM for the first time
on a Windows 7 (or above) PC, MSP430 drivers and USB2MDIO software utility will have to be installed.
USB2MDIO software can be used for accessing registers.
2.2.2.1
MSP430 Driver
Install the latest MSP430 drive from this website: http://softwaredl.ti.com/msp430/msp430_public_sw/mcu/msp430/MSP430_FET_Drivers/latest/index_FDS.html .
2.2.2.2
USB2MDIO Software
Download the software from http://www.ti.com/tool/usb-2-mdio .
The webpage also contains User’s Guide for installing and using the software. Because MSP430 is on
board the EVM, it is not required to purchase a separate MSP430 Launchpad kit and connect to the PHY
using wires. The entire EVM can be powered and controlled via USB connector. MSP430 and USB2MDIO
utility can be used even when power is not supplied via USB.
Incase the onboard MSP430 cannot be used due to some reason, MDIO and MDC pins are also broken
out on J10 connector. Customers can connect a MSP430 launchpad or their own MDIO-MDC utility on
J10 to access the PHY registers.
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Board Setup Details
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3
Board Setup Details
3.1
Block Diagram
Turrets
USB
External Supply
Header
3.3V
LDO
Jumper
RMII Header
Strap
Resistors
I/O 3.3V
Clock-Out
SMA
MDC
DP83825
DUT
RESET
MDIO
SMI
Connector
25MHz Clock in
LEDs
ESD
Diodes
Magnetics
RJ-45
Figure 6. DP83825EVM Block Diagram
8
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Board Setup Details
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3.2
EVM High Level Summary
Table 2. EVM Applications
NO.
1
DP83825 MODE
RMII to Copper
APPLICATIONS
HOW TO USE
Run traffic between RMII and Copper.
Connect to DP83822 EVM or MAC System
using Header pins.
Perform IEEE and UNH compliance testing
Using onboard MSP430 and software.
Run EMI/EMC Test on EVM
Use internal PRBS and loopback. MSP430
launchpad can be used for register
access.
Measure Power Dissipation
Connect external power supplies.
External MAC loopback
Connect external MAC to headers and use
MAC loopback register settings
50MHz output clock
Optional Clock out SMA
2
RMII Loopback
Data received by the PHY can be looped back
through the RMII interface without needing a
MAC.
Use jumpers to connect TXD0->RXD0,
TXD1->RXD1, and TXEN->RXDV.
3
Repeater Mode
RMII back to back as range extender.
Two EVMs can be connected back to back
using custom header cable.
4
Low Power modes
4
Configurations Options
4.1
Strap Options
Demonstrate EEE
Straps to enable EEE.
Demonstrate Sleep and Power down mode
Use MSP430 launchpad to activate low
power mode
All straps are only two level straps in DP83825. DP83825 contains internal pull down resistors on the strap
pins. The EVM takes advantage of this feature and has only pull up resistors on the board. When
DP83825 strap pins are using internal pull down the corresponding pin is strapped to ‘0’ and when the
strap pin has an external pull up resistor connected, the corresponding pin will be strapped to ‘1’. J14,
J16, J17, J18 are used as pull up strap jumper connectors as shown in the picture below. When any strap
pin needs to be strapped to ‘0’ on the EVM, disconnect the corresponding jumper. When a strap pin needs
to be strapped to ‘1’, populated the corresponding jumper.
Table 3. Strap Value
STRAP VALUE
'1'
'0'
Resistor Pull Up
2.49 kΩ
Open
Resistor Pull Down
Open
2.49 kΩ (optional)
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Configurations Options
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Figure 7. Strap Pins
The LED_0 pin also has a strap. Because LED pins have automatic polarity, separate LEDs are used on
the EVM depending on LED_0 pin being strapped high or low. In position 1-2 LED_0 will be pulled low (0)
and in position 2-3 LED_0 will be pulled high (1).
Figure 8. LED_0 Strap
10
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Configurations Options
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Table 4. Strap Options Table
PIN NAME
STRAP NAME
PIN NO
DEFAULT
LED_0
ANEG_DIS
4
0
RX_D1
RMII_MAS
17
0
RX_D0
PHY_AD[0]
18
0
CRS_DV
PHY_AD[1]
20
0
RX_ER
AMDIX_DIS
22
0
VALUE
DESCRIPTION
0
Enable Auto negotiation
1
Disable Auto negotiation
0
RMII Master Mode
1
RMII Slave Mode
0
PHY_AD[0] = 0
1
PHY_AD[0] = 1
0
PHY_AD[1] = 0
1
PHY_AD[1] = 1
0
AMDIX Enabled
1
AMDIX Disabled
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REACH Compliance
5
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REACH Compliance
In compliance with the Article 33 provision of the EU REACH regulation we are notifying you that this EVM
includes component(s) containing at least one Substance of Very High Concern (SVHC) above 0.1%.
These uses from Texas Instruments do not exceed 1 ton per year. The SVHC’s are:
Component Manufacturer
Component Part Number
SVHC Substance
SVHC CAS
Murata
CSTCR4M00G15L99-R0
Lead titanium zirconium oxide
(Pb(Ti,Zr)O3)
12626-81-2
This component is used only in the prototype version of the EVM and will be replaced in the next revision.
12
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