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WEBENCH® Tools/DS80PCI800: Webench simulation tool

Kai Hsiao
Guru 12675 points
Part Number: DS80PCI800
Other Parts Discussed in Thread: DS80PCI810, , DS125BR111, DS100BR111

Tool/software: WEBENCH® Design Tools

Dear Sir 

Do you have the user guide to teach how to use this tool ??

Thanks 

  • 0
    TI__Mastermind 43795 points

    Hi Kai,

    It is not a user guide, but this presentation does go over some WEBENCH simulations in a PCIe application.

    Hopefully this can get you started.

    PCI Simulations with WEBENCH Interface Designer.pdf

    Best Regards,

    Lee

  • 0 in reply to Lee Sledjeski
    Guru 12675 points

    Dear Lee

    Could you kindly help to provide DS80PCI810 and DS80PCI800's ac boost table ??

    Below is DS125BR111's ac boost table 

  • 0 in reply to Kai Hsiao
    TI__Mastermind 43795 points

    Hi Kai,

    You are showing the boost table for the DS100BR111.  The overall CTLE table for the DS80PCI800 and the DS100BR111 is equivalent.

    The DS125BR111 and the DS80PCI810 also share a CTLE design.  The table below shows the CTLE gain vs. frequency for the DS125BR111 and the DS80PCI810.

    Regards,

    Lee

  • 0 in reply to Lee Sledjeski
    Guru 12675 points

    Dear Lee

    Thanks for your reply

    My total trace length is 20 inch and have 2pcs of 0.55M cable ,

    1. Do you have the suggest EQ setting ?? 

    2. We change the SD_TH value from 00 to 01 ,the error message will be decreased ,Do you have any idea how to find tune SD_TH's value ??

    Thanks 

  • 0 in reply to Kai Hsiao
    TI__Mastermind 43795 points

    Hi Kai,

    Since you have moved to the most sensitive Signal Detect threshold and there are still errors, the only thing still open to try is forcing the DS80PCI800 output to remain active.  The 20" of trace and 2 cables must represent a significant level of signal loss.

    To force the outputs to stay active SMBus access is required.

    The following DS80PCI800 registers must be written

    Reg       Value

    0x06 = 18'h

    0x0D = 02'h

    0x14 = 02'h

    0x1B = 02'h

    0x22 = 02'h

    0x2A = 02'h

    0x31 = 02'h

    0x38 = 02'h

    0x3F = 02'h

    Regards,

    Lee

  • 0 in reply to Lee Sledjeski
    Guru 12675 points

    Dear Lee

    After check  

    The DS80PCI800 EQ is different between 800 datasheet and BR111 boost table

    Could you kindly help to check again ?

    Thanks

  • 0 in reply to Kai Hsiao
    TI__Mastermind 43795 points

    Kai,

    The numbers are from various sources and simulations.  The circuits are very similar and respond in the same way.  There is only one table for both devices. 

    The change in numbers likely comes from the low frequency used to calculate the high frequency gain.

    Regards,

    Lee