Recursion in Verilog
Verilog supports recursive modules, although they are not commonly used due to the hardware-oriented nature of the language. Here’s an example demonstrating recursion in Verilog:
This Verilog code demonstrates recursion using two classic examples: factorial and Fibonacci sequence.
The factorial
module calculates the factorial of the input n
. It uses recursion by instantiating itself for n-1
when n
is greater than 1.
The fibonacci
module calculates the nth Fibonacci number. It uses recursion by instantiating itself twice for n-1
and n-2
when n
is 2 or greater.
In the testbench, we instantiate both modules and calculate the factorial and Fibonacci number for n = 7.
Note that while this code demonstrates the concept of recursion in Verilog, it’s important to understand that Verilog is a hardware description language. In real hardware designs, recursive structures are typically unrolled or implemented iteratively for efficiency and practicality.
To run this Verilog code, you would need to use a Verilog simulator such as Icarus Verilog or ModelSim. The output would look something like this:
Remember that in hardware design, recursive algorithms are often replaced with iterative solutions or lookup tables for better performance and resource utilization.