Count the Number of 1's

Input: 7bit Input
Output: Number of 1's in the input

Available Components: Only Full Adders

Difficulty Level: Easy

Building XOR with alien gates only

There is a shortage of XOR gates. The only logic gates available are “X” and “Y”. The truth table of both components is presented below.

Build an XOR gate using these gates?

About the Digital-VLSI Blog

I am creating 4 labels for all the posts within this blog. All posts in this blog will be categorized as belonging to one among these.

They are

1. Clarify your Query

2. VLSI Interview Experiences

3. Digital VLSI Interview Questions

4. Question of the Day

Let me know if you feel there should be more categories or labels for the posts within this blog.