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lambert_yu's avatar
lambert_yu
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4 years ago

About PRESERVE_UNUSED_XCVR_CHANNELfor transceiver application

Hi all , quartus prime 16.0 standard & quartus prime standard 18.0.0 FPGA : arria 10 (10AX115N2F45E1SG) For this subject, I have question : (1) from the link : Why do unused tr...
Deshi_Intel's avatar
Deshi_Intel
Icon for Regular Contributor rankRegular Contributor
4 years ago

HI Lambert,


I read back the 2nd KDB link again. I am sorry, I think I explained wrongly to you.


If your plan is to use v18.0 in Rx simplex only while preserve its corresponding Tx channel


Then

  • you should not preserve the Tx channel using the preserve qsf command since there is bug in v18.0 as mentioned in the KDB. So, remove all your preserve qsf command
  • you should preserve the Tx channel using the workaround instead which is instantiate a minimum datarate, dummy simplex transmitter IP corresponding to the used simplex receiver. You can set a static 0x00 pattern on the Tx parallel port, and select minimum VOD.


Thanks.


Regards,

dlim


  • lambert_yu's avatar
    lambert_yu
    Icon for Contributor rankContributor
    4 years ago

    Hi,

    You mean that I should not use any of the below assignment on quartus 18.0.0:

    set_global_assignment -name PERSERVE_UNUSED_XCVR_CHANNELON

    and

    set_global_assignment -name PERSERVE_UNUSED_XCVR_CHANNEL <PIN_NAME>

    right?

    And what's the workaround, I didn't find it, could you please provide more detail information?

    Brs,

    Lambert