• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 34 subscribers
  • Views 753 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

DS15MB200: DS15MB200 Used for SGMII Multiplexer

DS15MB200: DS15MB200 Used for SFP Multiplexer

Huang Lzzy
Prodigy 30 points

Part Number: DS15MB200

I want use ds15mb200  mux the xilinx artix-7 FPGA  gtp(1000Mbps) and lvds_25(100Mbps) signals.

Attached are Schematic .

Really appreciate if you can have a review on this. Thanks.

SFP differential signals spec as blew

FPGA GTP TX and RX front end structure as blew

GTP Tx and Rx is CML driver and  receiver.

I think the schematic is all right,use LVDS drive ac-couped sfp(lvpecl signal),but not sure.

Whether the LVDS swing (350mv ) can drive the sfp  signal?

Another question : When Output Pre-Emphasis is 100%,the single-end swing is ?

There is no datasheet diagram on the effect of pre-emphasis on amplitude.

sfp_mux.pdf

  • 0
    TI__Guru* 93570 points

    Greetings,

    Schematic is fine. Please note based on data sheet diagrams, even though it is not mentioned directly, it seems device is characterized at 250Mbps and higher data rate. Also, you are using 0.1uF AC coupling Cap and thus you may need to increase this value to account for the low frequency content of your data pattern. Or perhaps you can DC couple to eliminate the AC coupling Cap effects and lower data rate.

    1). I believe 350mV should be sufficient to drive the SFP module.

    2). Pre-emphasis is either on or off. The single ended level would be half of what is shown in the data sheet.

    Regards,Nasser