Processor

Processor

1. FDE

   • Fetch
     • CIR
     • PC
     • MAR
     • Main storage
     • MBR
     • CIR
   • Decode
     • CIR
       • Opcode
       • Operand
         • Type
         • Hardware needed
     • Passed to registers
     • More data fetched?
   • Execute
     • ALU?
     • Storage of result
       • Accumulator
       • General purpose register
       • Memory

2. Low-level language

   • Assembly language
     • Mnemonic
       • Instruction
         • LDA
         • STO
         • ADD
         • CMP
         • BLT
         • BGT
         • JMP
         • HLT
         • B
     • Decimal/Hexadecimal
     • Rd
     • <memory ref>
     • Rn
     • <operand>
     • <condition>
     • <label>
     • #
     • Source code
       • Assembler
         • Assembly language instruction
         • Machine code instruction
           • Object code
   • Machine code
     • Instruction set

3. Busses

   • Address
     • Words
     • Width
       • Max capacity of memory system
   • Bi-directional
     • Data
       • Width
         • Determines how many times access is needed
     • Control