The Specify block was designed to define a delay across a module. It starts with specify and ends with the endspecify keyword. Inside the block the user can specify: specparam declaration, path declaration or system timing check. The syntax of specparam declaration is the same as that of the parameter declaration.
What is specify statement in Verilog?
Description: The specify block describes paths across the module and assigns delays to those paths. It performs also timing checks like setup and hold times. The specify block is declared inside the module declaration.
How do you name a block in Verilog?
Naming of blocks Both sequential and parallel blocks can be named by adding : name_of_block after the keywords begin and fork . By doing so, the block can be referenced in a disable statement.
Which defines special parameters in the specify block?
specparam statements Special parameters can be defined for use within the specify block. They are declared using the specparam keyword. Specify parameters are used only within their specify block, they are not general purpose parameters such as those declared by the parameter keyword.
What is Defparam in Verilog?
For Verilog HDL modules, a Defparam Statement assigns a value to a parameter that is defined in the parameter declaration in the Module Declaration of the module. A Defparam Statement can pass parameters to a design file that is multiple levels below the current design file. For example, if the file top.
Is specify block synthesizable in Verilog?
Typical modern hardware design uses a mix of register-transfer- and gate-level design. It is interesting to note however that the specification of Verilog does not specify which features are synthesizable; that depends on the tooling used.
Is always block synthesizable in Verilog?
Embedded always blocks are not synthesizable. Adding timing delays would not be synthesisable, but often used in verification. Also some tools will complain if you try to synthesise display statements.
What is Defparam used for in Verilog?
What is $clog2 in System Verilog?
The $clog2 system task was added to the SystemVerilog extension to Verilog (IEEE Std 1800-2005). This returns an integer which has the value of the ceiling of the log base 2. The DEPTH need not be a power of 2.
What is the difference between $display and $monitor and $write and strobe?
The only difference between the two is that $display writes out a newline character at the end of the text, whereas $write does not. $strobe prints the text when all simulation events in the current time step have executed. $monitor prints the text whenever one of the signals in the signal list changes.
What is synthesizable and non-synthesizable?
For something to be synthesizable it has to be able to be represented in hardware, i.e. using logic gates. An example of something that is non-synthesizable would be initializing a design with values assigned to signals or registers. This cannot be translated to hardware, therefor is non-synthesizable.
What is the initial block in Verilog?
Verilog initial block A set of Verilog statements are usually executed sequentially in a simulation. These statements are placed inside a procedural block.
What are the different types of Verilog statements?
Verilog has two basic types of statements 1. Concurrent statements (combinational) (things are happening concurrently, ordering does not matter) Gate instantiations. and (z, x, y), or (c, a, b), xor (S, x, y), etc.
How many parameters are bound during static elaboration in Verilog?
6.375 Spring 2006 • L03 Verilog 2 – Design Examples • 6 Parameters are bound during static elaboration creating flexible modules
Which set of Verilog statements are usually executed sequentially in simulation?
A set of Verilog statements are usually executed sequentially in a simulation. These statements are placed inside a procedural block. There are mainly two types of procedural blocks in Verilog – initial and always
