"cannot place 2 nodes into a single alm" error message while doing signalProbe

[Altera_Forum]

Hi All, 

 I am getting this "cannot place 2 nodes into a single alm" error message while doing signalProbe. This issue comes to me suddenly, and I have always been able to do signalProbe without issues, using the same Quartus version and on this same project.   I have googled, and found a few related answers posted by Altera. Altera says that this is their tool bug, and will be fixed in future Quartus releases. They also suggests some workaround. I tried the workaround, but still cannot get rid of this issue.  https://www.altera.com/support/support-resources/knowledge-base/solutions/rd08222013_171.html  Does anybody know other possible workarounds? Thanks.  My Quartus version is 13.1.0, Linux 64-bit version.

[Altera_Forum]

I face the same issue. 

It is design dependant unfortunately. I'm trying other synthesis/fitter options to see how I get signal probe working again. If you found anything, let me know. Altera was not able to reproduce at their side with simple test case. Note: I must stick to version 13.1 as further versions of Quartus does not support the stratix III FPGA anymore.

[Altera_Forum]

Interesting, I got signal probe working again by changing this option in the more fitter settings: 

auto packet registers, changed from normal into off.  The QSF entry for stratix 3 is this: set_global_assignment -name AUTO_PACKED_REGISTERS_STRATIXII OFF  Which is a bit strange as it points to stratix 2 ..

[Altera_Forum]

BTW, the issue came back again on the next synthesis. 

I think the issue was solved by actually deleting the  signalprobe_qsf.tcl file as well before running a new synthesis.

[Altera_Forum]

Deleting files was not helping. 

Adding that and I can signal probe again..  set_global_assignment -name ROUTER_LCELL_INSERTION_AND_LOGIC_DUPLICATION OFF set_global_assignment -name SEED 10