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Using Ethernet with OSD335x-

AM335x System in Package

Rev.1 5/23/2019

Octavo Systems LLC

Copyright 2019

1

Introduction

The Texas Instruments AM335x processor used in the OSD335x Family of System in
Package Devices supports up to two independent Gigabit Ethernet ports (10/100/1000
Mbps). This application note will help you quickly get started interfacing an Ethernet
PHY with the

OSD335x, the AM335x System in Package, Family of Devices

. This

document will showcase reference designs, which can be used as design examples,
make recommendations on layout, device trees and provide tips on debugging AM335x
Ethernet issues.

Notice:

The information provided within this document is for informational use only.

Octavo Systems provides no guarantees or warranty to the information contained.

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Содержание OSD335 AM335 Series

Страница 1: ...s application note will help you quickly get started interfacing an Ethernet PHY with the OSD335x the AM335x System in Package Family of Devices This document will showcase reference designs which can...

Страница 2: ...s Using AM335x Ethernet 2 2 2 Additional Ethernet PHYs 3 3 Design Example and Recommendations for Using Ethernet with the AM335x System in Package 4 3 1 Schematics 4 3 2 Layout 7 3 2 1 Dual Ethernet E...

Страница 3: ...Y are 1 Power Consumption 2 Throughput Speed 10 100 1000Mbps 3 Package type and size 4 Driver support 5 Hardware Errata 6 Ease of availability 2 1 Reference Designs Using AM335x Ethernet Reference Des...

Страница 4: ...struments http www ti com interface ethernet phy overview html Microchip https www microchip com design centers ethernet ethernet devices products ethernet phys Marvell https www marvell com transceiv...

Страница 5: ...ics and layout Reference design files for this design will be available in the future Please sign up for documentation updates to be notified when they are available 3 1 Schematics When connecting an...

Страница 6: ...5 Using Ethernet with OSD335x AM335x System in Package Rev 1 2 18 2019 Octavo Systems LLC Copyright 2019 Figure 1 PHY 1 Ethernet Connections...

Страница 7: ...nections When creating a dual AM335x Ethernet design it is critical that each PHY have a different MDIO address This will allow the single MDIO bus to communicate and configure each PHY Additionally i...

Страница 8: ...out design 1 Use only 45o 135o angles in traces to avoid signal reflections 2 Trace widths should be constant to maintain uniform impedance 3 Length match TX_CLK TXDx and RX_CLK RXDx signals between A...

Страница 9: ...8 Using Ethernet with OSD335x AM335x System in Package Rev 1 2 18 2019 Octavo Systems LLC Copyright 2019 Figure 3 OSD3358 SM RED Ethernet PHY Layout Example...

Страница 10: ...mend that you focus on careful placement and routing of a single Ethernet PHY and port Once that Ethernet PHY and port are placed and routed to your satisfaction the layout can be replicated easily fo...

Страница 11: ...10 Using Ethernet with OSD335x AM335x System in Package Rev 1 2 18 2019 Octavo Systems LLC Copyright 2019 Figure 5 Dual Ethernet Power Layer Example...

Страница 12: ...Family of devices osd335x sm dtsi and osd335x csip dtsi which can be found at https github com octavosystems OSD335x Device Tree In the main device tree file for your board you will need to 1 Define t...

Страница 13: ...with OSD335x AM335x System in Package Rev 1 2 18 2019 Octavo Systems LLC Copyright 2019 Figure 6 OSD3358 SM RED Pin Mux Example Ethernet MAC 1 as RGMII Interface Figure 7 OSD3358 SM RED Pin Mux Examp...

Страница 14: ...io phandle as shown in Figure 9 Figure 9 OSD3358 SM RED s davinci_mdio phandle example 4 Set PHY ID As discussed above each Ethernet PHY has a specific PHY address that is set in hardware using pull u...

Страница 15: ...lin com linux latest source Documentation devicetree bindings n et ethernet txt as shown in Figure 10 Figure 10 PHY ID and PHY Mode Figure 11 PHY_ADDR 2 0 0x04 for Eth PHY 6 Additional Properties for...

Страница 16: ..._id This could be a typo in the device tree or improper detection of the PHY address based on the pull up pull down resistors on the PHY configuration pins In this error message the Ethernet PHY phy_i...

Страница 17: ...there are bad packets on the network 2 Use an oscilloscope to view Ethernet signals Unfortunately a higher end oscilloscope is required to view the PHY to RJ45 Port connections However lower cost osc...

Страница 18: ...17 Using Ethernet with OSD335x AM335x System in Package Rev 1 2 18 2019 Octavo Systems LLC Copyright 2019...

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