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Computer Architecture: Intro Anatomy of a CPU

Computer Architecture: Intro Anatomy of a CPU. J. Schmalzel S. Mandayam. CPU. MEM. I/O. Hierarchical View of EP and Digital Systems. Operating System HLLs. Computer Architecture. State Machines. Interface Method. Design Techniques. MSI Functions. Boolean Algebra. Gates.

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Computer Architecture: Intro Anatomy of a CPU

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  1. Computer Architecture: Intro Anatomy of a CPU J. Schmalzel S. Mandayam

  2. CPU MEM I/O Hierarchical View of EP and Digital Systems Operating System HLLs Computer Architecture State Machines Interface Method Design Techniques MSI Functions Boolean Algebra Gates

  3. BlockDiagram

  4. Concept of CPU as Two Paths • Data Path • Where data elements flow from/to • Where operations are performed • Control Path • The source of data path control

  5. Dbus RW Register File DA AA Const MB MuxB Aout Dout FS Function Unit Status Din MD MuxD Simple Model Data Path (7-18) n-bit bus Signal BA Dbus

  6. Instruction Word 3 3 3 1 5 1 1 DA AA BA MB FS MD RW

  7. Iword, cont. RW to write back result AA, BA, DA: 3-bit selection field to select 1-of-8 registers RF MB to select source operand for B path FU FS to select operation MD to select source for register file load

  8. Function Select Codes 00000 F=A 00001 F=A+1 00010 F=A+B 00011 F=A+B+1 00100 F=A+ ~B 00101 F= A+ ~B + 1 00110 F=A-1 00111 F=A 01000 F=A & B 01010 F=A | B 01100 F=AB 01110 F= ~A 10000 F=B 10100 F= sr B 11000 F= sl B

  9. FU (ALU) Design Approaches • Complex combinatorial structure • Multiplexed discrete logical and arithmetic units • HDL model

  10. Consider Implementation • Use organization of FS codes to partition system (use FS4 and FS3): • 00- Arithmetic • 01- Logical • 10, 11- Shift, Miscellaneous

  11. Questions, Comments, Discussion

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