Assessment Details:

In the project, you will implement a counter (modulo 8 and then modulo 16) as a binary model for Xchek and a set of properties. The stages of the project are as follows: 
1. Build a model for the counter modulo 8 with binary variables in GCLang. Keep in mind that you will have to extend your model to a counter modulo 16 with minimum changes to the code. 
2. Write an initial set of CTL properties to check correctness of your model. Argue that the set represents the intuitive specification of what we can expect from the counter. For each property, indicate whether it is a safety property or aliveness property and explain why. 
3.Show that one of your properties passes vacuously in the system; explain the reason for the vacuous pass and fix the model or the property. 
4.Introduce a bug in your model that is not caught by any of the properties. 
5.Explain why this happened and write an additional property that exposes this bug. Demonstrate a counterexample. 
6.Does your initial model satisfy this additional property? If no, explain why not and fix the model. 
7.Extend your model to a counter modulo 16. Your initial design should have been general enough to allow this with a small number of changes. Explain the changes. 
8. Out of the list of the properties you wrote, indicate which ones pass in counter modulo 16 and which fail. If none fail, introduce a new property that distinguishes between the counter modulo 8 and counter modulo 16. 

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  • Posted on : November 27th, 2018

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