tailieunhanh - Latches and Flip-Flops

Chapter 6 – Latches and Flip-Flops Page 1 of 28 Contents Latches and Flip-Flops | Chapter 6 - Latches and Flip-Flops Page 1 of 28 Contents Latches and Bistable SR SR Latch with D D Latch with D Alternative Smaller D Flip-Flop with Asynchronous Description of a Characteristic Characteristic State Excitation Timing Example Car Security System - Version VHDL for Latches and Implied Memory VHDL Code for a D Latch with VHDL Code for a D VHDL Code for a D Flip-Flop with Enable and Asynchronous Set and Flip-Flop SR JK T Summary Checklist. 25 Index . 28 Digital Logic and Microprocessor Design with VHDL Last updated 6 16 2004 8 30 PM Chapter 6 - Latches and Flip-Flops Page 2 of 28 Chapter 6 Latches and Flip-Flops Control Inputs Data Inputs Control unit J it L -ELJ- State Next- Memory state Logic register Output Logic K. . y P K. P Control Signals P K. I P register ALU 1 0 I Datapath _ 8 Status Signals 8 Control Outputs Data Outputs Digital Logic and Microprocessor Design with VHDL Last updated 6 16 2004 8 30 PM Chapter 6 - Latches and Flip-Flops Page 3 of 28 So far we have been looking at combinational circuits in which their output values are computed entirely from their current input values. We will now study the behavior of sequential circuits where their output values are dependent not only on their current inputs but also on their past input values. The car security system from Section is an example of a combinational circuit. In the example the siren is turned on when the master switch is on and someone opens the door. If you close the door then the siren will turn off immediately. For a more realistic .

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