inti;realr;i=int'(10.0-0.1);// 转换是非强制的r=real'(42);// 转换是非强制的 2.动态转换:$cast函数 2.10 流操作符<<>> 流操作符<<和>>,常结合{}拼接符使用 操作符>>把数据从左到右变成流,操作符<<把数据从右到左变成流。 initialbegininth;bit[7:0]b,g[4],j[4]='{8'ha,8
rand int interval; rand int pkt_len; bit send_over; bit [10:0] data[$]; //constraint range //... extern function new(); extern virtual function string psprintf(string preset = ""); extern virtual function bit compare(pkt_data to); extern virtual function void pack(); extern virtual...
class Vector #(parameter WIDTH=1); bit [WIDTH-1:0] data; endclass 现在,你可以为具有各种宽度的向量的类声明句柄。 Vector v1; // Default: data width=1 Vector #(8) v8; // 8-bit data Vector #(.WIDTH(16)) v16; // 16-bit data initial begin v1 = new(); $display(“v1 “, $...
$cast不仅要检查两个句柄之 间的继承关系,还会检查基类句柄实际指向的对象类型。 SystemVerilog芯片验证2024年3月12日29/120 类的继承句柄类型转换 6moduleautomatictest; 7initialbegin 8trans_atra; 9trans_btrb,tr_ext; 10 11tra=new(1);//创建基类trans_a对象 12if($cast(tr_ext,tra))begin//基类句柄...
realtoshortbit(0.375)→ 32'h3ec0_0000＄cast、＄signed和＄unsigned三个函数在2.8节已有介绍,此处不赘述。2.数学函数＄clog2(x),返回不小于x的以2为底的对数的最小整数。＄ceil(x),返回不小于x的最小整数。＄floor(x),返回不大于x的最大整数。以上三个返回值为整数,以下返回值均为real型。
bit[7:0] dq1[$]; // A queue of 8-bit bytes – unbounded queue string mname[$] = { "Bob" }; // A queue of strings – unbounded queue bit[15:0] dq2[$] = { 3, 2, 7, 1 }; // An initialized queue – unbounded queue ...
//Array that stores 'bit [31:0]' at string type index. bit [31:0] myArray[ string ]; //Array that stores 'string' at string type index. string myArray [ string ]; // Array that stores 'int' at Class type index int myArray [ class ]; ...
(); Packet p; void'( randomize( p.address, p.length, p.payload ) with { p.length > 1 && p.payload.size == p.length; } ); p.chksum = p.payload.xor(); return p; endfunction The byte stream is modeled using a queue, and a bit-stream cast is used to send the packet over...
Casting.SystemVerilog adds the ability to change the type, vector size or “signedness” of a value using a cast operation. To remain backward compatible with the existing Verilog language, casting in SystemVerilog uses a different syntax than C. ...
("State %s=%0d", (), state); 11 state = ; 12 end while (state != ); 13 end 14 endmodule State IDLE = 0 State INIT = 1 State DECODE = 2 SystemVerilog 芯片验证 2024 年 3 月 21 日 58 / 64 枚举 枚举变量和类型转换 枚举变量和类型转换 函数 $cast 尝试将 int 变量 s 赋值给...