URGENT: Error in code for RING OSCILLATOR

[Ravali Attivilli]

https://www.edaplayground.com/x/bQK7

Above is my code for generating a clock signal using NAND and NOT gates only.

So i used a ring oscillator.

I am getting stuck in this please help me understand where I am going wrong.

Ravali 

[Ravali Attivilli]

Just to provide more clarity on the above topic:

My exact question was to: Write verilog code using NAND and NOT gates only to generate  a clock signal of frequency 'f' and dutycule 'd' as per the requirement. (hint:- you can use parameters)

I was also asked to use Ring Oscillator instead of directly assigning the vales to the clock output as 0 or 1 which is why I wrote my code like that.

However when I run my code I get the following error :   Execution interrupted or reached maximum runtime.

Kindly help ASAP.

Regards

[EDA Playground]

I looks like you've sorted this.

Matthew