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VHDL handbook

Contents

Contents

LexicaL eLements ............................................................. 4
Definition ................................................................................................4 Character set ...........................................................................................4 Separators...............................................................................................4 Delimiters ...............................................................................................4 Identifiers ................................................................................................4 Numerical literals....................................................................................5 Enumeration literals................................................................................5 String literals...........................................................................................5 Bit string literals .....................................................................................5 The NULL literal ....................................................................................5LiteraLs .................................................................................. 5

reserved words ................................................................. 6 syntax ...................................................................................... 7
Standards.................................................................................................7 TheBackus-Naur-format ........................................................................7 Predefined types ......................................................................................8 Predefined subtypes ................................................................................8 Types and subtypes .................................................................................9ARRAY.................................................................................................10 RECORD ..............................................................................................11 ACCESS TYPES (pointers) .................................................................12 Aggregates ............................................................................................13 GROUP.................................................................................................14 ATTRIBUTE.........................................................................................15 Constant declaration .............................................................................16 Variable declaration..............................................................................17 Signal declaration .................................................................................18 File declaration/File handling ...............................................................19 File reading (TEXTIO) .........................................................................20 File writing (TEXTIO) .........................................................................21ALIAS...................................................................................................22 LIBRARY and USE ..............................................................................23 PACKAGE DECLARATION ...............................................................24 PACKAGE BODY................................................................................25 ENTITY................................................................................................26 ARCHITECTURE ................................................................................27 CONFIGURATION ..............................................................................28 WAIT ....................................................................................................29 IF...
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