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Enumerations types
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Enumerations types are same as that found in other programming language and same as found in C language. Enumerated data types provide the capability to abstractly declare strongly typed variables without either a data type or data value and later add the required data type and value for designs that require more definition. |
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Enumerated data types also can be easily referenced or displayed using the enumerated names as opposed to the enumerated values. Unlike typedef, enumerated types needs to be declared first before using them. In the absence of a data type declaration, the default data type shall be int. |
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Syntax |
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- enum [ enum_base_type ] { enum_name_declaration { , enum_name_declaration } }
- enum_base_type ::= integer_atom_type [ signing ] | integer_vector_type [ signing ] [ packed_dimension ] | type_identifier [ packed_dimension ]
- enum_name_declaration ::= enum_identifier [ [ integral_number [ : integral_number ] ] ] [ = constant_expression ]
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Example - enum
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1 module enum_data();
2
3 enum integer {IDLE=0, GNT0=1, GNT1=2} state;
4 enum {RED,GREEN,ORANGE} color;
5 enum {BRONZE=4, SILVER, GOLD} medal;
6
7 // a=0, b=7, c=8
8 enum {a, b=7, c} alphabet;
9 // Width declaration
10 enum bit [3:0] {bronze='h1, silver, gold='h5} newMedal;
11 // Using enum in typedef
12 typedef enum { red, green, blue, yellow, white, black } Colors;
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14 Colors Lcolors;
15
16 initial begin
17 state = IDLE;
18 color = RED;
19 medal = BRONZE;
20 alphabet = c;
21 newMedal = silver;
22 Lcolors = yellow;
23 $display (" state = %0d", state);
24 $display (" color = %s", color.name());
25 $display (" medal = %s", medal.name());
26 $display (" alphabet = %s", alphabet.name());
27 $display (" newMedal = %s", newMedal.name());
28 $display (" Lcolors = %s", Lcolors.name());
29 end
30
31 endmodule
You could download file enum_data.sv here
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Simulator Output
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state = 0
color = RED
medal = BRONZE
alphabet = c
newMedal = silver
Lcolors = yellow
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Copyright © 1998-2012 |
Deepak Kumar Tala - All rights reserved |
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Do you have any Comment? mail me at:deepak@asic-world.com
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