AM3352 USB Data loss

xing lui

Other Parts Discussed in Thread: AM3352

Hi ,

We met the usb host of AM3352 may has data loss issue. We set the USB1 as host mode.We found that the usb controller will lost one packet at random when in communication. We add up the EPCSR[n].RXCOUNT of the designated endpoint in ISR routine. It also lost one packet data number.However,We can catch the missed data packet with usb analyzer.And This transaction has no error occurs.

Our project has been halted becase the usb part has so many problems. please help.

over 9 years ago

0 Biser Gatchev-XID over 9 years ago

TI__Guru**** 393215 points

You already have a thread opened on this subject: e2e.ti.com/.../501005 Please do not double-post on this forum. This thread will be closed now.

0 xing lui over 9 years ago in reply to Biser Gatchev-XID

Intellectual 990 points

Hi Biser
This two problems are not the same. The data loss is more urgent than the before

0 Biser Gatchev-XID over 9 years ago in reply to xing lui

TI__Guru**** 393215 points

What is the software used on the AM335X?

0 xing lui over 9 years ago in reply to Biser Gatchev-XID

Intellectual 990 points

It's also the WinCE platform.Because We can't get any support from the 3rd party. And We think it's unrelated the SW,because the number we added up the EPCSR[n].RXCOUNT value is also deficient.

0 Biser Gatchev-XID over 9 years ago in reply to xing lui

TI__Guru**** 393215 points

As it was explained on the other thread WinCE is not supported by TI, AM335X BSPs for WinCE are developed and supported by 3-rd party Adeneo Embedded. From hardware perspective there are no errata in the AM335X silicon that can produce this behavior. All these issues could be caused by incorrect design of the USB section. I suggest that you review the document www.ti.com/.../spraar7e.pdf for layout and processors.wiki.ti.com/.../AM335x_Schematic_Checklist for schematic. If possible post the USB part of the schematic here.

0 xing lui over 9 years ago in reply to Biser Gatchev-XID

Intellectual 990 points

Hi Biser,
Thanks a lot.By the way,have there been any customers who using the Linux platform reported the same issue?

0 Biser Gatchev-XID over 9 years ago in reply to xing lui

TI__Guru**** 393215 points

You can find a list of reported software issues here: processors.wiki.ti.com/.../Sitara_Linux_MUSB_Issues

0 xing lui over 9 years ago in reply to Biser Gatchev-XID

Intellectual 990 points

Hi biser,

This is schematic of usb part

USB.pdf

0 Biser Gatchev-XID over 9 years ago in reply to xing lui

TI__Guru**** 393215 points

Have you tried removing the CM chokes on the USB data paths?

0 xing lui over 9 years ago in reply to Biser Gatchev-XID

Intellectual 990 points

Hi Biser,
Thanks a lot for your suggestion.I will advise our hardware engineer to do this teset.Could you tell us why you suggest to remove the CM chokes?

0 -DK- over 9 years ago in reply to xing lui

TI__Mastermind 27890 points

xing lui said:
Hi Biser,
Thanks a lot for your suggestion.I will advise our hardware engineer to do this teset.Could you tell us why you suggest to remove the CM chokes?

Any device in the transmission path can negatively affect the signal quality. CMC's significantly reduce the signal amplitude and as such can cause problems in marginal signal-quality environments.

0 xing lui over 9 years ago in reply to -DK-

Intellectual 990 points

Hi all,
bad news.The issue also occurs even if we remove the CM chokes.

0 xing lui over 9 years ago in reply to xing lui

Intellectual 990 points

Hi,
can anyone give us some advice to debug this issue?

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AM3352 USB Data loss