As you can see on section 12.5 of the Datasheet: I210 Datasheet . The i210-AT/IT should be used with either discrete or integrated magnetics as they impact the compliance with IEEE standards.
Read carefully chapter 12 Design Considerations of the datasheet before implementing your solution; specially sections 12.5 Ethernet Interface, and 12.7 Power Supplies.
If you need to implement a transformerless solution you could use the i210-AS/IS as a MAC and connect it to a transformerless external PHY module using the SGMII/SERDES interface.
Here is the Reference Design Schematic for both technologies:
This link might also be useful to you: http://www.intel.com/content/www/us/en/embedded/products/networking/ethernet-controller-i210-i211-faq.html
Hello Adolfo and community,
I received some information from intel support:
There is an application note "480093" on transformerless ethernet, featuring also the i210.
I am note sure if I may post the link here.
Also, intel support stated the following:
"For the magnetic-less design, for I210 we recommend to use "0.47uF" for the capacitor value.
The capacitor placement is arbitrary, but the capacitor value is critical to the success of the design. See Table 1 for recommended starting values. Deviation from these values may be necessary. In some cases, the value of the capacitor will need to change due to vendor and device PHY performance variation.
It is recommended that system designers should layout the PCB backplane such that the differential traces match the characteristic impedance of Category 5 or 5E UTP cable, which is ~100Ω."
It is understood that transformerless operation should be implemented on PCB connections only (not cable).
We will implement a short cable (1m) transformerless design anyway, with a fallback option to transformer operation. I will post the results in a couple months, hopefully I wont forget.
Gateware Communications GmbH
I am doing something similar as well. I have successfully used an Intel I210 adapter, removed the integrated RJ45, and wired directly to another CCA as a PHY to PHY type implementation (less than 12"). The final design shall be consolidated on one PCB. Vitesse has a white paper that discusses PHY to PHY (transformerless) which has been useful. It's pretty easy to do as the I210 is a voltage mode type versus the current mode design.
Please let us know how you've progressed.
Hello, Everyone. It appears that document 480093 is not available for general distribution. Andy, I sent your request to Tracy, the account manager who covers your geographical territory to see if she can offer any assistance. At this time I don't have clear idea of the timing of when/if that document will be made available on the website. Sorry for the inconvenience. LynnZ.
I learned a bit more about this document. It describes how to do a magnetic-less design with i210. As magnetics help protect the chip it is highly recommended to avoid magnetic-less designs in order to prevent potential problems. Hope this helps! LynnZ
thank you for the information in IPS.
The Intel 82580/I350/I210 Magnetic-Less LAN Design Guide (BH_PWVL_SPVL_MagneticLess_v1.1.pdf) was the right one for me.
In the moment we don't know which Ethernet controller / phys we are connected.
This depend also on our customer.
The document shows me the basics and describe the different between current mode and voltage mode.
So I assume it could be a problem to use one end a voltage mode and other end a current mode.