• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 34 subscribers
  • Views 759 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.

TLK2711 PRBS

Pascal AVART
Prodigy 100 points

Hi,

I have to test a link between two TLK2711 (one transmitter and on receiver).

I would like to use the TLK2711 PRBS for this test.

Can you send me the exactly bit stream generated by the PRBS?

How does the PRBS, is the bit stream generated one time or permanently ?

Regards.

  • 0
    TI__Mastermind 20820 points

    Hi Pascal,

    A quick Google search of PRBS will yield you a ton of good information on this topic.Basically though PRBS is deterministic. Inside of a PRBS generator n flip flops are used to create the PRBS pattern of length n. PRBS 27-1 will use 7 flip flops in which bits 6 and 7 are XORed together creating a incrementing bit sequence. This works the for 223-1 and 231-1 and so on. The only pattern that in not valid in PRBS would be a pattern that contained all zero's because 0 XORed with 0 yields you a 0 and you would be stuck there forever. The starting point of the sequence will change from PRBS generator to PRBS generator depending on the seed value but that is irrelevant as the PRBS pattern continuously loops through the same 127 (PRBS 27-1) values.

    Regards,

    Mike

  • 0 in reply to Michael Peffers
    Prodigy 10 points

     

     

    The PRBS generator produce a periodic sequence with 127 different values => 7 bits needed. But the width of the output of the PRBS generator is 10 bits (fig 1 : TLK2711A block diagram of its datasheet). What is the relationship between the 7 bits and the 10 bits please?

    I will monitor the RKLSB and RKMSB for example.

    THANK YOU VERY MUCH