Ch6_1 - COMBINATIONAL LOGIC DESIGN PRACTICE(Chapter 6 Today I/O Documentation Intro to PLA COCO Ch 6 Part I 1 The evolution of I/O COCO Ch 6 Part I

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March 18, 2010 COCO Ch 6, Part I 1 COMBINATIONAL LOGIC (Chapter 6) Today: I/O Documentation Intro to PLA
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March 18, 2010 COCO Ch 6, Part I 2 The evolution of I/O
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March 18, 2010 COCO Ch 6, Part I 3 horizontal ribbon motion horizontal paper motion Typewriter Æ 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! ) QWERTY
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March 18, 2010 COCO Ch 6, Part I 4 Keys Selectric
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March 18, 2010 COCO Ch 6, Part I 5 Æ Printer The quick brown fox The quick brown fox key paper motion ribbon motion striker impact amp 1. Electrify keyboard 2. Separate keyboard from printer 3. Introduce communication link analog: telex digital: teletype (TTY) fan-fold paper auto-feeder
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March 18, 2010 COCO Ch 6, Part I 6 Printers • golf ball • daisy-wheel print wheel • dot matrix (8x5) • thermal printer • print chain with 4 foot wide ribbon • non-impact ink deposition laser (toner) ink jet
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March 18, 2010 COCO Ch 6, Part I 7 IBM 1403 Chain Printer (1959) IBM 3800 Laser Printer (1976)
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March 18, 2010 COCO Ch 6, Part I 8 Punch cards • Keypunch • Card reader • Verifier •S o r t e r
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March 18, 2010 COCO Ch 6, Part I 9 Displays glass teletype 24 lines of IBM 2250 vector current future 80 characters display flat panel 3-D
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March 18, 2010 COCO Ch 6, Part I 10 DOCUMENTATION 6.1, 6.2
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March 18, 2010 COCO Ch 6, Part I 11 A digital system needs more documentation than a legal alien! 1. Circuit specification Front lights cct-brkr off when door or pulpit switch off (inputs, outputs, and function: what , not how) 2. Block diagram 3. Logic diagram 4. Schematic diagram (components) 5. Bill of Materials ( 1 A02, 3 FG556, …. ) 6. Timing diagram 7. Circuit description (blah, blah, blah) 8. HDL code
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March 18, 2010 COCO Ch 6, Part I 12 Block diagram Typically 4-12 blocks: fewer is trivial, more needs to be decomposed Functional names Note bus annotation
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March 18, 2010 COCO Ch 6, Part I 13 Function!
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March 18, 2010 COCO Ch 6, Part I 14 LOGIC DIAGRAM
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March 18, 2010 COCO Ch 6, Part I 15 Example of a schematic diagram
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March 18, 2010 COCO Ch 6, Part I 16 Schematic diagrams ¾ Details of component inputs, outputs, and interconnections ¾ Reference designators (device types and labels) ¾ Pin numbers ¾ Names for all signals ¾ Page-to-page connectors Good documentation saves time for those who review, modify, and test the circuit
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March 18, 2010 COCO Ch 6, Part I 17 Schematic diagram (everything necessary to build it)
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March 18, 2010 COCO Ch 6, Part I 18 Use informative signal labels NOT w, x, y, z or A1, A2, A3, A4.
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March 18, 2010 COCO Ch 6, Part I 19 Standard logic symbols
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March 18, 2010 COCO Ch 6, Part I 20 Choose the logic symbol that requires least thinking to understand the circuit
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This note was uploaded on 01/27/2011 for the course ECSE 2610 taught by Professor Ji during the Spring '08 term at Rensselaer Polytechnic Institute.

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Ch6_1 - COMBINATIONAL LOGIC DESIGN PRACTICE(Chapter 6 Today I/O Documentation Intro to PLA COCO Ch 6 Part I 1 The evolution of I/O COCO Ch 6 Part I

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