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The Designer’s Guide to VHDL, Third Edition by Peter Ashenden

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Appendix A. Standard Packages

The package declarations for the IEEE standard packages described in this book are listed in this appendix.[1] The IEEE standard also includes package bodies defining the detailed meaning of each of the operators and functions provided by the packages. However, simulator vendors are allowed to substitute accelerated implementations of the packages rather than compiling the package bodies into simulations. The IEEE standard requires the packages standard, env, and textio to be in a library called std, and the remaining packages to be in a library named ieee.

The Predefined Package standard

The predefined types, subtypes and functions of VHDL are defined in the package standard. Each design unit in a design is automatically ...

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