System Architecture - GCSE Computer Science OCR
- Created by: qazxswedcvf12_3
- Created on: 13-01-19 15:48
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- Chapter 1 - Systems Architecture
- The CPU
- Components
- Registers
- MAR
- Holds address of instruction to be fetched
- About instructions that are being fetched into CPU
- Temporarily holds instructions after being fetched
- About instructions that are being fetched into CPU
- Holds address of instruction to be fetched
- MDR
- Temporarily holds instructions after being fetched
- Inside ALU
- PC
- Holds address of next instruction to be processed
- Counts number of cycles - each function adds 1
- CIR
- Holds current instruction to be executed
- Both about instruction being processed in the CPU
- Holds address of next instruction to be processed
- Both about instruction being processed in the CPU
- Inside CU
- PC
- Counts number of cycles - each function adds 1
- MAR
- Holds address of instruction to be fetched
- About instructions that are being fetched into CPU
- About instructions that are being fetched into CPU
- Holds address of instruction to be fetched
- PC
- Holds current instruction to be executed
- Accumulator
- Stores result of the previous calculation
- Inside ALU
- MAR
- CU
- Controls sequence of execution
- Decodes instrucions
- Regulates pulses and processor timing
- Sends and receives control signals between other hardware
- ALU
- Logical operations
- AND
- OR
- NOT
- Shifting bits left or right by n places
- Arithmetic operations
- Logical operations
- Registers
- Components
- Function of the CPU
- Fetch-Execute Cycle
- Fetch
- CPU requests address of instruction
- MAR holds address from main memory
- MDR holds data from main memory
- Data from MDR transferred to CIR
- PC holds address of the current instruction
- Data from MDR transferred to CIR
- MDR holds data from main memory
- MAR holds address from main memory
- CPU requests address of instruction
- Decode
- CIR's instruction is decoded
- Execute
- Executed
- Fetch
- Fetch-Execute Cycle
- The CPU
- Subchapters
- Overarching ideas
- Key information
- Also key information
- Linking ideas
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