iMX51 USB2.0 compliance test failed because of invalid bit rate

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iMX51 USB2.0 compliance test failed because of invalid bit rate

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torus1000
Contributor V

Hi all,

I tried iMX51 USB2.0 compliance test but failed because of the bit rate was not 480Mbps but 433Mbps.

Anybody knows the reason why bit rate is so low?  How can I adjust it to 480Mbps?

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YixingKong
Senior Contributor IV

Torus1000

This discussion is closed since no activity. If you still need help, please feel free to reply with an update to this discussion, or create another discussion.

Thanks,

Yixing

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YixingKong
Senior Contributor IV

Torus1000

We have not got your response yet and will close the discussion in 3 days. If you still need help, please feel free to reply with an update to this discussion.

Thanks,

Yixing

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YixingKong
Senior Contributor IV

Torus1000

We are sorry for getting back to you so late. Are you still stuck with the issue? If you have somehow to resolved the

issue, can we close the discussion? If you still need help, please feel free to reply with an update to this discussion.

Thanks,
Yixing

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b36401
NXP Employee
NXP Employee

It seems there is something wrong with test conditions.

Please check "usb_phy_clk_root" settings. Please look at

Figure 7-44 "Serial Clock Generation (3 of 7)" of i.MX 51

Refernce Manual.

Also I am sending you USB High Speed EHOST Electrical

Validation Report for i.MX51 processor.

http://photo.afti.ru/tmp/fs/USB_Electrical_Validation_report_USBD0964.pdf

Please pay attention on chapter 3.1 "Test Procedures".