Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

open-drain option for differential I/O pin

Hi

I have downloaded a reference design (PCIe to External Memory) for arria ii gx. I am trying to reinstantiate and regenerate and recompile the design. However, it fails during fitting. The errors are as belows:

Error: Can't turn on open-drain option for differential I/O pin mem_dqs[1]

Error: Can't turn on open-drain option for differential I/O pin mem_dqsn[1]

I can't anything in the design related to open drain. Any clue?

Thanks

3 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    14 years ago

    the script might not run successfully. you may check if there is any error msg from the tcl console in quartus.

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    14 years ago

    I do run the script. After running the script, my .qsf is different from the .qsf of reference design. The error still exists.

    Currently what i do is i copy assignment in the .qsf of reference design to my .qsf.