设计者可通过将结构体声明为压缩式(packed)来管理结构成员的存储方式。压缩结构体会以连续的方式存储所有成员,其中第一个成员存储在最左边(最高有效位most signficant bits)。压缩结构体(packed struct)与压缩共用体(packed union)配合到一起会非常有用(见Section 2.6.3)。 SystemVerilog优点四:通过结构体将相关的...
in a specified order. A packed structure is stored as a vector, with the first member of the structure being the left-most field of the vector. The right-most bit of the last member in the structure is the least
typedef bit [31:0] uint; Using struct and typedef: Use struct along only creates one data of its type. Combine struct and typedef is suitable; initial begin typedef struct {int a; byte b; shortint c; } my_struct_s; my_struct_s st = '{32'haaaaaaaa, 8'hbb, 16'hcccc}; end Pa...
syn keyword systemverilogStatement shortint shortreal showcancelled signed small solve syn keyword systemverilogStatement specify specparamstaticstringstrong0 strong1structsyn keyword systemverilogStatement super supply0 supply1 table tagged taskthissyn keyword systemverilogStatement throughout time timeprecision ...
SystemVerilog在基本数据类型的基础上,引入C/C++语言中构造类型的概念,设计了数组(array)、自定义(typedef)、枚举(enum)、结构体(struct)和联合体(union)等灵活多样的数据类型,以满足不同抽象层次的建模。 1.数组(array) 在VerilogHDL中学习了数组类型的定义及赋值,如“reg[7:0]mem[1:256];”。Verilog中对数组...
bit [2:0]b ='b110; }bit_var; --- Vector access Vector addressing is possible using range(start, end) built in method struct tag { sc_bv<8> var; sc_bv<8>var2; }obj; obj.var.range(5, 0) = 4 Vector access is possible for packed structure Struct packed { short int shr;...
bit E; bit F; bit[9:0] G; bit[1:0] H; bit I; }packed_struct; <line 140> packed_struct [10:0] array_of_structs; I get the following error: Error (10168): SystemVerilog Declaration error at *.v(140): prefix for packed array type does not...
通过typedef创建用户自定义类型 通过enum创建枚举类型 通过struct创建结构体类型 1.5 字符串类型 SV引入string类型用来容纳可变长度的字符串,存储单元为byte,长度为N时,索引值从0到N-1,结尾没有null字符。 str.len():返回字符串的长度 str.putc(i,c):将第i个字符替换成字符c,等同于str[i]=c str.getc(i):...
3、; typedef enum logic UNSIGNED, SIGNED operand_type_t; typedef union packed logic 23 : 0 u_data; logic signed 23 : 0 s_data; data_t; typedef struct packed opcode_t opc; operand_type_t op_type; data_t op_a; data_t op_b; instr_t; endpackage,7.1.2 赋值操作符,import definitio...
typedef struct packed { rv32i_opcode opcode; alu_ops aluop; logic regfilemux_sel; logic load_regfile;/* ... other signals ... */} rv32i_control_word; Listing 2: Example control memory module import rv32i_types::*;modulecontrol_rom(inputrv32i_opcode opcode,/* ... other inputs ...