Reserved words

The identifiers listed below are called reserved words and are reserved for significance in fhe language. These words cannot be used as explicit idem tifiefs. VHDL is case insensitive. 

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Pascal names (of units, variables, array elements, etc.), consisting of an initial letter followed by letters or digits, may be as long as needed in standard Pascal however, in practice, most compilers require that a name be unique within a certain number of characters. (See Table 1-28 for reserved words which may not be used as names.)... 

Statements. A Pascal statement may be shorter than or may continue over more than one line, since a semi-colon separates statements. Reserved words are not separated from statements therefore the statement preceding the word END (see later sections) requires no punctuation. END of the main program unit is followed by a period. Comment lines are included in the program by placing them between the symbols ( and ). Statements may be simple (single) or compound, i.e., a series of simple statements joined together in a block which is introduced by BEGIN and completed by END. 

C---OF COURSE, RESERVED WORDS LIKE WRITE, READ, IF, END, OR LIBRARY... 

In all the Verilog HDL descriptions that appear in this book, reserved words are in boldface. Occasionally ellipsis (...) is used in Verilog HDL source to indicate code that is not relevant to that discussion. Certain words such as if and and are written in Courier font so as to indicate their special meaning rather than their English meaning. 

This appendix lists selected VBA keywords (reserved words) for functions, statements, methods and properties. See Excel s On-line Help for a complete list of keywords. 

Visual Basic statements are in Geneva VBA reserved words are bold For Counter = Start To End Step Increment. 

It would make sense to call the array IF, but that s a reserved word in BASIC.) The flags are used to indicate such properties as whether the item can be carried or not. 

A large number of operations and functions commonly used in scientific disciplines are incorporated in the language by means of reserved words in the processor s vocabulary. These include the elementary mathematical and trigonometric functions some special functions such as Bessel functions, the exponential integral, the gamma, complex gamma, and error functions ... 

Comments Matching braces ( ), and all intervening characters, are ignored. Commands Specific words are reserved as commands see below and Table 3. Transfer variable names Reserved words enclosed in parentheses (Table 1). Numbers Some commands expect positive integers (a series of digits). 

An identifier of this type cannot be the same as any of the VHDL reserved words that are listed in Appendix Al. Additionally, many synthesizers may also place restrictions on the use of the following ... 

In case of scoped entities (see "Scope on page 11) the corresponding structure attribute definitions are enclosed by the reserved words SCOPE and END. SCOPE. 

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