Newest 'phy+ethernet' Questions

0 votes

0 answers

67 views

What is the difference between the PHY sublayers PCS, PMA and PMD?

I'm reading Analog Device's Beginner's Guide to Ethernet. It's really good and goes into concepts like Manchester Encoding, 4B/5B, NRZT, MLT3 which seem to make sense to me. However, it kind of ...

Izzo

2,086

asked Nov 2 at 13:36

0 votes

1 answer

65 views

KSZ8081RNA PHY Design

I am designing a circuit using the KSZ8081RNAIA Ethernet PHY, and I have a question regarding the use of pin 23 (LED pin). The datasheet can be found here. As I understand it, pin 23 is a strap-in pin ...

HV16

377

asked Oct 15 at 13:41

1 vote

2 answers

129 views

Ethernet 1G Magnetic swap is possible?

I have the following circuit with Ethernet switch that connect to quad magnetic, my layout engineer required me to swap for easier layout. Pay attention - the swap will be only in the magnetic side, ...

Knowledge

471

asked Sep 25 at 17:09

3 votes

2 answers

919 views

What does it mean to write to the Register of an IC?

I am interested in using DP83TD510E as an ethernet PHY (side note, it seems to be one of the only ones I can find that supports 10Base-T-10L) and don't understand how it could be "programmed"...

Ailsa Sun

31

asked Aug 5 at 6:57

1 vote

1 answer

138 views

Connecting two W5500 via UDP results in PHY link off

I want to connect two STM32F4 and to communicate via UDP. At the moment I only want to send data from one to another mcu. I have tested tx and rx communication separately with PC - python scripts and ...

macola995

109

asked May 14 at 16:27

1 vote

1 answer

252 views

How can I configure RealTek RTL8211F for 100Base-T?

Introduction I'm planning to use RealTek RTL8211F Ethernet PHY. I have an example schematic. Problem The problem here is that the RJ45 Ethernet connector 48F-01GYDXNL is very difficult to get and I'm ...

euraad

1,388

asked Apr 5 at 7:58

1 vote

1 answer

228 views

LAN8720 MDC (SMI Clock) and/or ringing issue

I had always difficult times with designs having LAN8720 device on it. It behaves differently with each design (this is understandable and even I carefully design it according to the design ...

Sener

283

asked Feb 6 at 10:59

1 vote

1 answer

247 views

Ethernet PHY design query: Compatibility of DP83848QSQ/NOPB with STM32F407VET6 and pin configuration concerns

I'm relatively new to Ethernet PHY design and currently working on a project where I've chosen the DP83848QSQ/NOPB PHY and plan to connect it to the STM32F407VET6 microcontroller. However, I've ...

user362241

asked Jan 31 at 6:20

1 vote

1 answer

316 views

LAN8720A - PoE Protection

I will go straight to my question. I have currently a PoE PD using LAN8720A PHY, i follow almost all manufacturer recommendations on PCB layout and schematics, anyways i have dead LAN8720A straight ...

Radu G.

23

asked Dec 6, 2023 at 12:43

0 votes

2 answers

219 views

Do we need differential routing TX and RX in Ethernet RMII MAC to MAC Connection

I am implementing an Ethernet mac to mac connection between SAMA5D27C-D1G-CU and FS32K148UJT0VLQT micro-controller. In MAC to MAC communication PHY TX is connected to RX of MAC and vice versa as shown ...

Confused

3,061

asked Dec 5, 2023 at 14:53

0 votes

2 answers

119 views

Ethernet switch

I'm designing a PCB and it requires me to receive three Ethernet ports, and output one of them to the forth port. Then it goes from Ethernet to a USB converter, and goes to the system. My question is, ...

Dima Balyasny

1

asked Nov 14, 2023 at 17:18

1 vote

2 answers

470 views

Ethernet Magnetics Polarity Swapping

Can I on the same pair (for Example A) to swap polarity on opposite side of transformer/magnetics? Update 1: Currently i use cross-over method to make lanes shorted and more easy to layout. Update 2:...

Radu G.

23

asked Oct 27, 2023 at 7:28

0 votes

1 answer

184 views

Termination of unused MDI pairs

I'm muxing Ethernet MDI between two PHYs – one of which is 10/100 (2-pair) and the other of which is 1+Gbps (4-pair). A single set of magnetics (4-pair) serves both PHYs via the mux. Does anybody have ...

foxtrot

167

asked Oct 14, 2023 at 19:51

-1 votes

1 answer

383 views

How to define PHY mode and MAC mode between back to back switches

I'm planning to use this Switch IC connected to another another switch ic which is the same part number. When connecting these devices in back to back mode with RGMII interface between then, I need to ...

