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.

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 [2:0] b; ///REQ-EXT-10001, REQ-EXT-10004 } ST4; typedef struct packed { logic [9:-1][2:0] a; ST4 st4[1:0]; } ST3; typedef struct { ST3 st3; ST4 st4; }ST5; typedef struct { ST5 st5; ST2 st2[2:0]; }ST2; initial begin ST2 st2[2:0] = '{'{b:'h2}, '{b:'h1}, '{b:'h0}}; ST3 st3 ='{'{st1:'{'{a:'h1}}, st2}; $display("%p", st3); end endmodule there are several errors in this piece of code, how should I modify it so it can be compiled successfully by vcs?

There are a few errors in this code that need to be corrected:

1. The definition of ST2 is incomplete, so the compiler will not recognize it. You need to define ST2 before using it in the definition of ST5.

2. The initialization of ST2 is incorrect. You need to use curly braces to initialize the ST4 struct, and you need to use a colon to separate the field name from the value.

3. The initialization of ST3 is incorrect. You need to use curly braces to initialize the ST1 struct, and you need to use a colon to separate the field name from the value.

Here is the corrected code:

module test;
    typedef struct packed {
        logic [2:0] b; ///REQ-EXT-10001, REQ-EXT-10004
    } ST4;

    typedef struct packed {
        logic [9:-1][2:0] a;
        ST4 st4[1:0];
    } ST3;

    typedef struct {
        ST3 st3;
        ST4 st4;
    } ST5;

    typedef struct {
        ST5 st5;
        ST4 st2[2:0];
    } ST2;

    initial begin
        ST4 st4_arr[2:0] = '{'{b:'h2}, '{b:'h1}, '{b:'h0}};
        ST2 st2_arr[2:0] = '{'{st4: st4_arr[2]}, '{st4: st4_arr[1]}, '{st4: st4_arr[0]}};
        ST3 st3 ='{st1:{a:'h1}}, st2_arr};
        $display("%p", st3);
    end
endmodule