9 - 9-21-06COCO1COMBINATIONAL LOGIC DESIGN...

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Unformatted text preview: 9-21-06COCO1COMBINATIONAL LOGIC DESIGN & PRACTICE(Chapter 6)9-21-06COCO2IC PRODUCTIONAbout $50 billion per year. One plant costs ~ $3 billion, and getting more expensive (200mm300mm wafers)INTEL ~ 80% worldwide (PCs only)AMD ~ 15%IBM, TI, CYPRESS, MOTOROLA, SAMSUNG, HITACHI, SIEMENS, (nearly 1000 wafer fabs worldwide)There are far more fablesschip makers, who outsource to foundries.SEMATECH CONSORTIUM (pre-competitive research)Road map9-21-06COCO3QWERTYDocumentation6.1, 6.29-21-06COCO4horizontalribbonmotionhorizontal& verticalpapermotionTypewriter PrinterkeystrikerimpactT h e q u ic kb r o w n f o xThe quick brown fox(It used to cost about the same as a laptop today!)9-21-06COCO5Evolution of the typewriterkeypapermotionribbonmotionstrikerimpactThe quickbrown foxThe quickbrown foxampElectric typewriterSelectric (golf ball)Add display screenSeparate keyboardand printerIntroduce communication linkanalog: telexdigital: teletype TTYprint wheel print chain with 4 foot wide ribbonnon-impact ink depositionlaser toner, ink jetfan-fold paperauto-feeder9-21-06COCO6Punch cardsKeypunchCard readerVerifierSorterRAM9-21-06COCO7A digital circuit needs more documentationthan a resident alien!Circuit specification (inputs, outputs, and function: what, not how)Block diagram Schematic diagramLogic diagram Bill of Materials ( 1 A02, 3 FG556, .)Timing diagramCircuit description (blah, blah, blah)HDL code9-21-06COCO8Block diagramTypically 4-12 blocks: fewer is trivial, more needs to be decomposedFunctional namesNote bus annotation9-21-06COCO9Function!9-21-06COCO10Schematic diagramsDetails of component inputs, outputs, and interconnectionsReference designatorsPin numbersNames for all signalsPage-to-page connectorsGood documentation saves time for those who review, modify, and test the circuit 9-21-06COCO11Example of a schematic diagram9-21-06COCO12Schematic diagram (everything necessary to build it)9-21-06COCO13Use informative signal labelsNOTw, x, y, z or A1, A2, A3, A4.9-21-06COCO14Standard logic symbols9-21-06COCO15Choose the logic symbol that requires least thinking to understand the circuit9-21-06COCO16The name of the signal should tell whether it does its thing when it is high or low9-21-06...
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9 - 9-21-06COCO1COMBINATIONAL LOGIC DESIGN...

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