270L06Notes - EECS270,Fall2009,Lecture6 Page1of4

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EECS 270, Fall 2009, Lecture 6 Page 1 of 4 EECS 270 Fall 2009 Lecture 6 (9/28/09) Use pencil! 1. Combinational vs. Sequential Circuits Ignoring (gate and wire) propagation delays: Combinational: current output(s) = f(current inputs) Sequential: current output(s) = f(current and previous inputs) Examples: Circuit for displaying ambient temperature: combinational Circuit for displaying low and high temparetures over 24 hour period: sequential But how do we "capture" previous inputs and how are sequential circuits different from combinational circuits? We need a way to record (write down, remember, store, etc.) information. We need memory ! Lots of technologies for building a wide variety of memories: disk drives, flash, SRAM, DRAM, etc. We'll look into building a single bit memory from logic gates we've already seen. But first … 2. Is the world really digital? v i v o v i v o v i v o 0 1
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EECS 270, Fall 2009, Lecture 6 Page 2 of 4 3. Basic memory cell: feedback 4. Bistable element v i v o v i v o 1 2 v i v o v i v o
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EECS 270, Fall 2009, Lecture 6 Page 3 of 4 5. SR (Set ­ Reset) latch S QB R Q S R 0 0 0 1 1 0 1 1 Q QB S R Q QB
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EECS 270, Fall 2009, Lecture 6 Page 4 of 4 6. D (Data or Delay) latch D QB Q D 0 1 Q QB D DB QB Q
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270L06Notes - EECS270,Fall2009,Lecture6 Page1of4

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