COMPUTER SCIENCE
PAPER 1
,1.1 systems architecture
• Architecture of the CPU
• CPU performance
• Embedded systems
, 1.1.1 purpose of the CPU
• Enact Fetch-Decode-Execute Cycle
• Process instructions
• Control other components of the computer
• FDE
• Fetch- PC holds next instruction, address loaded into MAR, address bu
points to instruction in RAM, instruction copied from RAM to data bus a
data bus to MDR
• Decode- load instruction, set PC with next address
• Execute- carries out instructions, clock increments
PAPER 1
,1.1 systems architecture
• Architecture of the CPU
• CPU performance
• Embedded systems
, 1.1.1 purpose of the CPU
• Enact Fetch-Decode-Execute Cycle
• Process instructions
• Control other components of the computer
• FDE
• Fetch- PC holds next instruction, address loaded into MAR, address bu
points to instruction in RAM, instruction copied from RAM to data bus a
data bus to MDR
• Decode- load instruction, set PC with next address
• Execute- carries out instructions, clock increments
