05_flipflops - Combinational vs. Sequential Logic Readings:...

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94 Combinational vs. Sequential Logic Combinational logic no feedback among inputs and outputs outputs are a pure function of the inputs e.g., seat belt light: (Dbelt, Pbelt, Passenger) mapped into (Light) Network implemented from logic gates. The presence of feedback distinguishes between sequential and combinational networks. - - - X1 X2 Xn Logic Network Z1 Z2 Zm - - - Logic Circuit Dbelt Pbelt Passenger Seat Belt Light Readings: 7-7.4.4 95 Circuit can temporarily go to incorrect states Hazards/Glitches B Copilot Autopilot Request Pilot Autopilot Request Pilot in Charge? Autopilot Engaged A C CAR PIC PAR A B C AE Must filter out temporary states
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96 Safe Sequential Circuits Clocked elements on feedback, perhaps outputs Clock signal synchronizes operation Clocked elements hide glitches/hazards Clock - - - X1 X2 Xn Logic Network Z1 Z2 Zm - - - Clock Data Valid Compute Compute Valid Compute 97 Storage Elements: Latches vs. Flip Flops Latch: level sensitive: continuously sampling
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05_flipflops - Combinational vs. Sequential Logic Readings:...

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