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How to test Ethernet PHY's MDI interface through JTAG Boundary scan

We now use SCANWORKS Boundary Scan Tool from ASSET to make Ethernet SWITCH's manufacturing test. But in almost all PHY chips from broadcom corp, the MDI interfaces are "Linkage" bits. It means that ...
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44 views

Ethernet PHY Device read and write operation is not working

I am trying to Read and write the DM9161A PHY MII-register through EMAC ATSAM3x8e. ...
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1answer
51 views

Switching between two Ethernet magnetics and one simple Phy

I'm deep into a project and I would like to ask how can I switch 2 ethernet interfaces to single PHY. I know that there're some suitable analog switches for this purpose like MAX4890, but I don't ...
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1answer
66 views

Ethernet components location

The normal ethernet components configuration: MAC <-> PHY <-> Magnetics <-> RJ45. My RJ45 connector must be mounted on the system box's front panel, so there must be a wire routed from the ...
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2answers
360 views

how to implement Ethernet with PIC, PIC18F97J60, PIC32MX(795F512L), ENC624J600, LAN8720A

My project is a data logger board which must mount a PIC of some kind to provide USB and Ethernet as a means to communicating with the board. I can develop this system into two products a low-end ...
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141 views

PHY device not responding to MDIO

Update: I have read more about this and what I can conclude is that the phy IC is not initialized correctly. Still no able to figure out how to initialize phy device. Please go through the code and ...
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2answers
539 views

What is the exact difference between SGMII and 1000Base-X?

I was wondering what the exact difference between SGMII and 1000Base-X is, because both seem very similar. Is the "big" difference only the physical medium they are supposed to be transmitted on? Both ...
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1answer
103 views

Termination resistors in Ethernet in Kilo-Ohms instead of Ohms?

When working with Ethernet, whether copper or optical fiber, why are the termination resistors always in a few ohms and never in kilo-ohms? Example: 49.9R on transmit & receive pair of PHY in ...
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1answer
404 views

RMII MAC side routing and signal integrity

I have some signal integrity and EMC questions. In my board LPC1768 RMII interface is connected to LAN8720. Because of pin locations some RMII signals must go through bottom layer. This is a four ...
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0answers
104 views

Wake On LAN to PMIC

I'm a connecting a WOL interrupt port of the PHY (an open drain port) to the ON-OFF port of the PMIC of my device. The idea is do a reset of the PMIC and then I'm going to turn on the MCU from a ...
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2answers
284 views

Problem with Ethernet PHY

One of my clients is experiencing problems with a SMSC LAN8710A PHY that is connected to a Xilinx FPGA. The Ethernet link works perfectly when the board is connected to my MacBook or to my office ...
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2answers
299 views

Vitesse VSC8221 Ethernet PHY for Media Converter Application

I'm currently designing a media converter board using Vitesse VSC8221. Just as an FYI, the documents for this product are all available at the product page. No NDA is required. When I say media ...
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2answers
796 views

Media Independent Interface (MII) vs Media Dependent Interface (MDI)

Is my understanding about Ethernet - MII & MDI correct? MII - Media Independent Interface is about the connectivity between MAC and PHY. In other words, it is about TXD and RXD signals from MAC ...
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1answer
317 views

What ferrite for Ethernet Phy?

I'm using a Micrel KSZ8051 Phy in a 100mbps design. The datasheet specifies that it should have a small ferrite bead feeding the power. However, the datasheet doesn't suggest any specifications for ...
2
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2answers
461 views

KSZ8863RLL and external PHY (KSZ8051RNL)

I'm designing an Ethernet switch with KSZ8863RLL. It's a 3-way switch but only has 2 integrated PHYs and for the 3rd port it has an RMII interface. Datasheet says that the 3rd port can work in 'MII ...
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0answers
85 views

PHYs, Protocol Stacks and MACs, where can I find a simple good tutorial that uses a simple protocol to teach these concepts

With modern communication standards like USB, Ethernet, PCIe there is a lot of complexity involved as data is recieved/transmitted. I want to understand the concepts of PHY; Protocol Stack that ...
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2answers
140 views

An ethernet PHY chip speed support

I found ENC28J60 Ethernet PHY chip. The specifications say that the Physical Network Type is '10BASE-T' on the one hand, but on the other hand the data rate is ...
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2answers
261 views

Why is AC coupling needed between PHY and Fiber transceiver?

I'm using the DP83620 with the AFBR-5803 Avago transceiver. This question is not specific to these parts, but I'm including them for the sake of clarity. The datasheets for both devices indicates ...
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3answers
1k views

Schematic Critique: Phy interface with RJ45/Magnetics

I'm working on my first major schematic design and would really appreciate some feedback on the analog side of the 1000BASE-T Ethernet interface. I'm mostly concerned about the analog line termination ...
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1answer
699 views

RC pulldown on the MDI lines between the ethernet PHY and RJ45 Connector

I came across this circuit as part of the Xilinx Spartan 6 601 evaluation kit board diagram: Left hand IC is an 88E1111 (incidentally, the datasheet of which is incredibly difficult to obtain), the ...
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1answer
204 views

Datasheet: What is a unit interval (UI) for a PMA?

This datasheet has a table (see Table 3-2) detailing latencies for the two parts of a 10GB Ethernet PHY, namely the PCS (Physical Coding Sublayer) and PMA (Physical Medium Attachment Sublayer). While ...
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3answers
1k views

Do all PHY Ethernet chips have a hard-coded MAC address?

For example, this TI PHY chip DP83630 has two MAC addresses that can be used as destination and source MAC addresses for PHY control frames. (page 72 and 94) Does this means all PHY chips will have ...
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2answers
2k views

Ethernet 100 ohm differential pair layout

I'm finishing off the layout of a board in Eagle which has a LAN8710A 100Mbps Ethernet PHY on it. The SMSC documentation is really pretty good but I'm stuck on the important detail of how to do the ...
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2answers
244 views

Is there any restriction in the choice of Ethernet PHY, depending on the TCP/IP stack?

I am new on the forum and am currently working on a project to design an ethernet electronic board. I will have a microcontroller 32-bit with an external PHY. I wanted to know : depending on the ...
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1answer
476 views

USB “Serial” Transceivers (PHY)

I am currently trying to incorporate a Freescale i.mx53 into a design. It has three USB High Speed hosts; one has a built in transceiver, the other two do not (OTG is not part of this discussion). ...
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1answer
799 views

DP83848 (Ethernet PHY) 1-bit serial receive data in 10Base-T

Having trouble getting a National Semi DP83848J working in 10BASE-T mode. The link partner and local status register agree that the link is in 10Mbps full-duplex mode. However, instead of receiving ...
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3answers
7k views

Connection of center tap for Ethernet transformer

I'm trying to connect an RJ-45 jack with integrated magnetics (Belfuse L829-1X1T-91 datasheet) to an Ethernet PHY chip (Micrel KSZ8041TL datasheet). The TX+/-, RX+/-, and the LED pins are all easy ...