## 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 –

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.

## 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.