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Hi, For Transceiver IO's do we need to match trace length for multiple channels/lanes for 40GB Ethernet using QSFP+ connector ?

HMusu
Beginner
‎04-23-2020 06:51 AM
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CheePin_C_Intel
Employee
‎04-24-2020 10:22 AM
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Hi,

 

As I understand it, you have some inquries related to the trace length matching. For your information, generally for 40G Ethernet, there will be 10G x 4 bonded XCVR lanes. It is recommended for you to match the length for these lanes to ensure minimal lane-lane skew.

 

Just for ddditional information, you may also refer to the device datasheet ie "Transmitter Channel-to-channel Skew Specifications" in A10 device datasheet for max TX CH-CH skew within the FPGA.

 

Please let me know if there is any concern. Thank you.

 

Best regards,

Chee Pin

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