Editing K-map (section)

=== So this is it? ===
Not quite.

Since we can only do 1,2,4 and 8 bit blocks, we have to combine multiple blocks together, to cover all {{On}} outputs. Each one of them has to be part of a block. Overlapping blocks are no problem, they are actually quite helpful to create big blocks for missing bits.

==== Example ====
This is our truth table, that we already plugged into our Karnaugh map:

[[File:KMap_Example4.png]]

Now we have to do blocks of 1,2,4 or 8 (as big as possible) to cover all {{On}} output bits.

We can do it like this:

[[File:KMap_Example9.png]]

We need 3 blocks to cover all bits:

#[[File:YellowBox.png|14px]] A yellow 2-bit block
#[[File:BlueBox.png|14px]] A blue 4-bit block
#[[File:WhiteBox.png|14px]] A white 4-bit block

Combined they look like this:

{| class="truthtable" style="border: 2px solid darkgray; padding: 2px"
|  || [[File:D_boxed.png]] || [[File:C_boxed.png]] || [[File:B_boxed.png]] || [[File:A_boxed.png]]
|-
| [[File:YellowBox.png]] || [[File:Cross_gray.png|24px]] || [[File:On.png|24px]] || [[File:On.png|24px]] || [[File:On.png|24px]]
|-
| [[File:BlueBox.png]] || [[File:On.png|24px]] || [[File:Cross_gray.png|24px]] || [[File:Off.png|24px]] || [[File:Cross_gray.png|24px]]
|-
| [[File:WhiteBox.png]] || [[File:On.png|24px]] || [[File:Cross_gray.png|24px]] || [[File:Cross_gray.png|24px]] || [[File:On.png|24px]]
|}

To build the blocks, we '''AND''' the inputs and after that we '''OR''' the blocks together

[[File:KMap_circuit_combining_blocks.png|640px]]

And that's it! We created a circuit that describes the truth table completely!