Today I found Imp – a CPU together with a Wi-Fi module with an antenna included and all packed into the size of an SD card. The specification says nothing about memory and doesn't mention a memory bus.
I always thought that the amount of memory is kind of very important for an embedded system. Okay, maybe there's no memory built in, but then the user would have to add his own memory and that would require a memory bus and the memory bus specification would also be important because it would affect what memory can be used and how fast it would work. Yet neither is mentioned.
Why would the supplier not mention both memory and memory bus in such a module description?
Best Answer
It uses an ARM Cortex-M3 micro-controller with on-chip flash memory and RAM, with no need for external memory.