Ethernet support for other devices

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JohnRed
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Ethernet support for other devices

Postby JohnRed » Mon Nov 23, 2020 11:53 am

I want to reduce the cost and size of my design that uses the XE216 XMOS device, it includes an Ethernet link using the Micrel KSZ09031RNZ from the Ethernet slice board. For me this has the disadvantage that it requires a physically big solution footprint needing two power supplies and supports a 1GB link. I only need to support a 100MB link and have found the Texas Instruments DP83826IRHB which from a single supply supports a 100MBPS link and costs considerably less.

My question is, how can I be sure that the XMOS ethernet.lib will support the new device?
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mon2
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Postby mon2 » Mon Nov 23, 2020 1:24 pm

Hi. Consider to use the LAN8710A which was used by XMOS on their 100MBS Ethernet slice board (now EOL). With this solution, you can use the proven to work IP.

Otherwise, you can study the same reference design to see how you can modify to support for your device.

The LAN8710A is under $1 usd.

Power supplies are relatively low cost and the AR8035 (gigabit) is available in volume from Arrow, etc for also $1USD or less.

Recommend highly to work with a known good ethernet controller with a reference IP.

These days we are deploying the XDFN 300-500 mA ldo from ONSEMI which are about $0.05USD or less in tape and reel qty.
JohnRed
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Postby JohnRed » Mon Nov 23, 2020 4:35 pm

Thanks for that suggestion, LAN8710A-EZC does look OK.
Could you help by sending me a link to the slice evaluation board and the cad files for the board so I can ensure the board matches the requirement of the libraries and IP?

Thanks

John
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mon2
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Postby mon2 » Mon Nov 23, 2020 5:36 pm

https://www.xmos.ai/file/xa-sk-eth100-s ... mentation/

https://www.xmos.ai/download/AN00120:-X ... .2rc1).pdf

Review AN00120 here:
https://www.xmos.ai/application-notes/

Slicekit details:
https://www.xmos.ai/?s=slicekit

The schematic for this older slice board appears to be in the witness protection program on the new website but found it on our local drive - see attached.
XA-SK-E100-SCH.pdf
If there is an interest, the RJ45 with magnetics was reviewed a while again - recommend that you build locally with Pulse, then consider offshore clones like Link-PP (Shenzhen) or Trxcom INT'L Technology Co. Limited.

Can help if you need it.
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Redeye
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Postby Redeye » Mon Nov 23, 2020 8:53 pm

We've successfully used the LAN8710A for a long time for 100Mbps ethernet. If you're doing a new design it's probably wise to consider using the LAN8740A which is hardware and software compatible, but a newer version (I suspect the LAN8710A will eventually be phased out). We've used these parts interchangably with no issues.
ozel
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Postby ozel » Mon Nov 30, 2020 9:32 pm

mon2 wrote:
Mon Nov 23, 2020 5:36 pm
witness protection program
:D good one!
the website is truly approaching a worrying state
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akp
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Postby akp » Tue Dec 01, 2020 2:38 pm

My feeling is there are some very big fish to fry and we minnows may not be worth much attention...

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