Central Processing Units (CPUs)

The CPUs are also called processors. It is the active part of the computer, which adds numbers, tests numbers, signals I/O devices to activate, and so on. The processor logically comprises two main components: datapath and control, the respective brawn and brain of the processor.

The datapath performs the arithmetic operations, and control tells the datapath, memory, and I/O devices according to the instructions of the program. The figures on the right side shows the components of the Apple iPad 2 A1395.

The figures below show the iPad 2 logic board (main PCB, Printed Circuit Board), the Apple A5 chip, and the processor IC inside the A5 package. The main memory of the iPad 2 includes 512 MB of DRAM inside the A5 package.

The A5 has two identical ARM processors that run at 1 GHz and a PowerVR grahpical processor unit (GPU) with four datapaths. The interfaces to main memory are on the left and bottom side.





      My boss told me to have a good day.    
      So I went home.