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[802.3_10SPE] AW: [802.3_10SPE] Thoughts on T1S PSD mask

Hi all,


it is an interesting idea, to not tie the upper PSD limit to the requirements of the Automotive application in order to enable other applications to have more headroom to their link/application.


However: the “suggested upper safe PSD mask” for Automotive should definitely still fit into a consistent picture of link segment definition, EMC environments/limits and signal integrity …


Regards, Conrad




Von: Martin Miller [mailto:Martin.Miller@xxxxxxxxxxxxx]
Gesendet: Dienstag, 6. März 2018 14:29
An: STDS-802-3-10SPE@xxxxxxxxxxxxxxxxx
Betreff: [802.3_10SPE] AW: [802.3_10SPE] Thoughts on T1S PSD mask


Hi all,


I agree, that it’s not necessary to put the “automotive burden” on all applications. Typically the closer automotive limits beside other automotive details are covered by the specifications of the OPEN Alliance.


Best Regards



Microchip Technology Germany II GmbH & Co. KG

Martin Miller

Senior Manager, Marketing & Applications, Automotive Networking

Emmy-Noether-Straße 14, 76131 Karlsruhe| Germany

Tel: +49 (0)721 625 37 455

Mobile: +49 162 276 67 04

Fax: +49 (0)721 625 37 469 

martin.miller@xxxxxxxxxxxxx |



Von: Piergiorgio Beruto [mailto:piergiorgio.beruto@xxxxxxxxxxxxxx]
Gesendet: Dienstag, 6. März 2018 05:39
An: STDS-802-3-10SPE@xxxxxxxxxxxxxxxxx
Betreff: [802.3_10SPE] Thoughts on T1S PSD mask


Hi all,

I wish to share a thought about the discussion on the PSD mask to meet the EMC / EMI.

I think we might be focusing on the wrong problem: currently our objctives say that we shall not preclude fulfilling automotive and industrial requirements.

The upper limit of the PSD mask (which is under discussion) does not actually preclude anything. Implementers are always free to design a PHY with lower PSD to meet automotive requirements.

The problem should instead be addressed at the lower PSD mask which, if set too high, could indeed preclude achieving EMI performance.


Moreover, I think we really ought to increase the upper level of the PSD mask by at least 6dB in order not to preclude simpler/robust implementations for the industrial and backplane use cases.

Maybe we could also suggest a different upper mask that we consider safe (i.e. with enough margin) for the automotive use case.


Please if anyone has opinions on this to share, I would greatly appreciate it.

Best Regards,






Piergiorgio Beruto

Senior System Designer


Canova Tech Srl.

"The Art of Silicon Sculpting"


Via Magliotto 2,

Campus Savona, Palazzina Branca

17100 Savona (SV), Italy

Phone:  +39 049 7811065 ext. 265

GSM:    +39 333 6333289

Fax:    +39 019 264797

Skype:  canovatech_pb

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