How Do Computers Remember?

Overview

Objectives/Goals I wanted to learn how computer memory works, and to build basic computer memory myself. Specifically, I wanted to find a way to make the binary logic to remember a single digit number. I had previously learned that basic computer memory is made up of binary logic called Flip-Flops, so I decided to try to use Flip-Flops to build my basic memory. Methods/Materials 1. I researched the binary logic for computer memory and flip flops. 2. I chose a D Flip-Flop as the logic design for my experiment. 3. I rewired my BCD to 7-segment display project from last year to make it more simple. 4. I tested the display and noted that as soon as I changed the input switches, the output LED changed without any delay. 5. I added logic for 4 D flip-flops and a clock between the input switches and the inputs of the BCD to 7-segment decoder. 6. I added a push button switch to trigger the clock. 7. I tested the logic again and finalized the logic diagrams and schematics. Results With the D Flip-Flop logic between the input switches and the inputs of the BCD to 7-segment decoder, I observed that, even if I changed the switches, the LED display "remembered" the last number input until I pressed the clock switch to clock the flip-flops. Conclusions/Discussion I fould that D Flip-Flop logic could be used to make a single bit of basic computer memory and that using four of these Flip-Flops and my BCD to 7-segment decoder and disply, my project could "remember" a number until I pressed the clock button.

Competition history

• CSEF 2011 Electronics & Electromagnetics · Entry J0912

Resources

• CSEF project summary ↗

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