topic PCIe line impedance in i.MX Processors https://community.nxp.com/t5/i-MX-Processors/PCIe-line-impedance/m-p/576333#M88037 <HTML><HEAD></HEAD><BODY><P>Hi</P><P></P><P>I am using PCIe to communicate between an IMX6 and IGLOO2 FPGA, both mounted on the same PCB.</P><P>The IMX6 hardware development manual says to route PICe at 85 ohms differential impedance, yet the SABRE_SD evaluation board, IMX6 REX and other designs I have seen all route PCIe lines at 100 ohm differential.</P><P></P><P>The IGLOO2 can terminate to 80, 100 or 120 ohm differential, should I use 85 or 100 ohm impedance lines?</P><P>Can anyone explain why the hardware development guide says 85 ohms yet everyone else seems to use 100 ohm lines?</P><P></P><P></P><P>Regards,</P><P>Dominic</P></BODY></HTML> Fri, 15 Jul 2016 10:05:45 GMT dominicmusgrove 2016-07-15T10:05:45Z PCIe line impedance https://community.nxp.com/t5/i-MX-Processors/PCIe-line-impedance/m-p/576333#M88037 <HTML><HEAD></HEAD><BODY><P>Hi</P><P></P><P>I am using PCIe to communicate between an IMX6 and IGLOO2 FPGA, both mounted on the same PCB.</P><P>The IMX6 hardware development manual says to route PICe at 85 ohms differential impedance, yet the SABRE_SD evaluation board, IMX6 REX and other designs I have seen all route PCIe lines at 100 ohm differential.</P><P></P><P>The IGLOO2 can terminate to 80, 100 or 120 ohm differential, should I use 85 or 100 ohm impedance lines?</P><P>Can anyone explain why the hardware development guide says 85 ohms yet everyone else seems to use 100 ohm lines?</P><P></P><P></P><P>Regards,</P><P>Dominic</P></BODY></HTML> Fri, 15 Jul 2016 10:05:45 GMT https://community.nxp.com/t5/i-MX-Processors/PCIe-line-impedance/m-p/576333#M88037 dominicmusgrove 2016-07-15T10:05:45Z Re: PCIe line impedance https://community.nxp.com/t5/i-MX-Processors/PCIe-line-impedance/m-p/576334#M88038 <HTML><HEAD></HEAD><BODY><P>Hi Dominic</P><P></P><P>differential impedance is 85ohm in PCIe gen2 according to</P><P>PCIe specification in PCI-SIG.</P><P>Also one can references to it, like IDT AN808 or others.</P><P></P><P>Best regards</P><P>igor</P><P>-----------------------------------------------------------------------------------------------------------------------</P><P>Note: If this post answers your question, please click the Correct Answer button. Thank you!</P><P>-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Fri, 15 Jul 2016 11:20:49 GMT https://community.nxp.com/t5/i-MX-Processors/PCIe-line-impedance/m-p/576334#M88038 igorpadykov 2016-07-15T11:20:49Z