Systems Architecture

Systems Architecture

1. The Fetch-execute Cycle

   • Fetch
   • Decode
   • Execute

2. CPU Components

   • ALU
   • CU
   • Cache

3. Registers

   • MAR
     • Holds address of data to be fetched or stored
   • MDR
     • Holds data to be fetched from, or to be written to memory
   • ACC
     • Holds the results of calculations
   • PC
     • Holds the address of the next instruction

4. CPU Performance

   • Number of Cores
   • Clock Speed
   • Cache Size

5. Embedded Systems

   • Computer built into a device
   • e.g. Dishwasher, TV