DP83869HM: SGMII / 100M mode with only using 2 capacitively coupled channels

Michael T Schneider

Part Number: DP83869HM
Other Parts Discussed in Thread: DP83869

Just wanted to confirm that the DP83869HM ethernet part will work ok in SGMII / 100M mode with only using 2 capacitively coupled channels (A & B) on the diff transmit/receive side

I did find this e2e post here:

https://e2e.ti.com/support/interface-group/interface/f/interface-forum/791896/dp83869hm-phy-to-phy-capacitive-coupling

My understanding is that the 83867 is not a good choice due to packet loss, but the 83869 had been tested and passed capacitive coupling. I see this post is over 3 years old, so has testing and characterization been done since this was written?

Will it still require a like part that supports cap coupling? Why is this the case for 100M mode?

over 4 years ago

0 Kallikuppa Sreenivasa over 4 years ago

TI__Guru**** 216320 points

Hello Micheal T Schneider,

Thank you for the query.

You are looking for transformer less operation on the MDI side for 100M - DP83869 should be ok for this requirement.

I see this post is over 3 years old, so has testing and characterization been done since this was written? Can you please elaborate on what you are looking for.

Will it still require a like part that supports cap coupling? I believe both devices would need to be supported and this is same for 100M or 1000M. This is not specific to 100M

Please refer to below link for additional details

(+) DP83867IR: DP83867IR - Interface forum - Interface - TI E2E support forums

Regards

Sreenivasa

0 Kallikuppa Sreenivasa over 4 years ago in reply to Kallikuppa Sreenivasa

TI__Guru**** 216320 points

Hello Micheal T Schneider,

Did you have a chance to look into the inputs ?

Regards,

Sreenivasa

0 Kallikuppa Sreenivasa over 4 years ago in reply to Kallikuppa Sreenivasa

TI__Guru**** 216320 points

Hello Micheal T Schneider,

I will close the thread since i have not heard from you.

Regards,

Sreenivasa