Array Constraints: Flip the Index Rules!

Array Constraint Write a constraint for an array of numbers such that the size of array ranges from 6 to 15 elements, and even index locations should have odd numbers and odd index locations should have even numbers, numbers rage is between 16 to 127

In order to address the given constraints for an array, several considerations need to be taken into account:

1. Utilize a dynamic array to accommodate the varying size requirement ranging from 6 to 15 elements.
2. Enforce a condition where even index locations contain odd numbers, while odd index locations contain even numbers.
3. Limit the values within the array to a range between 16 and 127, and accordingly, use a 7-bit variable.

By combining these aspects, the resultant constraint ensures a dynamic array with a size ranging from 6 to 15 elements. Additionally, it maintains a pattern where even index locations store odd numbers, odd index locations store even numbers, and the values fall within the specified range of 16 to 127. The utilization of a 7-bit variable facilitates adherence to the designated value range.


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

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Decoding of the Above Example:

1. Class Definition (sample):The class sample declares a dynamic array named array with 7 bits per element (bit[6:0]). The constraint array_c is defined within the class to impose specific conditions on the array.
2. Constraint (array_c):array.size() inside {[6:15]};: Ensures that the size of the array is within the range of 6 to 15 elements. foreach(array[i]) { … }: Iterates over each element of the array using the foreach loop.array[i] inside {[16:127]};: Constrains each array element to be within the range of 16 to 127. if(i[0]==0) array[i][0] == 1; Specifies that for elements at even indices, the least significant bit ([0]) should be 1. else array[i][0] == 0;: For elements at odd indices, the least significant bit should be 0.
3. Module (top):An instance s of the sample class is created (sample s=new();).The initial block is responsible for executing the simulation.Inside the block, the repeat (5) loop randomizes the array elements and displays the resulting array ($display(“array=%p”,s);).

This program essentially generates and displays instances of the sample class, adhering to the specified constraints. It ensures that the array size falls within the required range, each element is within the specified value range, and the least significant bit pattern alternates based on the index.