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TLK4250 Re-sync time (which option to choose?)

Dale Wlasitz
Intellectual 1080 points

Our customer has the following questions:

...and education from an FAE is the loss of sync and resync aspects in the TI TLK 4250.

 


Upon loss of sync, the datasheet says that there are two options:
 
1)      Have the transmitting chip send SYNC patterns to speed up resync on the receiving end
 
or
 
2)      Let the receiving chip re-synchronize itself with the start/stop bit.
 
 
The questions that we have are:
 
1)      Assuming truly random data payload, what’s the difference in terms of resync time between the two options?
 
2)      What is recommended by TI on that subject?

 

 

Please advise your thoughts as soon as you are able.  Thanks~!!!!

Dale

 

 

 

  • 0
    TI__Intellectual 1810 points

    Dale,

    1. The difference in resync time between the two methods is unknown since one is deterministic and the other is completely random.

    2. The SYNC pattern option is always recommended at the start of data transmission and at a certain regular time interval which is system dependent. For a sytem where the deserializer has a greater chance to lose sync, the SYNC patterns should be sent more often. Some experimentation may be needed to determine the appropriate time interval for sending the SYNC patterns and limit the effect on the data throughput. Of course the best option, where possible, is to tie the deserializer's LOCKBx pins to the serializer's SYNCx pins to make sure that the SYNC patterns are automatically sent whenever there is a sync loss.

    Best regards.

    Hassan.