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Simplicity Favors Regularity

Simplicity Favors Regularity. James Tacey. Overview. RISC architecture Only 1 instruction type Multicycle Simplified datapath 2 user-controlled registers. Instruction Architecture. Opcode Reg Dest Address XXXX X XXXXXXXXXXX Every instruction accesses memory

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Simplicity Favors Regularity

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  1. Simplicity Favors Regularity James Tacey

  2. Overview • RISC architecture • Only 1 instruction type • Multicycle • Simplified datapath • 2 user-controlled registers

  3. Instruction Architecture • Opcode RegDest Address • XXXX X XXXXXXXXXXX • Every instruction accesses memory • Regularity of the instructions allows simplicity in datapath and controller • Not every instruction uses every field

  4. Instructions

  5. Process Flow

  6. Datapath

  7. Pros and Cons • Pros: • Simple and effective • Only one type of instruction • Many aspects of traditional datapath are integrated into controller • Cons: • Requires memory access for every instruction • Controller design is more complex

  8. Status • Working • Fully simulated and verified as expected • Downloads successfully to board • Problems • Board does not run as expected • In-System Memory Content Editor causes Quartus II to crash • PC does not increment as expected

  9. Questions?

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