topic Re: What is the common mode voltage for the PCIe receive inputs? in i.MX Processors https://community.nxp.com/t5/i-MX-Processors/What-is-the-common-mode-voltage-for-the-PCIe-receive-inputs/m-p/965345#M143843 <HTML><HEAD></HEAD><BODY><P>Hi Chris</P><P></P><P>i.MX8 PCIe interface is compatible with PCIe specification, which defines</P><P>PCIe Rx AC common mode voltage VRX-CM-AC-P &lt; 150mV,</P><P>description can be found for example on p.87</P><P><A class="link-titled" href="https://www.keysight.com/upload/cmc_upload/All/PCI_Express_Compliance_Testing.pdf" title="https://www.keysight.com/upload/cmc_upload/All/PCI_Express_Compliance_Testing.pdf">https://www.keysight.com/upload/cmc_upload/All/PCI_Express_Compliance_Testing.pdf</A>&nbsp;</P><P></P><P>Best regards<BR />igor<BR />-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Thu, 08 Aug 2019 05:47:07 GMT igorpadykov 2019-08-08T05:47:07Z What is the common mode voltage for the PCIe receive inputs? https://community.nxp.com/t5/i-MX-Processors/What-is-the-common-mode-voltage-for-the-PCIe-receive-inputs/m-p/965344#M143842 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P></P><P>We have measured eye diagrams for our i.MX8 design and they meet specification.&nbsp; We also measured common mode voltage for the PCIe receiver inputs (PCIE1_RXN and PCIE2_RXN) and they are 0V on the BGA pads.&nbsp; I normally expect to see a DC bias voltage above 0V on this type of interface.</P><P></P><P>What is the common mode voltage or DC bias voltage for PCIE1_RXN and PCIE2_RXN?</P><P></P><P>Thank you,</P><P></P><P>Chris</P></BODY></HTML> Thu, 08 Aug 2019 00:29:29 GMT https://community.nxp.com/t5/i-MX-Processors/What-is-the-common-mode-voltage-for-the-PCIe-receive-inputs/m-p/965344#M143842 cbobek 2019-08-08T00:29:29Z Re: What is the common mode voltage for the PCIe receive inputs? https://community.nxp.com/t5/i-MX-Processors/What-is-the-common-mode-voltage-for-the-PCIe-receive-inputs/m-p/965345#M143843 <HTML><HEAD></HEAD><BODY><P>Hi Chris</P><P></P><P>i.MX8 PCIe interface is compatible with PCIe specification, which defines</P><P>PCIe Rx AC common mode voltage VRX-CM-AC-P &lt; 150mV,</P><P>description can be found for example on p.87</P><P><A class="link-titled" href="https://www.keysight.com/upload/cmc_upload/All/PCI_Express_Compliance_Testing.pdf" title="https://www.keysight.com/upload/cmc_upload/All/PCI_Express_Compliance_Testing.pdf">https://www.keysight.com/upload/cmc_upload/All/PCI_Express_Compliance_Testing.pdf</A>&nbsp;</P><P></P><P>Best regards<BR />igor<BR />-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Thu, 08 Aug 2019 05:47:07 GMT https://community.nxp.com/t5/i-MX-Processors/What-is-the-common-mode-voltage-for-the-PCIe-receive-inputs/m-p/965345#M143843 igorpadykov 2019-08-08T05:47:07Z