Processor

this page covers chapter 4. but some of terms and concepts was already covered in Logic Circuits

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• A single cycle processor is a processor that carries out one instruction in a single clock cycle. (that is $\text{CPI}=1cc/ins$)

• These are the instructions we will implement:

  • R-type instructions: add, sub, and, or, slt
  • I-type instructions: lw, sw, beq
  • J-type instructions: j

1. Fetch
2. Decode
3. Execute
4. Memory
5. Write Back

Logic Design Conventions

• Datapath elements are classified into two types:

  • Combinational elements (e.g. ALU, AND gate)
  • State elements (e.g. Registers, Memory (data, instruction))

• clock methodology: edge-triggered (positive, rising edge)

• nearly all elements are 32-bit wide

• buses are indicated with thicker lines

Datapath