Questions tagged [rmii]

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Integrating an ethernet switch IC to custom pcb with mcu using RMII

I have a custom board with LPC1768. It has also PHY (LAN8720) in order to connect to LAN via RJ45. So far so good. Now, I have ...
2
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1answer
81 views

Ethernet RMII using ribbon cable

I am trying to interface the Ethenet using RMII at 100 Mbps speed. The main board is a RH850 F1 evaluation board. Ethernet RMII transciever is a DP83848 chip on a waveshare External Transciever Board ...
2
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1answer
121 views

How do I interpret the setup/hold time on this RMII interface?

I'm coding the FPGA (MAC) side of an RMII interface between an Altera FPGA and LAN8720 device. Page 72 of the datsheet (pdf) shows the relevant timing diagram for this interface. The input setup/hold ...
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2answers
205 views

How to connect the PHY crystal for RMII?

I'm attempting to implement Ethernet communication for the first time and have run into an issue with my PHY. I'm using the KSZ8091RNBCA. According to the datasheet, when running in RMII mode, the XO ...
1
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3answers
486 views

Connecting KSZ8863RLL to a MAC using RMII

(Edited to ask further question about the MDIO/MDC pins.) I'm adding a Lantronix xPico 250 to an embedded deivce to provide WiFi access. The device has an ARM based SOM which includes a PHY and there ...
2
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2answers
470 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 ...
9
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2answers
2k views

Ethernet RMII on two layer PCB

INTRODUCTION: I'm aiming to design an Ethernet connected system as a hobby ( ie. plenty of time but not wishing to spend much ). My design constraints would ideally be sticking to a 2 layer 100mm x ...
5
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2answers
7k views

RGMII and RMII backwards compatibility

According to Wikipedia: GMII [...] is backwards compatible with the media-independent interface (MII) But is RGMII backwards compatible with RMII? I'm asking this because I'm making a schematic ...
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2answers
107 views

How to convert RMII signals to LVPECL signals

As far as I understand the RMII output signal of an ethernet PHY is a TTL signal (at least according to wikipedia). I need to convert these into LVPECL signals. So on the one side I have something ...
5
votes
1answer
3k 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 ...