What is default value of logic in SystemVerilog?

Verilog’s variable types are four-state: each bit is 0,1,X or Z. SystemVerilog introduces new two-state data types, where each bit is 0 or 1 only….Integer and Real Types.

TYPE	Description	Example
logic	identical to reg in every way	logic [7:0] a_byte;
integer	32 bits, signed	integer i, j, k;

What is logic in SystemVerilog?

SystemVerilog introduces a new 4-state data type called logic that can be driven in both procedural blocks and continuous assign statements. But, a signal with more than one driver needs to be declared a net-type such as wire so that SystemVerilog can resolve the final value.

What is the default value of reg in Verilog?

Generally the initial value for the registers is always 0 anyway, and if you choose to have them set to 1, it will basically use bubble pushing optimisations to invert the register value and still use 0 as the initial value (but as far as your logic is concerned it would effectively be 1).

What is the default value of logic?

Default logic is a non-monotonic logic proposed by Raymond Reiter to formalize reasoning with default assumptions. Default logic can express facts like “by default, something is true”; by contrast, standard logic can only express that something is true or that something is false.

Can we use int in Verilog?

Verilog introduces new two-state data types, where each bit is 0 or 1 only. Using two-state variables in RTL models may enable simulators to be more efficient….Integer and Real Data Types.

Types	Description
shortint	16 bits, signed
int	32 bits, signed
longint	64 bits, signed

What is the default value of integer in Verilog?

In systemverilog, a two state int has default value as 0, four state integer has default value as x.

What is the default data type of a variable in the Verilog module?

An integer is general-purpose variables. They are used mainly loops-indices, parameters, and constants. They store data as signed numbers, whereas explicitly declared reg types store them as unsigned. If they hold numbers that are not defined at compile-time, their size will default to 32-bits.

What are the logic terms 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. Only for physical data types.

What is the default value of Reg?

reg is by default a one bit unsigned value. The reg variable data type may have a modifier signed, and may have may bits by using the vector modifier [msb:lsb].

What are the value sets in Verilog?

The value set for Verilog is: 0 – represents number zero, logic zero, logical false 1 – represents number one, logic one, logical true x – represents an unknown logic value z – represents high impedance logic value most data types can store all four values.

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 the values SystemVerilog variables can hold?

Values SystemVerilog variables can hold 0 Logic state 0 – variable/net is at 0 vol 1 Logic state 1 – variable/net is at some x or X Logic state X – variable/net has either z or Z Logic state Z – net has high impedence –

How has SystemVerilog extended Verilog?

Hence SystemVerilog has extended Verilog by adding more C like data-types for better encapsulation and compactness. The image shown below is a comprehensive list of the major basic data types available in SystemVerilog.

What are the data-types in Verilog?

Verilog has reg and wire data-types to describe hardware behavior. Since verification of hardware can become more complex and demanding, datatypes in Verilog are not sufficient to develop efficient testbenches and testcases.