SOME COMPACT 7 TARGET BOARDS
Many embedded systems are implemented as a SOC or SOM. A SOC is a System on a Chip where the CPU and most of the chipset for the CPU are all on the same substrate. (See Figure 31-5 for an example of a SOC.) A board that uses a SOC can be a lot smaller than one that is not. A SOM is a System on a Module. It implements the main parts of a Single Board Computer (SBC) on a smaller board, which then plugs into a board that implements the I/O connectivity. SOMs simplify system development further because only the I/O has to be implemented.