Freshman

945

asked Oct 13, 2023 at 18:33

4 votes

2 answers

247 views

Ethernet PHY - colliding with itself?

I have an embedded system, that whenever the PHY transmits on the twisted pair, the connected hub indicates a collision, and I see nothing on Wireshark. I am 100% confident it is not a software ...

Shaken_U

183

asked Sep 14, 2023 at 19:33

1 vote

1 answer

133 views

Connecting two ethernet PHY's (KSZ8051RNLU) in RMII back toback configuration

I would like to to connect the KSZ8051RNLU in a loopback configuration with itself, I have read that this is possible with other PHY's. Does the KSZ8051RNLU have this capability? Will it auto-...

Voltage Spike♦

88.8k

asked Aug 4, 2023 at 21:34

0 votes

1 answer

81 views

Inductor without inductance

I am trying to find the right component for this inductor. It doesn't show inductance which is bit confusing for me. Which part should I pick for this if I wanted to use it on my PCB? it's from NUCLEO-...

Arkadiusz Rycyk

13

asked Jun 19, 2023 at 14:25

0 votes

0 answers

143 views

Connection between MCUs with PHY peripherals

I plan to use a MAC TO MAC communication. RMII is decided to be used. One processor is SAMA5D27 and the other is S32K148. The signal connections seems to be OK. But would this configuration work? Also ...

Freshman

945

asked Jun 16, 2023 at 6:50

1 vote

1 answer

94 views

PHY 100MBit Link Problem (LAN8814)

We integrated a LAN switch into our design to be able to daisy chain devices and to use PTP. The switch (a LAN9668) has 2 internal CuPhy that we use. It is controlled using an SPI interface and does ...

Gunther

121

asked Jun 15, 2023 at 6:27

1 vote

0 answers

188 views

LAN8742a autonegotiation gives a half-duplex mode result when it's espected to be full-duplex mode result

I was testing an ethernet based project PCB that uses LAN8742a xip (lan xip seller link) and a stm32f207zg microcontroller (mcu seller link). We are having some issues when we increase the stress ...

Suvi_Eu

871

asked Jun 14, 2023 at 15:01

0 votes

2 answers

542 views

PHY address for SPI interface

I'm currently working on a project of a testing module that requires three Ethernet ports: one for network connection two for external hardware (one of which is a device being tested) The testing ...

Johan Larsson

11

asked Feb 9, 2023 at 7:24

2 votes

0 answers

177 views

ESD problem and how to solve

We have a problem with contact discharge of 3kV on a housing part. The PCB with the PHY are installed in an aluminum lower part with plastic upper part (dimensions approx. 80x80x80mm). The contact ...

user220456

asked Jan 30, 2023 at 9:53

0 votes

1 answer

50 views

Merging of Ethernet copper ports into 1

I have configured the copper ports of Ethernet switch as shown below. (i.e merged all the ports and made it has a single port). My understanding is there will be a signal overlap during the Auto-neg ...

user220456

asked Jan 11, 2023 at 10:08

1 vote

1 answer

381 views

MAC to MAC connection TX to RX [duplicate]

I'm connecting two MACs back to back. One is the IMX6 processor. The other device is this Microchip LAN9370 "5-Port AVB/TSN Gigabit Ethernet Switch with Integrated 100BASE-T1 PHYs". In that ...

user220456

asked Dec 16, 2022 at 13:58

16 votes

2 answers

4k views

Why are Ethernet MAC and PHY separate?

I’ve been looking for a MCU/MPU with built-in Ethernet connectivity, and I’ve noticed that most only contain a built-in Ethernet MAC interface and require an external PHY. Why is this the case, as in ...

cdubs

425

asked Dec 15, 2022 at 23:54

0 votes

1 answer

613 views

How to build multiport Ethernet switch? [closed]

I have been researching how to build managed/multiport Ethernet switch. There are things that I do not understand and would like to know more. Some Ethernet switches have built in MACs and if I use ...

OnurTR

177

asked Dec 14, 2022 at 11:09

0 votes

1 answer

92 views

How to generate an interrupt on this pin?

