What does Z in Verilog mean?

high-impedance state
The SystemVerilog value set consists of the following four basic values: 0—represents a logic zero or a false condition 1—represents a logic one or a true condition x—represents an unknown logic value z—represents a high-impedance state The values 0 and 1 are logical complements of one another.

What does Z mean in modelsim?

Z means the signal is in a high-impedance state also called tri-state.

What is bX in Verilog?

The right side 1’bX is a 1-bit wide literal that has all bits set to X . The operator === compares the sides, including equality of X and Z states. Follow this answer to receive notifications.

What is Z in VHDL?

‘Z’ : High Impedance. ‘W’ : Weak signal, can’t tell if it should be 0 or 1. ‘L’ : Weak signal that should probably go to 0. ‘H’ : Weak signal that should probably go to 1.

What does UU mean in VHDL?

And that is ‘U’, denoting that the signal is uninitialized. The simulation shows real world behaviour here, especially if you synthesize the VHDL code for a standard cell technology. On FPGAs you have sometimes the option to program the initial value of a flip-flop.

What is $monitor in Verilog?

$monitor helps to automatically print out variable or expression values whenever the variable or expression in its argument list changes. It achieves a similar effect of calling $display after every time any of its arguments get updated. A newline is automatically added to the text.

What is Verilog HDL and VHDL?

Definition. Verilog is an HDL used to model electronic systems while VHDL is an HDL used in electronic design automation to describe digital and mixed-signal systems such as field programmable gate arrays and integrated circuits.

What is high Z load?

Hi-Z (or High-Z or high impedance) refers to an output signal state in which the signal is not being driven. The signal is left open, so that another output pin (e.g. elsewhere on a bus) can drive the signal or the signal level can be determined by a passive device (typically, a pull-up resistor).