verilog display
时间: 2023-10-17 15:27:36 浏览: 57
Verilog does not have a built-in display statement, but you can use the `$display` or `$monitor` system tasks to output information during simulation.
The `$display` task is used to display messages or variables in the simulation log. It supports formatting similar to the C `printf` function. Here's an example of how to use it:
```verilog
module Example;
reg [7:0] data;
initial begin
data = 8'b01010101;
$display("Data: %b", data);
end
endmodule
```
The above code will display the value of `data` as a binary number in the simulation log.
On the other hand, the `$monitor` task continuously displays the specified variables whenever their values change. Here's an example:
```verilog
module Example;
reg [7:0] data;
initial begin
data = 8'b01010101;
$monitor("Data: %b", data);
#10 data = 8'b10101010;
#10 data = 8'b11001100;
#10 $finish;
end
endmodule
```
In this code, the value of `data` will be displayed whenever it changes. After changing it twice, the simulation will finish.
These system tasks are useful for debugging and observing simulation behavior. Remember to use them within initial or always blocks in your Verilog code.