In this device, I'm using an internal PHY mode and this pin nPHY_INT is an active-low interrupt output (wrongly mentioned in the datasheet as active-high). I just want to understand how to generate an ...

user220456

asked Nov 2, 2022 at 9:00

4 votes

2 answers

510 views

Adding an extra magnetics transformer for 100Base-T Ethernet

For variuous reasons I need to add an extra transformer between external ethernet connection and an ethernet device that has magnetics built in. The reason being, among others, to elimnate possible ...

tarmogr

181

asked Oct 23, 2022 at 16:04

0 votes

1 answer

34 views

Configuration of the Interrupt Signal

I'm using this IC- LAN9500A and want to know how to use pin 1, nPHY_INT. I'm using internal PHY and want to generate output on this pin 1 (interrupt output) Can someone tell me how to configure it? Is ...

user220456

asked Oct 21, 2022 at 11:13

1 vote

1 answer

83 views

Meaning of Phase Angle

In this Application Note, section 3.1, Can someone help me to understand the meaning of "magnitude of phase angle of the load" in simple terms? Phase angle between Rx and Tx or what does ...

user220456

asked Oct 14, 2022 at 9:51

2 votes

1 answer

392 views

Can SGMII MAC communicate with 100BASE PHY at 1 Gb/s?

In the DP83TC811S-Q1 SGMII's datasheet it says Because the DP83TC811S-Q1 operates at 100 Mbps, the 1.25 Gbps rate of the SGMII is excessive. The SGMII specification allows for 100 Mbps operation by ...

qand

57

asked Oct 5, 2022 at 10:38

2 votes

2 answers

1k views

Using an Ethernet gigabit PHY for only 100 and 10 Mbps speeds

I am designing a custom board. I have a USB to Ethernet converter which has 10/100 PHY and I want to connect that PHY to the gigabit Ethernet PHY. I have researched about that problem and found a ...

vision34

31

asked Sep 27, 2022 at 13:47

1 vote

1 answer

175 views

Linking WiFi MCU to Ethernet PHY via PCIe

I'm trying to link this Ethernet PHY to this WiFi 6 MCU via PCIe to make a single port router. Can I directly connect these two, or do I need some kind of host CPU with two PCIe slots to link them? ...

cdubs

425

asked Sep 19, 2022 at 21:54

0 votes

2 answers

3k views

How to use Gigabit Ethernet with MCU?

I am new at ethernet and it comes complex. Trying to use STM32's RMII interface with switch. I just want to see at IT's switch gigabit port. I don't want to transfer data gigabit, it doesn't matter. ...

hasanyucelcogal

1

asked Sep 8, 2022 at 13:56

0 votes

1 answer

51 views

Using ethernet PHY building blocks PAM/PCS

This is a more theoretical question. Is it possible to use internal building blocks of an Ethernet PHY directly and without typical Ethernet framing? I am looking for a way to have access to the ...

ARi

1

asked Sep 1, 2022 at 15:53

2 votes

2 answers

1k views

Ethernet devices polarity reversal support

Does all Ethernet PHY devices support polarity reversal even if its not mentioned in the datasheet? [I mean polarity reversal by swapping TX+ with TX- (Like connecting TX+ to RX- or TX- to RX+). Is ...

user220456

asked Aug 25, 2022 at 9:23

1 vote

1 answer

3k views

Ethernet with STM32

I designed an ethernet microchip with reference (LAN8742A-LAN8742) with MCU STM32F767ZGT6, so I followed some document routing ethernet in PCB I respect all rules. when I put the ethernet there is a ...

PCB-ABBS

176

asked Aug 15, 2022 at 8:07

5 votes

1 answer

2k views

Connecting a PHY to another PHY on a same board

I would like to connect voltage-mode PHYs with internal terminations back-to-back. After doing some research, it looks like simple AC coupling caps can work, but it's better to use a transformer, ...

jp28212821

51

asked Aug 14, 2022 at 6:16

0 votes

0 answers

55 views

Additional processor needed for WiFi-MCU module?

I'm reading up on the design of WiFi-to-Ethernet converters, and came across the Ubiquiti U6-LR Teardown. I noticed that both this device and its competitors have not just a WiFi-enabled MCU and PHY, ...

cdubs

425

asked May 18, 2022 at 2:59

0 votes

1 answer

50 views

Meaning of Speed and Duplex pin in the IC

In this - Link of the datasheet, can someone tell me what is the meaning/purpose of the DUPLEX Pin and the SPEED pin. Unable to understand what it actually does and what does it indicate?

user220456

asked May 17, 2022 at 3:57

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