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L05 - CMU 18-447 S'08 L5-1 2008 J C Hoe 18-447 Lecture 5...

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CMU 18-447 S’08 L5-1 © 2008 J. C. Hoe 18-447 Lecture 5: Instruction Set Architecture James C. Hoe Dept of ECE, CMU January 30, 2008 Announcements: Lab 1 due this week HW 1 due next Monday No class on 2/27 Handouts: CMU 18-447 S’08 L5-2 © 2008 J. C. Hoe 18-447: Road Map Computer Architecture ­ how to present precisely the functionality of a computer to a programmer ­ By the same token, this is also the most abstract “design spec” for the hardware guys Computer Organization ­ how to assemble ­ how to evaluate ­ how to tune Computation Structures ­ digital representations ­ processing, storage and I/O elements 15-213 18-240
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CMU 18-447 S’08 L5-3 © 2008 J. C. Hoe I/O Bus (100MB/sec) How to specify what a computer does? CPU ALU RF cache Memory Bus (GB/sec) Main Memory (DRAM) I/O Bridge Disk Video Kbd & Mouse CPU ALU RF cache Net CMU 18-447 S’08 L5-4 © 2008 J. C. Hoe Architecture* “The term architecture is used here to describe the attributes of a system as seen by the programmer, i.e., the conceptual structure and functional behavior, as distinct from the organization of the data flow and controls, the logical design, and the physical implementation.” --- footnote on page 1, Architecture of the IBM System/360, Amdahl, Blaauw and Brooks, 1964.
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CMU 18-447 S’08 L5-5 © 2008 J. C. Hoe How to specify what a computer does? Architectural Level ­ A clock has a hour hand and a minute hand, ..... ­ A computer does ….????…. I know how to read a clock without knowing anything below Implementation Level ­ A particular clock design has a certain set of gears arranged in a certain configuration ­ A particular computer design has a certain datapath and a certain control logic Realization Level ­ Machined alloy gears versus using stamped sheet metal gears ­ CMOS versus ECL versus vacuum tube [Computer Architecture, Blaauw and Brooks, 1997] CMU 18-447 S’08 L5-6 © 2008 J. C. Hoe Stored Program (von Neumann) Architecture stored program ­ instructions in a linear memory array ­ instructions can be modified just like data sequential instruction processing ­ program counter identifies the current instruction ­ instruction is fetched from memory and executed ­ program counter is advanced (according to instruction) ­ repeat Burks, Goldstein, von Neumann, Preliminary discussion of the logical design of an electronic computing instrument,1946.
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CMU 18-447 S’08 L5-7 © 2008 J. C. Hoe von Neumann vs Dataflow Consider a von Neumann program ­ What is the significance of the program order? ­ What is the significance of the storage locations? Instruction ordering specified by dataflow dependence (no program counter!!) ­ each instruction specifies who should receive results ­ an instruction can execute “whenever” all operands are received Which one is more natural?
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