Hi,
I wanted to test ethernet on my vocore without the dock.
I cut a ethernet cable and connected it to the vocore.
This is how i connected it.
wire 1 (White/orange) -- p4TP
wire 2 (Orange) -- p4TN
Wire3 (white/green) -- p4RP
wire6 (green) -- P4RN
Is that no enough or do i need to enable it somewhere else?
Ethernet connection with straightthrough
- Diabolus
- Posts: 1
- Joined: Sat Nov 15, 2014 11:58 pm
- Pyrofer
- Posts: 61
- Joined: Tue Oct 21, 2014 11:35 am
Re: Ethernet connection with straightthrough
You need Ethernet magnetics and a 1.8v pin on the centertap.
Look on RS/Digikey/Mouser/Farnell etc for an RJ45 with integrated magnetics. There will be 3 pins for Rx and TX. Each centertap pin goes to 1.8v then it all works. Without that you get nowhere.
Look on RS/Digikey/Mouser/Farnell etc for an RJ45 with integrated magnetics. There will be 3 pins for Rx and TX. Each centertap pin goes to 1.8v then it all works. Without that you get nowhere.
- Peter
- Posts: 14
- Joined: Sat Dec 06, 2014 6:00 am
Re: Ethernet connection with straightthrough
What kind of minimum circuitry would I need for a PCB to PCB ethernet cable? (ca. 5cm in length)
I tried to wire it directly but no link is detected.
I tried to wire it directly but no link is detected.
- Peter H
- Posts: 58
- Joined: Wed Nov 12, 2014 10:24 pm
Re: Ethernet connection with straightthrough
Do you definitely need Ethernet? It would be very easy to make a serial connection at that distance.
- Pyrofer
- Posts: 61
- Joined: Tue Oct 21, 2014 11:35 am
Re: Ethernet connection with straightthrough
As I said, if you want Ethernet then you need the magnetics with 1.8v on the center tap.
You can buy "magjack" RJ45 ports with the magnetics built in which is what I have used on all of my VoCore boards.
You can buy "magjack" RJ45 ports with the magnetics built in which is what I have used on all of my VoCore boards.
- Peter
- Posts: 14
- Joined: Sat Dec 06, 2014 6:00 am
Re: Ethernet connection with straightthrough
Did anybody successfully connected to ethernet without magneticks/rj45 jack yet?
(which should be possible - see TI application note www.ti.com/lit/an/snla088a/snla088a.pdf )
(which should be possible - see TI application note www.ti.com/lit/an/snla088a/snla088a.pdf )
- Greenwire-Elektronik
- Posts: 101
- Joined: Thu Dec 04, 2014 6:31 am
Re: Ethernet connection with straightthrough
Peter - this app note is only applicable for TI products - you really should think about using magnetics - at least for ground compensation current which could damage your circuit.
- Ruphobia
- Posts: 18
- Joined: Fri Jan 30, 2015 4:07 pm
Re: Ethernet connection with straightthrough
I've wondered about doing this for years with various little Ethernet boards; This would be great for daisy chaining or cluster computing back plane, small robots, etc. Did you ever make this work?
- SteeevO
- Posts: 4
- Joined: Wed Aug 26, 2015 5:09 pm
Re: Ethernet connection with straightthrough
I've also been having this same problem.
I didn't realize that more components were required.
I didn't realize that more components were required.
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