AM62P-Q1: Adjust USB 2.0 high speed PHY parameters

Alvis Yang

Prodigy 70 points

Part Number: AM62P-Q1
Other Parts Discussed in Thread: TPS65921, AM62P

Tool/software:

Hi TI,

I'm looking for USB PHY parameters in AM62P-Q1 that can be adjusted to pass USB 2.0 high speed eye diagram test.

For example, output impedance and drive strength.

I'm taking a snapshot from the application note of TPS65921 as an example:

Thank you,

Alvis

4 months ago

0 Kallikuppa Sreenivasa 4 months ago

TI__Guru**** 191149 points

Hello Alvis,

Thank you for the query.

As i understand, there is no support or provision for adjusting the USB parameters'.

Let me check internally and confirm.

Regards,

Sreenivasa

0 Luis Parga 3 months ago

TI__Intellectual 830 points

Hi Alvis,

Could you help to provide more details on the setup you are using that is causing issues? Is this with host or device mode? Do you have common mode chokes and/or ESD diodes on D+/D- lines? We have seen having these might deteriorate signal quality. Are you using the USB-IF electrical analysis tool for test packet waveform analysis? I suppose you are using near end in order to use worst-case eye mask. What vCore configuration (0.75V or 0.85V) are you using? The USB2.0 IP itself does support HS differential voltage swing tuning, but this has not been validated within TI and thus it is not currently supported. Can you provide more details on the failure being observed? Is it marginal?

Best regards,

Luis Parga

0 Alvis Yang 3 months ago

Prodigy 70 points

Hi Luis,

Thanks for the reply.

This inquiry is based on that we're evaluating whether AM62P-Q1 is a suitable platform candidate for us and want to understand the capability of this platform.

I don't face any issue yet.

I have no further questions and will close this ticket.

Thanks again for the help.

Regards,

Alvis

0 Kallikuppa Sreenivasa 3 months ago in reply to Alvis Yang

TI__Guru**** 191149 points

Hello Alvis,

Thank you.

We have high speed design guide that is included in the Hardware Design Considerations guide.

Recommended References for review and design of custom board
AM62P
Data sheet
AM62Px Sitara Processors datasheet
www.ti.com/.../sprsp89
Hardware Design Considerations
www.ti.com/.../sprada9
DDR Board Design and Layout Guidelines
www.ti.com/.../sprad66
Schematic Design and Review Checklist for AM62Px processor family
www.ti.com/.../spradn4
Schematic Design and Review Checklist combined for sitara processor families
www.ti.com/.../sprad21
Errata
www.ti.com/.../sprz574

AM62P Schematic checklist
e2e.ti.com/.../faq-am625-am623-am62a-am62p-am62d-q1-am64x-am243x-design-recommendations-custom-board-hardware-design---schematics-review-checklists

AM62P Schematic self-review
e2e.ti.com/.../faq-am62p-am62p-q1-design-recommendations-custom-board-hardware-design---custom-board-schematics-self-review
e2e.ti.com/.../faq-am625-am623-am62a-design-recommendations-commonly-observed-errors-during-custom-board-hardware-design-sk-schematics-updates-for-design-update-note
e2e.ti.com/.../faq-am625-am625-am623-am62a-am62p-am62d-q1-am64x-am243x-design-recommendations-custom-board-hardware-design---list-of-errors-observed-during-customer-schematics-review
e2e.ti.com/.../faq-am625-am623-am62a-am62p-am62d-q1-am64x-am243x-design-recommendations-custom-board-hardware-design---queries-related-to-soc-data-sheet-pin-attributes

Regards,

Sreenivasa

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AM62P-Q1: Adjust USB 2.0 high speed PHY parameters