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DS160PR810: Using fiber optic to transmit PCIE signals

Part Number: DS160PR810

Tool/software:

hi TI Team :

     we wanted to design our hardware boards to achieve PCIe X8 long distance transform by DS160PR810;  the tx link is CPU --> DS160PR810 -> optical fiber --> DS160PR810  ->FPGA; the rx

link is FPGA ->DS160PR810  -> optical fiber  -> DS160PR810 -> CPU; we want to achieve PCIe GEN2 X8, but now we only can achieve PCIe GEN2 X1  on Windows Device Manager, and the transform system isnot

stable; we want to know the design  link is corrected ? and how to config DS160PR810 to achieve PCIe GEN2 X8 ?

    thank you very much ,  looking forward your reply 

  • Greetings,

    Typically we do not recommend cascading multiple or two redrivers such as what you have shown in the signal path. This is because this affects signal performance.

    Also, in PCIe applications there is link training. In this case, a redriver acts in its linear region more like an analog buffer. Typical optical modules are NRZ based and do not let link training to go through. To force the redriver to operate in non-linear or NRZ mode please set RX_Det to L0 (i.e disable PCIe rx detect state machine).

    Regards, Nasser