What is the common mode voltage for the PCIe receive inputs?

取消
显示结果 
显示  仅  | 搜索替代 
您的意思是: 

What is the common mode voltage for the PCIe receive inputs?

3,538 次查看
cbobek
Contributor I

Hi,

We have measured eye diagrams for our i.MX8 design and they meet specification.  We also measured common mode voltage for the PCIe receiver inputs (PCIE1_RXN and PCIE2_RXN) and they are 0V on the BGA pads.  I normally expect to see a DC bias voltage above 0V on this type of interface.

What is the common mode voltage or DC bias voltage for PCIE1_RXN and PCIE2_RXN?

Thank you,

Chris

标记 (3)
0 项奖励
回复
1 回复

3,132 次查看
igorpadykov
NXP Employee
NXP Employee

Hi Chris

i.MX8 PCIe interface is compatible with PCIe specification, which defines

PCIe Rx AC common mode voltage VRX-CM-AC-P < 150mV,

description can be found for example on p.87

https://www.keysight.com/upload/cmc_upload/All/PCI_Express_Compliance_Testing.pdf 

Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

0 项奖励
回复