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VHDL Tutorial |
Character types in VHDL | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Introduction Fundamental concepts Modelling concepts Elements of behaviour Elements of structure Analysis elaboration Lexical elements Identifiers Numbers Characters and strings Syntax descriptions Constants and variables Scalar type Integer types Floating point types Time type Enumeration types Character types Boolean type Bits type Standard logic Sequential statements Case statements Loop and exit statements Assertion statements Array types & array operations Architecture bodies Entity declarations Behavioral descriptions Wait statements Delta delays Process statements Conditional signal assignment Selected signal assigment Structural descriptions Library and library clauses Procedures Procedure parameters Signal parameters Default values Unconstrained array parameter Functions Package declarations and bodies Subprograms in package Use clauses Resolved signals and subtypes Resolved signals and ports Parameterizing behavior Parameterizing structure
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. Characters
The predefined enumeration type character includes all of the characters in the ISO 8859 Latin-1 8-bit character set. The type definition is shown in Figure 3-2. It con- taining a mixture of identifiers (for control characters) and character literals (for graph- ic characters). The character at position 160 is a non-breaking space character, distinct from the ordinary space character, and the character at position 173 is a soft hyphen.
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type character is (
Characters
The predefined enumeration type character includes all of the characters in the ISO 8859 Latin-1 8-bit character set. The type definition is shown in Figure 3-2. It con- taining a mixture of identifiers (for control characters) and character literals (for graph- ic characters). The character at position 160 is a non-breaking space character, distinct from the ordinary space character, and the character at position 173 is a soft hyphen.
type character is (
The definition of the predefined enumeration type character.
variable cmd_char, terminator : character;
and then make the assignments
cmd_char := 'P'; terminator := cr;
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