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

[Altera_Forum]

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.

[Altera_Forum]

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]

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]

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]

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