I was reading about System on Chip on wikipedia and I was wondering
Is the iPhone an example of this? Is the system saved on a processor? How is the system actually put on the device? Thanks!
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Instead of "System on a Chip", think instead of "PCB on a Chip".
Consider if you wanted a system with an audio codec, a 1MB SRAM, a microcontroller, an Ethernet connection, a USB connection, an ADC, and a DAC. Normally you would have to design a PCB for this, route all the connections, probably need six or eight layers (depending on size and stackup).
The SoC would just combine all those discrete chips into one monolithic "System" on a chip. This simplifies board design, since you don't have to route all those connections on the PCB. It also reduces component count (no need for series terminating resistors, probably fewer bypass caps, etc). It also reduces component size, since one SoC will be physically smaller than the sum of individual chips.
Software runs on an SoC like pretty much anything else. Software gets written and compiled to target the SoC's instruction set architecture, the compiled machine code gets loaded into memory, and the SoC does its fetch-decode-execute thing.
No, and iPhone has many chips. However one of them that includes the ARM processor and some peripherals (clock generation, USB port, memory controller, for example) would be.
I see you tagged this PSOC. That's a particular brand of SoC.