01 Notes on Digital Systems

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Hierarchical Approach- I• Identify the system inputs, outputs and behaviour– This is in our system specification• Example- feature telephone top design1 2 34 5 67 8 9* 0 #KeypadD-AConverterLineControlDAAInterface(Analog)LCDHandsetSwitchLine Control &Dialing18
Hierarchical Approach- II• We now split the system into discrete blocks which have(typically) a single function (termed highly cohesive) andidentify the way in which they are interconnected• An example of this is presented in schematic 1 where thehierarchy of our ‘phone has been taken down a level togive the internal details of the telephone IC– The system is now comprised of 5 blocks which perform asingle function within the whole system (e.g. display control)– Could further decompose design– Note that the inputs and outputs are the same as the previouslevel (i.e. keybd[6..0] etc.)19
Page 1 and 2: Electronic System Design 31.The Dig
Page 3 and 4: Nobel Prize in Physics - 2000Jack S
Page 5 and 6: Summary• Design Issues- IC’s an
Page 7 and 8: Some Definitions• Design- The pro
Page 9 and 10: Motivation• Building IC’s is ju
Page 11 and 12: MotivationHave to get things right
Page 13 and 14: The Problem• It’s the first day
Page 15 and 16: Design Flow- II• So, how do we st
Page 17: Hierarchical Approach- Example• I
Page 21 and 22: Regularity• Regularity is also us
Page 23 and 24: Design Reuse- Requirements• Block
Page 25 and 26: Tools for Design &Implementation
Page 27 and 28: The Digital Design Flowentity ANDGA
Page 29: HDL’s- Background• Broadly 2 di

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