Part Number: DP83TC813R-Q1
Hi team,
How to set the DP83TC813 internal PUPD?
Is it the flow of examining default settings in SI simulation, measuring actual equipment, and then setting up PU/PD?
And in the ibis model, what is the PU/PD setting for the RX/TX line?
Regards,
Youhei MIYAOKA
Hi Youhei,
When you say adjust optimal PU/PD, you are talking about the resistors connected between MAC and PHY (as circled below), correct?
If yes, then I believe their 2 pattern adjustment (first running IBIS simulation and then evaluating HW) is a valid method.
Best regards,
Melissa
Hi Melissa,
Sorry for misleading. We want to know below register setting.
You can however adjust the impedance of the TX and RX MAC interface pads. Just follow the steps mentioned in this FAQ: https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1309878/faq-dp83tc812s-q1-how-to-to-adjust-slew-rate-of-mac-ios?tisearch=e2e-sitesearch&keymatch=dp83tc812%20mac%20impedance#
As this thread, slow mode(1) is option, so they can evaluate EMC at first and then evaluate fast mode(0) if EMC emission improve.
Is my understanding correct?
Regards,
Youhei MIYAOKA
Hi Youhei,
Sorry for misleading. We want to know below register setting.
Sorry for late reply, I was on Holiday. I will have to get back to you on how to use those registers. Is the customer only interested in optimizing SI? SI can be optimized through layout. Our schematic checklists also have a "layout" recommendation tab or they can refer to this app note: https://www.ti.com/lit/pdf/snla387
As this thread, slow mode(1) is option, so they can evaluate EMC at first and then evaluate fast mode(0) if EMC emission improve.
Is my understanding correct?
Yes, that is correct.
