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Why for loop is not synthesizable in Verilog?
Using For Loops in Synthesizable Code They are simply a way of shrinking the amount of code that is written by the hardware designer. They do not loop like a C program loops. They only expand replicated logic. Let’s look at an example of this.
Is generate block synthesizable in Verilog?
In synthesizeable Verilog, it is possible to use an assign statement inside of a generate block. All a generate block does is mimic multiple instants.
Why generate is used in Verilog?
A generate for loop is used to create one or more instances of items that can be placed within a Verilog module. The loop is essentially the same as a regular Verilog HDL for loop, but with these limitations: The index loop variable must be a genvar.
Where do we declare the loop index of a for loop?
Where do we declare the loop index of a FOR LOOP? Explanation: The loop index doesn’t have to be declared because it is always an integer and can be directly used in a loop. So, it is locally declared for a loop. For example, FOR x in 1 TO 10 LOOP; Here ‘x’ is the loop index.
How are Verilog for loops perfectly synthesizable?
Verilog for-loops are perfectly synthesizable under certain conditions: You can use any procedural statement within a loop (e.g. if-else). The number of loops must be predetermined . The limiting expression must be a comparison between the loop variable and either a constant or a parameter.
Can a for loop be used in a synthesizable language?
For loops are one of the most misunderstood parts of any HDL code. For loops can be used in both synthesizable and non-synthesizable code. However for loops perform differently in a software language like C than they do in VHDL.
Can a regular for loop be used in generate?
The regular for loop doesn’t let you do that. Otherwise, in principle, the loop unrolling happens for both (for synthesizable constructs, atleast). Hence, for testbenches it may be more typical to use regular for loops, but for the design modules it may be more typical to use generate for loops.
What can a Verilog generate statement be used for?
Verilog generate statement is a powerful construct for writing configurable, synthesizable RTL. It can be used to create multiple instantiations of modules and code, or conditionally instantiate blocks of code. However, many Verilog programmers often have questions about how to use Verilog generate effectively.