• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 34 subscribers
  • Views 360 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.

DS125BR111: EEPROM check

Shu-Cheng LIN
Guru 11785 points

Part Number: DS125BR111

Hi Sirs,

Sorry to bother you 

Two questions on DS125BR111

1. If our signal insertion loss  will be 30db, could we use serial connect for large insertion loss application

2. If we use EEPROM control, do we need one EEPRON by one solution? the other word is actually we'll put 12 pcs BR111 on MB, how many EEPROM do we need? 

Thanks!!

  • 0
    TI__Mastermind 43795 points

    Hi,

    What type of application?  For PCIe 3 a single DS125BR111 usually works in applications up to 30dB, in SAS-3 the maximum channel length is a little higher ~ 32dB.

    A single EEPROM can program up to 16 devices.  In most cases several devices can share the same EEPROM coding so they do not take up a lot of space.

    Regards,

    Lee 

  • 0 in reply to Lee Sledjeski
    Guru 11785 points

    Hi Sirs,
    Thanks for your reply.
    I would like to know is there any relevant document description on "for PCIe 3 a single DS125BR111 usually works in applications up to 30dB, in SAS-3 the maximum channel length is a little higher ~ 32dB" ??

  • 0 in reply to Shu-Cheng LIN
    TI__Mastermind 43795 points

    I do not have a specific document to share.  The base compliance channel for PCIe Gen3 is -22dB.  The DS125BR111 can compensate for ~ 10dB of channel attenuation.  Between the PCIe link training and the DS125BR111 CTLE gain it is possible for the complete system to work at just over 30dB of loss @ 4GHz.

    Of course as channels get longer it is even more important to keep noise low, highly attenuated signals are even more sensitive to crosstalk.

    Regards,

    Lee