• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 2 answers
  • Subscribers 33 subscribers
  • Views 573 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.

DS80PCI102: PCIe 1.1 Compliance Test

Kuramochi Tadahiko
Guru 28715 points
Part Number: DS80PCI102

Hi,

Has the system includedDS80PCI102 passed PCIe 1.1 Compliance Test?

Though my customer is trying to pass PCIe 1.1 Compliance Test, they can not pass below items on their system.

Fail parameter is "Tx, Deemphasized Voltage Ratio".

Output waveform is below;

7750.output waveform.xlsx

I think that transition bit should not be implemented deemphasis.

However observed waveform is implemented de-emphasis on transition bit, 

Can we delay to implement de-emphasis as red broken line on the above attached file?

or is there any way or confirmation to pass the compliance test?

They use the device as Master mode, I attach writing data.

Fullscreen AVHCe1_180227-1R1V_EQ-3r7_DEM-3r5.txt Download 
:10000000000010000004070000ED40000ED4002F97
:10001000AD4002FB1400005F628005F5A8005F5A46
:100020008005F5A800005454FFFFFFFFFFFFFFFF0E
:10003000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFD0
:10004000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFC0
:10005000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFB0
:10006000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFA0
:10007000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF90
:10008000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF80
:10009000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF70
:1000A000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF60
:1000B000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF50
:1000C000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF40
:1000D000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF30
:1000E000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF20
:1000F000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF10
:10010000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
:10011000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEF
:10012000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFDF
:10013000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFCF
:10014000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFBF
:10015000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFAF
:10016000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF9F
:10017000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF8F
:10018000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF7F
:10019000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF6F
:1001A000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5F
:1001B000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF4F
:1001C000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF3F
:1001D000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF2F
:1001E000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF1F
:1001F000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0F
:00000001FF

CHA_Sel RATE is set into "1" = GEN1/2 mode.

Please let me know if you have any question.

Best Regards,

Kuramochi

  • 0
    TI__Mastermind 43795 points

    Hi Kuramochi,

    The de-emphasis is optimized for a 8 Gbps signal.  Although the timing is short for a 2.5 Gbps signal the result will still be quite good.  I would just take the reading manually instead of using the automated compliance test script for this measurement.

    Regards,

    Lee

  • 0 in reply to Lee Sledjeski
    Guru 28715 points

    Lee-san,

    Thank you for your information. I understood.

    How about the below question?

    "Has the system includedDS80PCI102 passed PCIe 1.1 Compliance Test?"

    Best Regards,

    Kuramochi

  • 0 in reply to Kuramochi Tadahiko
    TI__Mastermind 43795 points

    Hi Kuramochi,

    The DS80PCI102 has been used in Gen1/2/3 systems for many years.  It is compatible with the PCIe specification and PCIe applications.  It cannot be fully compliant to the PCIe specification, repeaters are not part of the specification.  In any case the DS80PCI102 does produce a clean -3.5 dB output waveform which is not compatible to the measurement software.  In actual system operation this waveform will work well.  In all the years of production we have not seen any issues working in a PCIe Gen1 system.

    Regards,

    Lee