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Questions tagged [mii]

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1 vote
1 answer
528 views

How should I connect two MII devices back to back?

I have researched a bit on this topic. Each time I found different opinions and examples. Earlier, I've made a successful connection between a RMII featured micro-chip and an ethernet PHY, again RMII ...
Sener's user avatar
  • 273
0 votes
1 answer
133 views

MII inpedance matching for LAN9313i

I am designing an ethernet switch using the LAN9313i and the ADIN1100. For my understanding MII traces should be routed to match 50 Ω. However, Microchip recommends 68 Ω in their routing checklist and ...
Paul Mustermann's user avatar
3 votes
2 answers
591 views

Media Independent Interface signals

For the MII interface signals, I read on Wikipedia - MII on the Tx and Rx signals. But I am confused about why there are two clocks (for Tx and Rx)? Are the directions mentioned for transmitter ...
user avatar
0 votes
0 answers
107 views

Using an Ethernet Phy and XFMR instead of RS422

We've been using a quad RS485 setup for some time. No problems. Now we'd like to increase the speed over what we can get away with on RS485 with the micro we're using. Essentially, we've been ...
GaryLa's user avatar
  • 15
1 vote
0 answers
82 views

MII/GMII switch for 10/100 Mbps vs 1Gbps

The lack of search results I've got so far suggests that I have a fundamental misconception here, but: for a PHY with a MII/GMII interface such as the KSZ9031MNX, how does the MAC decide whether to ...
Simon Richter's user avatar
1 vote
1 answer
183 views

Ethernet Phy Rx developed in a FPGA to send data to an ethernet Mac

I'm trying to send data from a FPGA to the Ethernet Mac port of a SoC which has the stmmac Synopsys IP. I'm using the MII protocol at 25MHz for 100Mb/s (4-bit per clock cycle). I'm sending the ...
gregoiregentil's user avatar
0 votes
1 answer
873 views

How to connect two Ethernet switch ICs together using MII Interface

I have been searching on how to connect two Ethernet switch ICs together. I have designed a custom PCB. Beside some other features, it accommodates an Ethernet Switch IC. This works OK. The bandwidth ...
Sener's user avatar
  • 273
1 vote
1 answer
4k views

MDIO bus pull-ups

What is the proper way to connect multiple ethernet devices via MDIO bus? I know that MDIO (similarly to I2C) is open drain, so I think that I need (just as in I2C) two 1-4, 7 kOhm pull-ups both for ...
Andy's user avatar
  • 355
4 votes
2 answers
2k views

Embedded Ethernet Solution w/ PoE+; SPI or MII?

I am currently undertaking my first hardware design attempt of an embedded Ethernet project w/ PoE+. I have experience working with embedded systems with Ethernet (mostly ARM M3/M4 processors with ...
zme's user avatar
  • 337
0 votes
1 answer
689 views

Using SMI to check speed of ethernet phy

I am trying to use the ethernet PHY which comes with my Digilent Nexus 4 DDR, a Microchip LAN8720A (datasheet). I wrote a controller which lets me read and write values to the smi registers using the ...
chasep255's user avatar
  • 523
0 votes
1 answer
2k views

Ethernet MII Timings MAC<->PHY

I am a student working on my graduation project, which will need an Ethernet interface. For such job I choose a microcontroller with built in MAC (STM32F777BIT) and for the PHY, the LAN 8740. I have ...
Pedro Santos's user avatar
1 vote
2 answers
2k views

Lan9500 to Switch (KSZ8795) MII wiring

I'm an experienced analog/power designer that's been asked by a coworker to scrub a digital design. He's pretty junior, but a good friend, so I am helping. (So now we're BOTH in trouble. ;-P We ...
EforDogsFan's user avatar
4 votes
1 answer
3k views

Ethernet Transmission with one MAC and Multiple PHYs

I have been recently learning about ethernet subsystem. I see that the MDIO interface is shared across multiple (upto 32) PHYs from a single MAC and each PHY's state can be accessed using the 5-bit ...
gmancity's user avatar
0 votes
1 answer
2k views

Reverse MII and TXER, RXER pins

I've got two ethernet ICs that should be put back to back with reverse MII mode. For this, I should cross the TX and RX pins and the application note of the reverse MII chip says, the TXER and RXER ...
martin's user avatar
  • 225
0 votes
1 answer
842 views

Does SGMII contain MDIO?

When connecting a NIC (Intel I210-IS) to an gigabit ethernet switch with integrated PHYs (Marvell 88E6176) using the SGMII interface, I came across the following question: Since SGMII is a serialized ...
Simon's user avatar
  • 695
7 votes
1 answer
4k views

Can an RMII phy be connected directly to another RMII phy

I have some Microchip (SMSC) LAN9303 Ethernet switches in my system. The LAN9303 is a 3-port switch which has 2 connections for twisted pair cables and one MII connection. The switch chips are some ...
Will's user avatar
  • 488