module test; typedef struct packed { logic [9:-1][2:0] a; ///REQ-EXT-10001, REQ-EXT-10004 } ST1; typedef struct { ST1 st1; ST1 st2[2:0]; }ST2; initial begin ST2 st2; st2 = '{2'b01, '{3'b1, 3'b0, 12'b1}}; $display("%", st2); //CHECK-001:'{a:'h1}, st2:'{'a:'h1}, '{a:'h0},'{a:h1}}} end endmodule if I modify ST1 st2[2:0]; to ST1 st2[3:0]; how should I modify the initial value of st2 in initial block?

If you modify the definition of ST2 to have an array of 4 ST1 elements, you can modify the initial value of st2 in the initial block as follows:

ST2 st2;
st2 = '{2'b01, '{4{3'b1}}, '{4{12'b1}}}; // initialize st2 with 2 ST1 elements of 3'b1 and 2 ST1 elements of 12'b1
$display("%", st2); //CHECK-001:'{a:'h1}, st2:'{'a:'h1}, '{a:'h1},'{a:'h1},'{a:h1}}}

This will initialize st2 with 2 ST1 elements of 3'b1 and 2 ST1 elements of 12'b1.

相关问题

module test; typedef struct packed { logic [9:-1][2:0] a; //REQ-EXT-10001, REQ-EXT-10004 }ST1; typedef struct { ST1 st1; ST2 st2[2:0]; }ST2; initial begin ST2 st2; st2='{2'b01, '{3'b1, 3'b0, 12'b1}}; //REQ-EXT-10101 &display("%p", st2); //CHECK-001: '{st1:'{a:'h1}, st2:"{'{a:'h1},'{a:'h0},'{a:'h1}}} end endmodule REQ-EXT-10101处可以如何修改，使得代码仍然可以跑通呢？

在 REQ-EXT-10101 处，可以将赋值语句修改为以下两种方式之一：

1. 使用大括号初始化整个结构体：

st2 = '{ {10'h1}, '{3'b1, 3'b0, 12'h1} };

2. 逐个初始化结构体成员：

st2.st1.a = '{10'h1};
st2.st2[0].a = '{3'b1, 3'b0, 12'h1};
st2.st2[1].a = '{3'b1, 3'b0, 12'h1};
st2.st2[2].a = '{3'b1, 3'b0, 12'h1};

修改后的完整代码如下：

module test;
  typedef struct packed {
    logic [9:-1][2:0] a; //REQ-EXT-10001, REQ-EXT-10004
  } ST1;

  typedef struct {
    ST1 st1;
    ST2 st2[2:0];
  } ST2;

  initial begin
    ST2 st2;
    // 使用大括号初始化整个结构体
    st2 = '{ {10'h1}, '{3'b1, 3'b0, 12'h1} };
    $display("%p", st2); //CHECK-001: '{st1:'{a:'h1}, st2:"{'{a:'h1},'{a:'h0},'{a:'h1}}}
  end
endmodule

module test; typedef struct packed { logic [9:-1][2:0] a; ///REQ-EXT-10001, REQ-EXT-10004 } ST1; typedef struct packed { logic [2:0] b; } ST2; typedef struct { ST1 st1; ST2 st2[2:0]; }ST3; initial begin ST2 st2 ='{'{'{a:'h1, st1:'{'{b:'h2}}}, '{a:'h0, st1:'{'{b:'h1}}}, '{a:'h1,st1:'{'{b:h0}}}}; $display("%p", st2); end endmodule seems there is error with the initailization of st2, how should I modify the code so that it can be compiled successfully with vcs?

The initialization of st2 is incorrect. You can modify the code as follows to initialize st2 correctly:

ST2 st2[3] = '{'{3'h2}, '{3'h1}, '{3'h0}};

This initializes st2 as an array of three elements, each element being an instance of ST2 initialized with the values 3'h2, 3'h1, and 3'h0 respectively. Note that the '{' and '}' characters are used for concatenation of elements in the array.