C

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Advice and Solutions for VHDL-AMS Compiler Issues

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• When the ncvhdl compiler encounters a problem while compiling VHDL-AMS entities or architectures, it can return an error message acronym. Try one of the following compiler options to bypass the issue.
  • For the following error message
    ncvhdl_p: *E,SSTNTQ
    try the following compiler option
    ncvhdl -relax
  • For the following error message
    ncvhdl_p: *E,SCSUMM
    try the following compiler option
    ncvhdl -nosolvecheck
  • For problems with VHDL compilation order rules, try the -SMARTORDER option.
• Case Sensitivity Issues
  While VHDL-AMS is case-insensitive, the DFII 5X library database is case sensitive. For new cells and new models, use primarily lower case characters for the cell name, entity names, generic names, port names and architecture names.
  The IUS583 release introduces the ncvhdl -keepcase4use5x option. This option forces the ncvhdl compiler to retain case sensitivity during compilation. The -use5xkeepcase option keeps the case as for a VHDL cell name in a 5X library.
  For example, see the following Mixed_case cell in VHDL code.

  entity Mixed_case 

   ...

  end entity Mixed_case; 

  This code creates a Mixed_case cell instead of a mixed_case cell in a 5X library database.
  In addition, there is a UNIX environment variable named CDS_ALT_NMP. When you set it to MATCH

  setenv CDS_ALT_NMP MATCH 

  then AMS-D in HED and AMS-D in ADE compile using the command

  ncvhdl -specificunit Abc 

  instead of

  ncvhdl -specificunit \Abc\ 

  In case you have case-sensitive cell name matching with the entity name, you should set: the UNIX “setenv CDS_ALT_NMP MATCH” variable and use the ncvhdl option “-keepcase4use5x”.

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