SystemVerilog语法

11 | Presentation Title | December 25, 2018 | AMD SRDC Confidential
Data Types -
User defined types
User defined types are same as found in C language or others. A type can be used before it is defined, provided it is first identified as a type by an empty typedef. Syntax
– can be accessed as pack1.d <= ‘b0;
– the whole struct can be resetted with pack1 <= ‘b0;
• unpacked struct (no “packed” keyword) allow only acces through the named fields (pack1.d <=‘b0);
New features
C type data types like int, typedef, struct, union, enum. Dynamic data types : struct, classes, dynamic queues, dynamic arrays.
New operators and built in methods.
• equivalent to a packed array subdivided into named fields:
– example: 48 bit packed array – can be accessed as pack1[15:0] <= ‘b0; – can access pack1[9:4] <= 15;
dynamic
bit [3:0] nibble[]; integer mem[]; Method new[], size(), delete()
and associative arrays
bit[20:0] array_b[string]; event ev_array[myClass]; Method: num(), delete(); exists()... reduced memory usage, built-in support for searching and sorting
o struct, union, and class data types.
o void data type. o null data type.
o arrays, queue, associative array, dynamic array
4 | Presentation Title | December 25, 2018 | AMD SRDC Confidential
Intro_to_SystemVerilog
Amy Wu 12/2013
1 | Presentation Title | December 25, 2018 | AMD SRDC Confidential
Content
Intro Data Types Processes SystemVerilog Classes SystemVerilog Interfaces SystemVerilog Program Block SystemVerilog Clocking Random Constraints Functional coverage
o typedef data_type type_identifier variable_dimension o typedef interface_instance_identifier type_identifier o typedef [ enum | struct | union | class ] type_identifier
packed : A packed structure consists of bit fields, which
are packed together in memory without gaps. unpacked : An unpacked structure has an
implementation-dependent packing, normally matching
6 | Presentation Title | December 25, 2018 | AMD SRDC Confidential
Data Types -
chandle data types
chandle data type is used for storing the pointer, while using Direct programming
interface(DPI).
7 | Presentation Title | December 25, 2018 | AMD SRDC Confidential
Data Types -
string data types -1
string data type is used for storing strings. the size of string data is dynamic. string data types come with build in methods
8 | Presentation Title | December 25, 2018 | AMD SRDC Confidential
Data Types String Operators
string data types -2
9 | Presentation Title | December 25, 2018 | AMD SRDC Confidential
Enhanced flow control like, foreach, return, break, continue. Semaphores, mailboxes, event extensions. classes for object oriented programming. Assertions. Coverage.
Data Types build in methods
string data types -3
10 | Presentation Title | December 25, 2018 | AMD SRDC Confidential
Data Types -
event data types
Syntax : event variable_name [= initial_value] Initial value can be another event variable, And can be null if you want variable_name to be triggered always.
the C compiler. tagged : An Tagged union is a type-checked union.
13 | Presentation Title | December 25, 2018 | AMD SRDC Confidential
Data Types -
Hale Waihona Puke Structures and unions types
12 | Presentation Title | December 25, 2018 | AMD SRDC Confidential
Data Types found in C language.
Structures and unions types
Structure and union declarations types are same as that
14 | Presentation Title | December 25, 2018 | AMD SRDC Confidential
Data Types - new data types
Queues,
byte q1[$]; // A queue of bytes string names[$] = { "Bob" }; // A queue of strings with one element Method: size(), delete(), pop_front(), pop_back()…..
Data Types -
void and null data values
void and null types value are same as in C language o void is used in functions to return no value. o null is used for comparing a variable to empty value, say comparing a string to empty string.
o reg : User defined vector types.
o wire : User defined vector types.
o integer : 32-bit signed integer.
o time : 64-bit unsigned integer.
o
5 | Presentation Title | December 25, 2018 | AMD SRDC Confidential
15 | Presentation Title | December 25, 2018 | AMD SRDC Confidential