lecture8 - Computer Programming I TA C162 Todays Agenda...

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1 Computer Programming I TA C162 20/01/06 Today’s Agenda Combinational Circuits contd. . Full Adder Decoder Multiplexer Storage Elements RS Latch Gated D Latch {Controlled version of RS} Register
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2 Computer Programming I TA C162 20/01/06 R-S Latch: Simple Storage Element R is used to “reset” or “clear” the element Set it to zero S is used to “set” the element – Set it to one If both R and S are one, output could be either zero or one quiescent” state -- Holds its previous value Note: if a is 1, b is 0, and vice versa
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3 Computer Programming I TA C162 20/01/06 Clearing the R-S latch Suppose we start with output = 1, then change R to zero. Output changes to zero. Then set R=1 to “store” value in quiescent state. 1 0 1 1 1 1 0 0 1 0 1 0 0 0 1 1
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Computer Programming I TA C162 20/01/06 Setting the R-S Latch Suppose we start with output = 0, then change S to zero Output changes to one. Then set S=1 to “store” value in quiescent state.
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lecture8 - Computer Programming I TA C162 Todays Agenda...

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