Questions tagged [rmii]
The rmii tag has no usage guidance.
25
questions
4
votes
2
answers
129
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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 ...
- 113
1
vote
1
answer
45
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-...
- 78.1k
0
votes
0
answers
27
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Ethernet MAC TO MAC Communication between S32K148_SAMA5D27 Schematic Review
I am doing RMII MAC TO MAC Communication between S32K and SAMA5D27.Please find the attached
schematic file. Could you please review it.
May I know the level shifters directions are correct or not. My ...
- 1,804
0
votes
0
answers
135
views
DP83848 doesn't appear in STM32CubeIDE
I am studying the RMII protocol with Ethernet connection on STM32H753ZIT6. I am using the STM32CubeIDE for the configuration but there is a problem: In "LWIP" -> "Platform Settings&...
- 1
0
votes
1
answer
117
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RMII to USB conversion IC [closed]
May I know any IC exists for converting USB Type C to RMII. The intention is to communicate between SOM module and micro-controller.
SOM support USB type C and RMII is present in micro-controller.
- 1,804
1
vote
2
answers
176
views
RMII interface name length matching?
I'm drawing the layout for an RMII interface, but I have two doubts:
1 - Do RMII interface traces need length matching?
2 - Do the traces of the RMII interface have to be impedance controlled?
I ask ...
- 778
2
votes
1
answer
147
views
Ethernet communication on the same board : do I need a transformer? [duplicate]
I need to communicate between a microcontroller that has an integrated MAC (Datasheet) and a microprocessor that has an integrated MAC and PHY (Datasheet). The pins of the MAC on the processor are ...
- 103
0
votes
0
answers
190
views
Connecting two ethernet ports back to back
Suppose, I am connecting the copper ports of 2 PHYs in back-to-back mode in the same board (using capacitive coupling technique), should the TX pair of one PHY be connected to the Rx pair of the other ...
user220456
0
votes
2
answers
1k
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. ...
0
votes
1
answer
412
views
RX_ER peripheral not used in RMII
I'm using this PHY and MAC in this Controller
The Controller does not have the ENET_RX_ER peripherals in the 100 pin package.
In that case, can we handle the RX_ER in RMII interface using a GPIO port ...
user220456
0
votes
2
answers
109
views
Interfacing RJ45 to 3 pin RMII and bidirectionality
I am trying to add an Ethernet interface to a dev board (This board specifically).
From looking at the schematics, I see that it has a 3 pin PHY input (GND, TRX+, and TRX-). From my understanding, a ...
- 93
4
votes
1
answer
168
views
Is safe to route a rmii (txd0 txd1) track under resistors?
I'm creating a PCB to connect an ESP32 to a PHY (lan8720) and I want do route a trace under some resistors. Is there any problem (crosstalk) doing this? The trace is txd0 (txd- on picture) under the ...
- 41
1
vote
1
answer
600
views
Crystal Oscillator for STM32F407 with LAN8720
I'm planning to build a custom board with STM32F407 chip for a system where I also need Ethernet connectivity.
I'm planning to connect this board to a LAN8720 with breakout board from Smart ...
- 189
0
votes
1
answer
276
views
What is the setup/hold time of the RMII receive interface of the TI DP83630 phy chip?
I'm interfacing the TI DP83630 phy chip to FPGA over RMII interface and need to write the timing constraints. I'm having difficulties interpreting the receive interface setup and hold time from the ...
1
vote
1
answer
167
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 ...
- 661
0
votes
0
answers
335
views
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 ...
- 231
2
votes
1
answer
694
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 ...
- 121
2
votes
1
answer
649
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 ...
- 5,372
0
votes
2
answers
842
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 ...
- 113
1
vote
3
answers
1k
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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 ...
- 21
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 ...
- 327
12
votes
2
answers
6k
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 ...
6
votes
2
answers
12k
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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 ...
- 622
1
vote
2
answers
154
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 ...
- 11
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 ...
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