How Do You Represent High Impedance States in Verilog?

[asd1249jf]

High Impedance in Verilog?

Homework Statement

Provide the correct Verilog text for encoding the following numerical values:

A) A 16 bit hexadecimal with all positions in the high impedance state:

B) An unsized hex number BEEF

Homework Equations

Verilog Problem. There is no relavant equation to be used.

The Attempt at a Solution

What the.. I didn't even know a variable can literally be declared as high impedance. I thought high impedance state occurs when the variable is neither off or on.

Also, I thought the variables you declare in verilog MUST be sized.

How are these accomplished?

 

[shuh]

Homework Statement

Provide the correct Verilog text for encoding the following numerical values:

A) A 16 bit hexadecimal with all positions in the high impedance state:

B) An unsized hex number BEEF

Homework Equations

Verilog Problem. There is no relavant equation to be used.

The Attempt at a Solution

What the.. I didn't even know a variable can literally be declared as high impedance. I thought high impedance state occurs when the variable is neither off or on.

Also, I thought the variables you declare in verilog MUST be sized.

How are these accomplished?

You actually can have the states as high-impedance. In your case, it would be

16'h?
or
16'hz

would work.

There is no such thing as unsized hex number. Even if you forget to declare the size, by default, verilog would size it as 32 bit.

 

[piercas]

I can provide some clarification on high impedance in Verilog. In Verilog, high impedance is represented by the letter "z" or "Z". It is used to represent a floating or undefined state, where the value of the variable is not known. This can occur when multiple drivers are trying to drive a signal, or when a signal is not being driven by any driver.

To encode a 16-bit hexadecimal with all positions in the high impedance state, you can use the following Verilog text:

reg [15:0] my_var; // declare a 16-bit register
assign my_var = 16'hz; // assign the value of the register to be all high impedance

To encode an unsized hex number BEEF, you can use the following Verilog text:

reg [3:0] my_var; // declare a 4-bit register
assign my_var = 'hBEEF; // assign the value of the register to be unsized hex number BEEF