Studied by 2 people
CPU
Processes simple instructions one at a time
Control Unit
Directs the flow of the data and controls activities taking place within and outside the CPU
Arithmetic Logic Unit
Carries out mathematical calculations AND logic operations (Boolean).
Registers
High speed memory that stores data in the CPU
Cache
Slower to access than registers, but high speed RAM built directly into the CPU that stores frequently used instructions.
Accumulator
Where the arithmetic results are temporarily stored from the ALU
Program Counter
Stores the next instruction that needs to be fetched.
Memory Data Register
Stores the data fetched from memory
Memory Address Register
Stores the address of the current/ next instruction that needs to be fetched.
FETCH STAGE
Memory address is copied from the PC to the MAR
MAR locates address and requires MDR to follow.
Increment PC ready for the next instruction.
DECODE
Instruction in MDR is decoded by the CU.
CU prepares for next stage.
(eg loading values into MAR or MDR)
EXECUTE
Instruction is performed
Von Neumann Architecture
Program instructions and data are stored in the same memory.
Note 
Flashcard (25)