VHDL VITAL SDF
VHDL SDF annotation works on VITAL cells only. The IEEE 1076.4 VITAL ASIC Modeling Specification describes how cells must be written to support SDF annotation. Once again, the designer does not need to know the details of this specification because the library provider has already written the VITAL cells and tools that create compatible SDF files. However, the following summary may help you understand simulator error messages. For additional VITAL specification information, see "Obtaining the VITAL specification and source code" .
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