首先说一下SystemVerilog中标量和向量的区别 声明为reg、logic或bit(或匹配的用户定义类型或隐式为逻辑)而没有范围规范的数据对象应被视为1位宽,并被称为标量。 这些类型之一的多位数据对象应通过指定一个范围来声明,称为向量。向量是标量的压缩数组。 11.5.1 Vector bit-select and part-select addressing 位
范围声明形式为 [最高有效比特位:最低有效比特位]。 向量的声明,位选(bit select)以及部分选择(多位选择)一直是Verilog的一部分,并且可综合。Verilog-2001标准新增了对变量的部分选择(part select),同样也可综合。 SystemVerilog标准会将向量推断为压缩数组(packed array),以表示向量代表一个连续存储的bit数组。Syst...
一个常量或变量的表达式可以是一个节选的下标。如果一个节选(part-select)的下标超出了其界限范围,那么该变量的引用值返回一个值x。 例:如果一个8位字vect_word存有一个十进制值4,那么vect_word[2]的值为1,vect_word[3:0]的值为4,vect_word[5:1]的值为2,及vect_word[7:0] = 0000_0100,而vect_wo...
5. part select操作符: +:a_vect[ o+: 8] = a_vect[0:7] -: a_vect[15-:8] = a_vect[8:15] {},可以拼接字符串,和数值。 n{var},表示n个var拼接。 Assignment pattern:'{}来直接赋值。 1) index:value, integer i = ‘{31:1, 23:1,15::1,8:1,default:0 }; int a3[] = '{...
ncvlog: *E,NOPSOM (ShiftRegister.sv,27|28): Part-select or indexed part-select cannot be applied to memory [4.2.2(IEEE)]. module worklib.ShiftRegister:sv errors: 2, warnings: 0 I believe the instruction is correct, so I think this SystemV...
in that an array is a collection of elements that are all the same type and size, whereas a structure is a collection of variables and/or constants that can be different types and sizes. Another difference is that the elements of an array are referenced by an index into the array, wherea...
(item) 将 item 插入到队列最后面 function void delete(index) 删除索引为 index 的元素,不加参数则删除整个队列 SystemVerilog 芯片验证 2024 年 3 月 21 日 40 / 64 数组和队列的块选 数组和队列的块选 1 非索引块选:即 [msb_expr:lsb_expr],对于数组来说,msb_expr 和 lsb_expr 必须是常量整数...
array literals: replicate operator ( {{}} ), index/type keys and default values, e.g., int n[1:2][1:3] = ‘{‘{0,1,2}, ‘{3{4}}}; int m[1,2][1,6] = '{2{'{3{4,5}}}; // same as '{'{4,5,4,5,4,5},'{4,5,4,5,4,5}} typedef int triple [1:3]; ...
The following code shows part of the logic to multiplex the bus master signals in our example design. It uses aforloop with abreakstatement to select the master signals with the highest priority. Note that in SystemVerilog, the loop index variable of aforloop can be declared as part of ...
A global branch history register records the outcomes of the last N branches, which it then combines with (some bits of) the PC to form a history table index. From there, it works the same as the local BHT. By recording the past few branches, this scheme is able to to take advantage...