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Excitation Vectors PowerPoint Presentation
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Excitation Vectors

Excitation Vectors

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Excitation Vectors

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  1. Input Combinational Logic Output Excitation Vectors States Memory

  2. RS Latch Q+ = S + R’ Q Two Problems: R=S= 1 Not allowed, Data is transparent

  3. The D Latch Problem: Level sensitive

  4. JK Latch : Universal, Level sensitive, Timing Constraints due to feed back.

  5. Master Slave Flip Flop Edge sensitive,Set up and Hold time

  6. Master Slave Flip Flop Edge sensitive,-Falling Edge Set Up and Hold Time constraints Path to setup data Master Slave Q Q Q D D D D D Latch Latch Q C C C Path to hold data D C Q

  7. Edge triggered Flip Flop: Set up and Hold time Constraints

  8. Edge Triggered, D Flip Flop NAND1 S Q NAND2 NAND5 clk R NAND3 NAND6 D NAND4 reset

  9. NAND1 S Q NAND2 NAND5 clk R NAND3 NAND6 D NAND4 reset When CLK changes from 0 to 1 Case1, D=0: tsetup= t4, thold=t3 Case2, D=1 tsetup=t4 + t1 thold= t2

  10. NAND1 S Q NAND2 NAND5 clk R NAND3 NAND6 D NAND4 reset When CLK changes from 0 to 1 Case1, D=0: tsetup= t4, thold=t3 Path for hold Path for set up

  11. NAND1 S Q NAND2 NAND5 clk R NAND3 NAND6 D NAND4 reset When CLK changes from 0 to 1 Case2, D=1 tsetup=t4 + t1 thold= t2 Path to set up Path to hold

  12. D Flip Flop