a. 两态变量:bit, byte: 8bit, shortint: 16bit, int: 32bit, longint: 64bit, shortreal相当于c的float: 占32bit的内存空间, real相当于c的double: 占64 bit内存空间。其中只有bit是无符号。 b. 四态变量:reg, logic, integer: 32bit有符号, time: 64bit。其中
bit、byte、int、shortint、longint(除bit外均有无符号类型)。 特点:性能更好,节省内存,用以模拟计算机验证的环境,X,Z默认为0。 2. 四值逻辑 logic、integer、reg、wire(除integer外均为无符号类型),模拟外部世界。 其中logic为拓展传统reg类型,也可像wire类型一样进行连线,使得在验证过程中不需过多考虑对应逻...
(计算机的存储模型只有0,1两个状态,如果数据类型是四状态(像reg类型)每一位(bit)都有0,1,x,z四个状态,这样每一bit的数据所占的存储空间就是2bit),例如整数类型,integer和int都表示32bit有符号整数,但因integer是四状态,int是双状态,所以同一个整数变量,integer类型比int类型的变量占用内存多一倍。 module ...
ncsim> run Size s_byte=8, u_byte=8 [0 ns] s_byte=0 u_byte=0 [1 ns] s_byte=127 u...
• Special system functions for working with arrays • The $bits “sizeof” system function 5.1 Structures Design data often has logical groups of signals, such as all the control signals for a bus protocol, or all the signals used within a state controller. The Verilog language does not...
3.15 $cast动态强制类型转换3.16 位流强制类型转换第四章 数组4.1 简介(一般信息)4.2 压缩与非压缩数组4.3 多维数组4.4 数组的索引与分片4.5 数组查询函数4.6 动态数组4.6.1 new[]4.6.2 size()4.6.3 delete()4.7 数组赋值4.8 将数组作为自变量4.9 联合数组4.9.1 通配符索引类型4.9.2 字符串索引4.9.3 类索引...
logic myArray[ integer ]; typedef bit signed [7:0] mByte; int myArray [mByte]; //'bit signed' index 比较特别的是以class作为索引类型的联合数组。 module assoc_arr; class AB; int a; int b; endclass int arr[AB]; //Associative array 'arr' with class 'AB' as index ...
1 parameter int MEM_SIZE = 256; 2 parameter int ADDR_WIDTH = $clog2(MEM_SIZE); // $clog2(256) = 8 3 bit [15:0] mem[MEM_SIZE]; 4 bit [ADDR_WIDTH-1:0] addr; // [7:0] SystemVerilog 芯片验证 2024 年 3 月 21 日 26 / 64 数组 压缩数组 压缩(packed)数组,灵活访问连续...
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/C1"Keywords" alias always always_comb always_ff always_latch and assert assign assume automatic before begin bind bins binsof bit break buf bufif0 bufif1 byte case casex casez cell chandle class clocking cmos config const constraint context continue cover covergroup coverpoint cross deassign default...