CE2 Repo
I made a 2-4 memory address decoder with STRUCTURAL and BEHAVIORAL programming
#Structural
First I made the decoder using structural programming
This means I used different components and connected them together to get a functioning decoder.
The two components in the decoder was a inverter and a three way and gate
The code for the inverter and and3 is above in the repo
Then I created a test bench for the structural decoder
The results are below:
#Behavioral
Next I made the decoder again with the same functionality except using Behavioral programming
The test bench used was the same as the structural test bench except a different VHDL testbench of course...
The simulation for the Behavioral Decoder is below:
As you can see both the simulation were exactly the same
This tells is the first check for consistency and accuracy;
The next test is that it follows the truth table below:
| I0 | I1 | EN | Y0 | Y1 | Y2 | Y3 |
|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 0 | 0 | 1 | 1 | 0 | 0 | 0 |
| 0 | 1 | 0 | 0 | 0 | 0 | 0 |
| 0 | 1 | 1 | 0 | 0 | 1 | 0 |
| 1 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1 | 0 | 1 | 0 | 1 | 0 | 0 |
| 1 | 1 | 0 | 0 | 0 | 0 | 0 |
| 1 | 1 | 1 | 0 | 0 | 0 | 1 |
If you compare the truth table with every line of each simulation you can see that the results match up with the truth table proving that our simulations worked properly Yayyy
Answer to step 15: What the adress decoder does, that we created, is based on some adress input. The decoder will be able to select one "memory" location. Which also somewhat answers the next question, the decoder is used for computer memory! Like I said before each input adress would be used to access a tiny location in the CPU's memory to store that tid bit of informaiton.
#This is the end of my README!!!
##Thanks for Reading!