Verilog-AMS语言参考手册_Verilogwreal

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Verilog-AMS

Language Reference Manual

Version 2.4.0

May 30, 2014

Accellera

Analog and Mixed-signal Extensions to Verilog HDL Version 2.4.0, May 30, 2014

Accellera Systems Initiative Inc., 1370 Trancas Street #163, Napa, CA 94558, USA

Verilog

is a registered trademark of Cadence Design Systems, Inc.

Notices

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Accellera

Version 2.4.0, May 30, 2014 V

ERILOG-AMS

Table of Contents

1. Verilog-AMS introduction......................................................................................................................... 1

1.1 Overview.......................................................................................................................................... 1

1.2 Mixed-signal language features....................................................................................................... 1

1.3 Systems............................................................................................................................................ 2

1.3.1 Conservative systems.......................................................................................................... 2

1.3.2 Kirchhoff’s Laws ................................................................................................................ 4

1.3.3 Natures, disciplines, and nets.............................................................................................. 5

1.3.4 Signal-flow systems............................................................................................................ 5

1.3.5 Mixed conservative/signal flow systems ............................................................................ 6

1.4 Conventions used in this document ................................................................................................. 8

1.5 Contents ........................................................................................................................................... 9

2. Lexical conventions ................................................................................................................................. 11

2.1 Overview........................................................................................................................................ 11

2.2 Lexical tokens................................................................................................................................ 11

2.3 White space.................................................................................................................................... 11

2.4 Comments...................................................................................................................................... 11

2.5 Operators........................................................................................................................................ 11

2.6 Numbers......................................................................................................................................... 12

2.6.1 Integer constants ............................................................................................................... 13

2.6.2 Real constants ................................................................................................................... 15

2.7 String literals.................................................................................................................................. 16

2.8 Identifiers, keywords, and system names ......................................................................................17

2.8.1 Escaped identifiers............................................................................................................ 17

2.8.2 Keywords .......................................................................................................................... 17

2.8.3 System tasks and functions ............................................................................................... 17

2.8.4 Compiler directives........................................................................................................... 18

2.9 Attributes ....................................................................................................................................... 19

2.9.1 Syntax................................................................................................................................ 20

2.9.2 Standard attributes............................................................................................................. 23

3. Data types ................................................................................................................................................ 24

3.1 Overview........................................................................................................................................ 24

3.2 Integer and real data types ............................................................................................................. 24

3.2.1 Output variables................................................................................................................ 25

3.3 String data type.............................................................................................................................. 25

3.4 Parameters...................................................................................................................................... 27

3.4.1 Type specification............................................................................................................. 28

3.4.2 Value range specification..................................................................................................29

3.4.3 Parameter units and descriptions....................................................................................... 30

3.4.4 Parameter arrays................................................................................................................ 30

3.4.5 Local parameters............................................................................................................... 30

3.4.6 String parameters .............................................................................................................. 31

3.4.7 Parameter aliases............................................................................................................... 31

3.4.8 Multidimensional parameter array examples.................................................................... 32

3.5 Genvars.......................................................................................................................................... 33

3.6 Net_discipline................................................................................................................................ 34

3.6.1 Natures .............................................................................................................................. 34

3.6.2 Disciplines...............................................................................................................

.......... 37

3.6.3 Net discipline declaration.................................................................................................. 41

3.6.4 Ground declaration............................................................................................................ 43

3.6.5 Implicit nets....................................................................................................................... 43

3.7 Real net declarations...................................................................................................................... 44