Code Questions on Data Types

1. What is the value of y in binary format in below snippet?

reg [5:0] y;
initial begin
    y = 'Ox2;
end

Ans: y = X

2. What us the value of b in the below snippet?

integer b;
initial begin
    b = - 'd12/3;
end

Ans: 1431655761

3. What value is passed across the port b in the below snippet?

module test(output [32:0] b);
    real  a = 14.5;
    assign b = a;
endmodule

Ans: 15

4. Find the value of the variab;e t at 1ns & 20ns respectively from the below snippet?

time t;
initial begin
    #10 t = $time;
    #20;
end

Ans:

At 0ns t = x.

At 20 ns t = 10.

5. Write an RTL snippet to initialize all the locations of an array of size: 10 x 8 to 0 at 0ms. Depth = 10, width = 8 bits.
Ans:

input [7:0] array [9:0];

6. What will be the value of parameter constant for the instance DUT in the top module from the below snippet?

module test;
    parameter WIDTH = 8;
endmodule

module top;
    test #(16) DUT();
endmodule

Ans: 16

7. What is the bug in the following snippet?

module test;
    parameter WIDTH = 8;
endmodule

module top;
    test DUT();
    initial 
        defparam DUT.WIDTH = 10;
endmodule

Ans: bug is initial so remove it. correct code

module top;
    test DUT();
    defparam DUT.WIDTH = 10;
endmodule

8. What will be displayed in the console mode for the below snippet?

reg [13*8:1]s;
initial begin
    s = "riscv core";
    $display("Value = %s, s[104:65]);
end

Ans: riscv

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