Questions tagged [rmii]

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1answer
70 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 ...
0
votes
1answer
148 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
vote
3answers
372 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
votes
1answer
330 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
votes
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
votes
2answers
6k 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 ...
1
vote
2answers
104 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 ...