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VHDL Handbook

vhdl handbookCopyright 1997-2000 HARDI Electronics AB2 ContentsLexicaL eLements ..4 Definition ..4 Character set ..4 Separators ..4 Delimiters ..4 Identifiers ..4 LiteraLs ..5 Numerical literals ..5 String literals ..5 Bit string literals ..5 The NULL literal ..5reserved words ..6syntax .. Backus-Naur-format ..7types and objects ..8 Predefined types ..8 Predefined subtypes ..8 Types and subtypes ..9 ARRAY ..10 RECORD ..11 ACCESS TYPES (pointers) ..12 Aggregates ..13 GROUP .. declaration ..16 Variable declaration ..17 Signal declaration ..18 File declaration/File handling ..19 File reading (TEXTIO) ..20 File writing (TEXTIO) .. and USE ..23design units.

The character set in VHDL’87 is 128 characters, in VHDL’93 it is 256 characters (see page 8, 56). The character set is divided into seven groups – Uppercase letters, Digits, Special characters, The space characters, Lo-wercase letters, Other special characters and format effector. Separators Separators are used to separate lexical elements.

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