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  CS 150 - Fall 2000 - Sequential Logic - 1 Sequential Logic  Sequential Circuits  Simple circuits with feedback  Latches  Edge-triggered flip-flops  Timing Methodologies  Cascading flip-flops for proper operation  Clock skew  Asynchronous Inputs  Metastability and synchronization  Basic Registers  Shift registers  CS 150 - Fall 2000 - Sequential Logic - 2 C1 C2 C3 comparator value equal multiplexer reset open/closed new equal mux control clock comb. logic state Sequential Circuits  Circuits with Feedback  Outputs = f(inputs, past inputs, past outputs)  Basis for building memory into logic circuits  Door combination lock is an example of a sequential circuit  State is memory  State is an output and an input to combinational logic  Combination storage elements are also memory  CS 150 - Fall 2000 - Sequential Logic - 3 X1 X2 ã   ã   ã  Xn switching network Z1 Z2 ã   ã   ã  Zn Circuits with Feedback  How to control feedback?  What stops values from cycling around endlessly  CS 150 - Fall 2000 - Sequential Logic - 4 remember load data stored value 0 1 stored value Simplest Circuits with Feedback  Two inverters form a static memory cell  Will hold value as long as it has power applied  How to get a new value into the memory cell?  Selectively break feedback path  Load new value into cell

cfc_19071130.pdf

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