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Altera_Forum's avatar
Altera_Forum
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12 years ago

Input port SERIESTERMINATIONCONTROL of I/O output buffer is not connected to a termin

I have an old build from Quartus 8.1 that I recompiled in Quartus 13.0.1. I am using a Cyclone III.

When I compile the first time, it works. If I change nothing and just click compile again, I get a list of errors saying

Error (15857): Input port SERIESTERMINATIONCONTROL of I/O output buffer "ad_rst~output" must be connected to a termination block

In my *.qsf the only descriptions I have for "ad_rst" are

set_instance_assignment -name IO_STANDARD "1.8 V" -to ad_rst

set_location_assignment PIN_C10 -to ad_rst

set_instance_assignment -name FAST_OUTPUT_REGISTER ON -to ad_rst

set_instance_assignment -name OUTPUT_TERMINATION "SERIES 50 OHM WITH CALIBRATION" -to ad_rst

and in my Verilog top program this node is defined as

inout ad_rst;

This is one example of several nodes with the same issue. Any suggestions?

Thanks in advance for you help.

4 Replies

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

    Hi,

    Is your I/O "ad_rst" one of a external memory pins ? (may be ddr)

    Many threads of the forum talk about lunching a .tcl file to fulfil pin assignment for external memory controllers.

    Keep only the location_assignment for your pin, and remove the others.

    The .tcl will do it properly for you.

    regards,
  • Altera_Forum's avatar
    Altera_Forum
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    12 years ago

    It is not an external memory pin. Just a pin that controls an external A/D chip. I have the location assigned explicitly in the *.qsf file. I have never had to use a *.tcl script before and I don't have to use it when I compile the first time and it works. Any other suggestions?

    Thanks!
  • Altera_Forum's avatar
    Altera_Forum
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    12 years ago

    A new piece of information .. if I obliterate the /db and /incremental_db and recompile .. then it works fine.

    So in summary, I had a design from Quartus 8.1 that I recompiled in Quartus 13.0.1 from an archive. The first time I compile it, everything is fine. If I just hit play to compile again, without changing anything, I get that some of my pins have that SERIESTERMINATIONCONTROL error that is stated in the above post.

    Then, if I obliterate the newly formed folders /db and /incremental_db and recompile .. it works.

    Any suggestions.

    Thank you!
  • Altera_Forum's avatar
    Altera_Forum
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    12 years ago

    One other additional piece of information .. the error seems to appear only when I use "SERIES 50 OHM WITH CALIBRATION". If I just use "SERIES 50 OHM" termination, then I do not get any errors and everything works properly.

    So it seems something in the /db or /incremental_db folders that is generated from an archive using 13.0.1 is not correct with "SERIES 50 OHM WITH CALIBRATION".

    Jodi