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Context level (0) DFD to model the programming of a VCR

Context level (0) DFD to model the programming of a VCR. Tape retailer. New tape. program VCR. TV guide. Visual program data. tape. tape. VCR program data. VCR status data. VCR. error. TV guide. tapes at home. Tape retailer. New tape. visual program data. extract

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Context level (0) DFD to model the programming of a VCR

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  1. Context level (0) DFD to model the programming of a VCR Tape retailer New tape program VCR TV guide Visual program data tape tape VCR program data VCR status data VCR

  2. error TV guide tapes at home Tape retailer New tape visual program data extract /insert control data entry control VCR status read data home tape home tape tape directive resolve error get tape put tape done-with tape monitor VCR selected tape handle tape tape VCR status data decide on tape tape enter VCR data VCR VCR program data VCR data A level 1 DFD to model the programming of a VCR

  3. Display panel data Tape status Programming status o o o o Tape ejected Tape accepted Program OK No program “no-tape” LED on “tape-in” LED on “prog-present” LED on “prog-present” LED off Boolean Boolean Boolean Boolean DSD for control flow“VCR status” VCR status

  4. Deductive thought o o Get tape from VCR Put tape in VCR Boolean Boolean DSD for control flow“tape directive” tape directive

  5. Idle Tape accepted Tape ejected Get tape from VCR Program OK Tape accepted Extracting Put tape in VCR Inserting FSM for control process “extract/insert control”

  6. Locate valid TV guide Choose programme Read program details Scan rooms Check guides for date Confirm data format Memorise data Locate right page in guide Scan for right program SC for data process “read data” read data

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