What is parameter in Verilog?

What is parameter in Verilog?

A parameter is an attribute of a Verilog HDL module that can be altered for each instantiation of the module. These attributes represent constants, and are often used to define variable width and delay value.

How do you pass a parameter to a function in Verilog?

virtual class myClass#(parameter LOCAL_PARAM); static function [LOCAL_PARAM:0] my_function; input [LOCAL_PARAM:0] data; begin my_function = data[LOCAL_PARAM:0]; end endfunction endclass assign foo = myClass#(MY_PARAM)::my_function(bar);

How do you write a parameter in Verilog?

In Verilog, there are two methods to override a module parameter value during a module instantiation….In the new ANSI style of Verilog port declaration, we may declare parameters such as:

  1. module design_ip.
  2. #(parameter BUS_WIDTH=32,
  3. parameter DATA_WIDTH=64)
  4. (input [BUS_WIDTH-1:0] addr,
  5. // other port declarations.
  6. );

What is parameter overriding and why it is needed in Verilog?

We can override the default values, either using defparam or by passing a new set of parameters during instantiation. We call this parameter overriding. A parameter is defined by Verilog as a constant value declared within the module structure.

What is instantiation in verilog?

The process of creating objects from a module template is called instantiation, and the objects are called instances. Each instance is a complete, independent and concurrently active copy of a module. A module can be instantiated in another module thus creating hierarchy.

What is the difference between parameter and define in verilog?

verilog define parameter `define is a macro. You use it in the same way that you use macros in C language. A parameter, on the other hand, will become a membor of your module. Imagin you write a code for a generic adder with a WIDTH parameter as the width of its input/output ports.

What is parameter overriding in verilog?

Overriding parameters The first part instantiates the module called design_ip by the name d0 where new parameters are passed in within #( ) . The second part uses a Verilog construct called defparam to set the new parameter values. The first method is the most commonly used way to pass new parameters in RTL designs.

What is reg in verilog?

reg is a memory element (flip-flop or latch) but for practical purpose, a verilog signal/identifier needs to be declared as “reg” when it is used on the left hand side (LHS) of the equatiion inside a behavioral verilog statement i.e. used in “initial” or “always” statement.

What is the difference between Localparam and parameter in verilog?

2): Verilog HDL local parameters are identical to parameters except that they cannot directly be modified by defparam statements or module instance parameter value assignments.

What is parameter overriding?

Providing values for parameters through Test Cases is the most common approach. When you provide value for a parameter in a test case, you are data-driving that parameter. Each test case may specify a different value for this parameter.

What is the difference between parameter and define in Verilog?

What means instantiation?

noun. the act or an instance of instantiating. the representation of (an abstraction) by a concrete example. logic. the process of deriving an individual statement from a general one by replacing the variable with a name or other referring expression.

What is the difference of parameter and define in Verilog?

Define in verilog is used to write MACRO’s whereas parameter is used where you want to use constant or you want to make some parameter parametarizable!

How to use assign in Verilog?

Verilog assign statement Assign Syntax. The assignment syntax starts with the keyword assign followed by the signal name which can be either a single signal or a concatenation of different signal nets. Assign reg variables. It is illegal to drive or assign reg type variables with an assign statement. Implicit Continuous Assignment. Combinational Logic Design.

What is the use of Verilog?

Verilog is a HDL (Hardware Description Language). It is used to model and simulate digital electronic circuits. Once a design is simulated, tested and ready for ‘tape-out’ to the fab, it can be synthesized to produce gate level designs that are then translated to physical design.