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Altera_Forum's avatar
Altera_Forum
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17 years ago

Quartus error

Hi all.

I make SignalTap II File(stp1.stp).

Add instances to the signalTap II file and nodes to each instance.

Compile the design. But i meet follow error message.

Internal Error: Sub-system: CUT, File: /quartus/db/cut/cut_atom_io.cpp, Line: 4827

buffer_out_oterm->has_fanout_exactly(1)

Stack Trace:

0x37789 : CUT_ATOM_IO::is_pseudo_differential_output_buffer_of_polarity + 0x79 (db_cut)

End-trace

Quartus II Version 8.0 Build 231 07/10/2008 SJ Full Version

Service Pack Installed: 1

Please help me.

2 Replies

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

    Whenever you get an internal error, file a service request at https://mysupport.altera.com/. Provide the Quartus project that produces the internal error and instructions that will enable an applications engineer to reproduce it.

    The cause of an internal error could be a bug in Quartus or something you did wrong for which Quartus doesn't have a more graceful error message.
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    17 years ago

    You're probably tapping a top-level bidir or output pin when compiling for a device family that's Cyclone III or Stratix III. Try disabling Incremental Compilation in the Settings menu. The problem should go away.

    Your other options. Don't tap the pin directly. For a bidir, you can tap the ibuf in the post-fit netlist. It usually has the name <pin_name>~ibuf. For an output pin, you can tap whatever feeds the obuf, which usually has the name <pin_name>~obuf. Look at the post-fitting technology map viewer to see the fanin/fanout connections for the pin.