usb2 trace length on the HX3 hub

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nimu_4164261
Level 1
Level 1
  1. Hi.

I am in a middle of layout stage with your items HX2 and
HX3.

I am using the HX3 - CYUSB3314.

I have long trace length constrain  - 4 inch for
USB2:  DS3_D (pins 77 and 78) on the CYUSB3314.

When reading cypress  HX3 HW  design guide (AN91378)

, page16, I can see information regarding the SS lines  - up to 11inch’s,length,  which is great.

But no info regarding the USB2 signal length.

Could you please advise, What is the maximum allowed , trace length for USB2, with the HX3 - CYUSB3314, and especially on this specific
pins (77, 78) driver
?

thx.

nitsan.




 
 
 
 
 
 
 
 
 
 
 
 

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1 Solution
Sananya_14
Moderator
Moderator
Moderator
750 replies posted 500 replies posted 250 solutions authored

Hi Nitsan,

The trace length should be within 3 inches for USB 2.0 lines. Please refer to Page 16 in the HX2VL hardware guidelines which are applicable for any 2.0 D+/D- traces.

Best Regards,

Sananya

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1 Reply
Sananya_14
Moderator
Moderator
Moderator
750 replies posted 500 replies posted 250 solutions authored

Hi Nitsan,

The trace length should be within 3 inches for USB 2.0 lines. Please refer to Page 16 in the HX2VL hardware guidelines which are applicable for any 2.0 D+/D- traces.

Best Regards,

Sananya

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