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TLK2711-SP: BER threshold for built-in BERT function

Ryuuichi machida
Guru 13200 points

Part Number: TLK2711-SP

Hello,

I would like you to confirm BER thresold setting about built-in BERT.

According to datasheet, there is following description.

The TLK2711-SP also has a built-in BERT function in the receiver side that is enabled by the PRBSEN.

However, there is no description about BER threhold.

On the other hand, there is following description in datasheet.

Input conditions in the data sheet were created and validated to achieve a bit error rate (BER) of 1 error in 1E12 bits or better.

Is  BER threhold of built-in BERT set as 1E-12 as well ?

BR, 

  • 0
    TI__Mastermind 19235 points

    Hi,

    There should be no BER floor due to the TLK chip PRBS checker function itself. You should be able to achieve BER of 1E-12 or better with it. The BER level is determined and bounded by the link properties i.e. the transmission channel electrical characteristics plus Tx signal characteristics and Rx EQ settings.

    Regards,

    Rodrigo Natal

  • 0 in reply to Rodrigo Natal
    Guru 13200 points

    Hello Rodrigo-san,

    >You should be able to achieve BER of 1E-12 or better with it.

    >The BER level is determined and bounded by the link properties i.e. the transmission channel electrical characteristics plus Tx signal characteristics and Rx EQ settings.

    What I want to confirm is how much time user should run PRBS function to realize BER of 1E-12.

    In my understanding, BER should depend on confidence level which is set by user and number of transmit bits .

    (In other words, confidence level can be calculated by using BER threshold and number of tranmit bits.)

    When user transmit PRBS data as 2.5Gbps(GTX_CLK = 125MHz), could you please tell me how much time user should run PRBS function to realize BER of 1E-12 and how user can calculate ?

    BR,

  • 0 in reply to Ryuuichi machida
    TI__Mastermind 19235 points

    Hi,

    The minimum BER = 1 E-12 data test iteration is one where at least one error is observed after at least 1E+12 bits have been transmitted. Thus the time for a single 1E-12 iteration is equal to 1E+12 divided by the data rate. If the data rate is 2.5Gbps then t(1E-12) = 400 seconds. Three 1E-12 test iterations are however desired to achieve reasonable confidence, so the TI recommended time is 3 * 400s or 1200 seconds (20 minutes) at 2.5Gbps data rate to guarantee BER = 1E-12.


    Cordially,

    Rodrigo Natal

    HSSC Applications Engineer