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Unformatted text preview: L01 - Basics of Information 1 6.004 – Fal 2010 9/9/10 Welcome to 6.004! Handouts: Lecture Slides, Calendar I thought this course was called “Computation Structures” David Macaulay L01 - Basics of Information 2 6.004 – Fal 2010 9/9/10 Course Mechanics Unlike other core courses, you’ll have NO evening quizzes NO final exam NO weekly graded problem sets Instead, you’ll face Repository of tutorial problems (with answers) FOUR quizzes, based on these problems (in Friday sections) EIGHT labs + on-line lab questions + Design Contest (all labs and olqs must be completed to pass!) ALGORITHMIC assignment of your grade! L01 - Basics of Information 3 6.004 – Fal 2010 9/9/10 6.004: Course Clickables 38 36 38-530 Where to find machines and help 34 6.01 lab Announcements, corrections, etc. On-line copies of all handouts Tutorial problems for each lecture Course information, policies, etc. h p://6004.csail.mit.edu/ Current status, access to assignments L01 - Basics of Information 4 6.004 – Fal 2010 9/9/10 How do you build systems with >1G components? Personal Computer: Hardware & Software Circuit Board: ! 1-8 / system 1-2G devices Integrated Circuit: ! 8-16 / PCB .25M-1G devices Module: ! 8-64 / IC .1M-1M devices Cell: ! 1K-10K / Module 16-64 devices Gate: ! 2-16 / Cell 8 devices Scheme for representing information MOSFET L01 - Basics of Information 5 6.004 – Fal 2010 9/9/10 What do we see? • Structure – hierarchical design: – limited complexity at each level – reusable building blocks • What makes a good system design? – “Bang for the buck”: minimal mechanism, maximal function – reliable in a wide range of environments – accommodates future technical improvements • Interfaces – Key elements of system engineering; typically outlive the technologies they interface – Isolate technologies, allow evolution – Major abstraction mechanism Wait! I think I see a bug in the DIV logic. Got that one o ff the web. Sure hope it works. L01 - Basics of Information 6 6.004 – Fal 2010 9/9/10 Our plan of a ack… ! Understand how things work, bo om-up ! Encapsulate our understanding using appropriate abstractions ! Study organizational principles: abstractions, interfaces, APIs. ! Roll up our sleeves and design at each level of hierarchy ! Learn engineering tricks - history - systematic approaches - algorithms - diagnose, fix, and avoid bugs L01 - Basics of Information 7 6.004 – Fal 2010 9/9/10 First up: INFORMATION If we want to design devices to manipulate, communicate and store information then we need to quantify information so we can get a handle on the engineering issues. Goal: good implementations • Easy-to-use • E ffi cient • Reliable • Secure • … • Low-level physical representations • High-level symbols and sequences of symbols Whirlwind, MIT Lincoln Labs http://www.chick.net/wizards/whirlwind.html L01 - Basics of Information 8 6.004 – Fal 2010 9/9/10 What is “Information”?...
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