What is the difference between == and === in SV?

What is the difference between == and === in SV?

== can be synthesized into a hardware (x-nor gate), but === can’t be synthesized as x is not a valid logic level in digital, it is infact having voltages in between 0 and 1. And z is not itself any logic, it shows disconnection of the circuit.

What are 4 values in Verilog?

Verilog provides 4 basic values, a) 0 — logic zero or false condition b) 1 — logic one, or true condition c) x — unknown/undefined logic value. Only for physical data types. d) z — high-impedance/floating state.

How do you represent numbers in Verilog?

Numbers in Verilog You can specify constant numbers in decimal, hexadecimal, octal, or binary format. Negative numbers are represented in 2’s complement form. When used in a number, the question mark (?) character is the Verilog alternative for the z character.

What is bit Select in Verilog?

Description. The bit-select can be used to access individual bits of vector net or register data types. The bits can be addressed by using an expression. If the expression value is out of bounds or it returns z or x values, then the value returned by the reference is x.

What is == in Verilog?

In Verilog: == tests logical equality (tests for 1 and 0, all other will result in x) === tests 4-state logical equality (tests for 1, 0, z and x)

What does {} mean in Verilog?

As Matt said, the curly braces are for concatenation. The extra curly braces around 16{a[15]} are the replication operator. They are described in the IEEE Standard for Verilog document (Std 1364-2005), section “5.1. 14 Concatenations”. {16{a[15]}}

How many bits of input does the module gen2 have?

4-bit
The module will have two 4-bit input ports and one 5-bit output port. It will call the function. 2-1-3. Simulate the design with the provided add_two_values_function_tb.

What is Z in Verilog?

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 1 mean in Verilog?

‘1 really means fill the context of the expression with all one’s.

What is module instantiation in Verilog?

When a module is invoked, Verilog creates a unique object from the template. Each object has its own name, variables, parameters, and I/O interface. The process of creating objects from a module template is called instantiation, and the objects are called instances.

What is assign in Verilog?

Assign statements are used to drive values on the net. This concept is realized by the assign statement where any wire or other similar wire (data-types) can be driven continuously with a value. The value can either be a constant or an expression comprising of a group of signals.