SN75LVPE5421: Length Mismatch spec in pin mode

Tiger Yeh

Part Number: SN75LVPE5421
Other Parts Discussed in Thread: TIGER

Hi,

In pin mode, port A and port B EQ index will be same.

Thus, my customer want to know whether there is any suggestion or spec requirement for mismatch control on port A and port B routing?

Thanks and Best regards,

Tiger

over 3 years ago

+1 Nasser Mohammadi over 3 years ago

TI__Guru* 93570 points

Hi Tiger,

Per PCIe specification, there is not a strict requirement for length matching between differential pairs of slot A or slot B - this is called inter-pair skew. These should be within 4-5 inches at Gen5. However, there is a strict less than equal to 5-mils between positive and negative lead of each channel. For example, in your diagram, TXAnP and TXAnN lengths must be within 5-mils.

Regards,Nasser

0 Tiger Yeh over 3 years ago in reply to Nasser Mohammadi

TI__Expert 5955 points

Thank you very much! Nasser

Have a nice day.

Best regards,

Tiger

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SN75LVPE5421: Length Mismatch spec in pin mode