CPU

CPU

1. 1.1.1 CPU architecture

   • common CPU components
     • ALU
       • arithmetic logic unit
       • logical decisions
     • CU
       • controls other parts
       • control unit
     • Cache
       • store frequent instructions
     • Registers
       • PC - program counter
         • store next address
       • ACC - accumulator
         • stores ALU output
       • MAR
         • memory address register
         • current memory address
       • MDR
         • memory data register
         • store fetched memory
   • Von Neumann Architecture
     • instructions, data together

2. 1.1.2 CPU performance

   • clock speed
     • more = faster
     • measured in GHz
       • GHz = 1,000,000,000Hz
     • cycles per second
       • fetch decode execute
   • cache size
     • levels
       • 1
         • fastest
       • 2
         • medium speed
       • 3
         • slower speed
     • more = faster
   • number of cores
     • more = faster
     • simultaneous FDE cycles