|Master schematic, which shows connections between the chipKIT and all of the layers.|
|Full layer schematic.|
First off, let's look at the Master schematic. The master schematic features 3 distinct sections: the chipKIT, the line drivers, and all of the layers.
Also included are the other 10 signal lines in common with every layer. These lines are located on PORTE. These signals, go to line drivers. We were worried about fanout, so we put each one of these common lines to a line driver. The line drivers chosen were 74LS241. The circuit diagram is shown to the right. Each chipKIT pin drives 2 input lines on the 241's. This in turn drives 2 output pins on the line driver, which controls 12 panels of LEDs and chips.
A small example of the panels appears like the image suggests on the left. This shows the inner 2 rows of panels and the connections it makes with the above 2 images.
Finally, one also must understand the layer schematics. The following 4 photos show how this works.
This schematic reveals how power filtering for each layer will take place. Each layer has a Schottky diode. It also has filtering for high and low frequency noise.