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The symbols listed below have predefined meanings in AHDL. The following list includes symbols that are used as operators and comparators in Boolean expressions and as operators in arithmetic expressions.
| Symbol: | Function: | |
|---|---|---|
_ | 
    (underscore) | Acts as user-defined, legal characters in symbolic names. (See Quoted & Unquoted Names for more information.) | 
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  | 
	
     
       (dash) (forward slash) (two dashes)  | 	
     
           Starts a VHDL-style comment, which extends to the end of the line. (See Comments & Documentation for more information.)  | 
  
% | 
    (percent) | Encloses AHDL-style comments. (See "Comments & Documentation" for more information.) | 
( ) | 
	
    (left & right parentheses) |  
      
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[ ] | 
	
    (left & right brackets) |  
      
  | 
  
' ' | 
	
    (single quotation marks) | Enclose quoted symbolic names. (See "Quoted & Unquoted Names" for more information.) | 
" " | 
	
    (double quotation marks) |  
      
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. | 
	
    (period) |  
      
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.. | 
	
    (ellipsis) | Separates the MSB from the LSB in ranges. | 
; | 
	
    (semicolon) | Ends AHDL statements and sections. | 
, | 
	
    (comma) | Separates members of sequential groups and lists. | 
: | 
	
    (colon) | Separates symbolic names from types in declarations. | 
= | 
	
    (equals) |  
      
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=> | 
	
    (arrow) |  
      
  | 
  
+ | 
	
    (plus) | Addition operator | 
- | 
	
    (minus) | Subtraction operator | 
== | 
	
    (two equal signs) | Numeric or string equality operator | 
! | 
	
    (exclamation point) | NOT operator | 
!= | 
	
    (exclamation equals) | Not equal to operator | 
> | 
	
    (greater than) | Greater than comparator | 
>= | 
	
    (greater than equals) | Greater than or equal to comparator | 
< | 
	
    (less than) | Less than comparator | 
<= | 
	
    (less than equals) | Less than or equal to comparator | 
& | 
	
    (ampersand) | AND operator | 
!& | 
	
    (exclamation ampersand) | NAND operator | 
$ | 
	
    (dollar sign) | XOR operator | 
!$ | 
	
    (exclamation dollar) | XNOR operator | 
# | 
	
    (pound sign) | OR operator | 
!# | 
	
    (exclamation pound) | NOR operator | 
? | 
	
    (question mark) | Ternary operator | 
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