TUSB217-Q1: About selection of TUSB217-Q1 BOOST level and cable length

zehao chen

Part Number: TUSB217-Q1

Hi,Thank you for your reply.

This is the Eye diagrams of our test,BOOST=level 2 and RX_SEN=high,Pre=0.9 meters,Please help us to assess whether it meets the standard requirements for Eye diagrams.

Thanks for your answer!

over 6 years ago

0 zehao chen over 6 years ago

Intellectual 300 points

In addition, according to customer's request, Pre cable of TUSB217-Q1 will use data cable of 100Ω differential impedance , but the host, the post cable(user cable) and mobile devices are all 90Ω differential impedance,In this case，What differential impedance is suitable for layout of TUSB217-Q1? 90Ω or 100Ω?

Thanks for your answer!

0 Malik Barton57 over 6 years ago in reply to zehao chen

TI__Guru 64326 points

Hi,

Eye diagrams, in general, should be judged by whether they violate the eye mask (i.e. red keep out portion)to determine whether they meet the minimum requirements. I would say the above diagram is good because it does not violate the eye mask per the USB2 eye test. Does this answer your question? Please read section 10.1 Layout Guidelines of the datasheet to answer your second question.

0 zehao chen over 6 years ago in reply to Malik Barton57

Intellectual 300 points

OK,Thank you very much!

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TUSB217-Q1: About selection of TUSB217-Q1 BOOST level and cable length