370L9 - EECS/CS 370 Basic Processor Design Lecture 9 LC2K1...

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EECS/CS 370 Basic Processor Design Lecture 9
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LC2K1 Processor as FSM Current state Implement transition functions (using a ROM and combinatorial circuits) Inputs Outputs Next state Memory Register file 65,536 × 32 + 9 × 32 bits 65,536 × 32 + 9 × 32 bits Far more bits than atoms in the Universe!
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Pentium Processor Die State Registers Memory Control ROM Combinatorial logic REG
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PC Instruction memory Register file Data memory Control ROM M U X M U X M U X M U X Sign extend + 1 + A L U 3x8 decoder R/W En En Instruction bits 15-0 21-19 18-16 24-22 18-16 2-0 One possible datapath implementation for LC2K1
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PC Instruction memory Register file Data memory M U X M U X M U X M U X Sign extend + 1 + A L U 3x8 decoder add 1 2 3 0 0 1 0 1 0 1 1 1 1 0 0 0 1 1 0 0 0 R/W En En C Executing an ADD instruction on this LC2K1 datapath
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PC Instruction memory Register file Data memory M U X M U X M U X M U X Sign extend + 1 + A L U 3x8 decoder nand 1 2 3 1 1 1 1 1 0 0 0 1 0 1 0 0 1 1 0 0 1 R/W En En C Executing a NAND instruction on this LC2K1 datapath
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