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9 - COMBINATIONAL LOGIC DESIGN PRACTICE(Chapter 6 COCO 1 IC...

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9-21-06 COCO 1 COMBINATIONAL LOGIC DESIGN & PRACTICE (Chapter 6)
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9-21-06 COCO 2 IC PRODUCTION About $50 billion per year. One plant costs ~ $3 billion, and getting more expensive (200mm 300mm wafers) INTEL ~ 80% worldwide (PCs only) AMD ~ 15% IBM, TI, CYPRESS, MOTOROLA, SAMSUNG, HITACHI, SIEMENS, …(nearly 1000 wafer fabs worldwide) There are far more fabless chip makers, who outsource to foundries . SEMATECH CONSORTIUM (pre-competitive research) Road map
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9-21-06 COCO 3 QWERTY Documentation 6.1, 6.2
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9-21-06 COCO 4 horizontal ribbon motion horizontal & vertical paper motion Typewriter Printer key striker impact T h e q u ic k b r o w n f o x… The quick brown fox ( It used to cost about the same as a laptop today! )
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9-21-06 COCO 5 Evolution of the typewriter key paper motion ribbon motion striker impact The quick brown fox The quick brown fox amp Electric typewriter Selectric (golf ball) Add display screen Separate keyboard and printer Introduce communication link analog: telex digital: teletype TTY print wheel print chain with 4 foot wide ribbon non-impact ink deposition laser – toner, ink jet fan-fold paper auto-feeder
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9-21-06 COCO 6 Punch cards Keypunch Card reader Verifier Sorter RAM
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9-21-06 COCO 7 A digital circuit needs more documentation than a resident alien! Circuit specification (inputs, outputs, and function: what, not how) Block diagram Schematic diagram Logic diagram Bill of Materials ( 1 A02, 3 FG556, ….) Timing diagram Circuit description (blah, blah, blah) HDL code
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9-21-06 COCO 8 Block diagram Typically 4-12 blocks: fewer is trivial, more needs to be decomposed Functional names Note bus annotation
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9-21-06 COCO 9 Function!
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9-21-06 COCO 10 Schematic diagrams Details of component inputs, outputs, and interconnections Reference designators Pin numbers Names for all signals Page-to-page connectors Good documentation saves time for those  who review, modify, and test the circuit  
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9-21-06 COCO 11 Example of a schematic diagram
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9-21-06 COCO 12 Schematic diagram (everything necessary to build it)
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9-21-06 COCO 13 Use informative signal labels NOT w, x, y, z or A1, A2, A3, A4.
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9-21-06 COCO 14 Standard logic symbols
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9-21-06 COCO 15 Choose the logic symbol that requires least thinking to understand the circuit
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9-21-06 COCO 16 The name of the signal should tell whether it does its thing when it is high or low
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