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Flip-Flop Orcad Pspice Simulation

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paragon

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pspice flipflop

Hello All,

I am new to this forum as well as Orcad.

I having some problems simulating a Flip-Flop ( 74LS74 from the psice lib)

When running the simulation I can see the alternating digital output from dstm into the clk of the flip-flop but when monitoring the D Q and QBar of the flip-flop all I see is three red flat lines ie no digital output.

If anyone could help explain how to implement this or even point me to a good tutorial / guide that would be great as I have googled this to death ;-)
I have purchased some books for Orcad from Amazon but am awaiting delivery.

I have uploaded two images, one of the capture and the other of the ocilloscope (pspice simulation)

25_1170946634.jpg

75_1170946111.jpg


TIA
SRG
 

Give power supply and ground

u give D to VDD and see the output first

u see output file it will have the clear error message
 

Hi,
I am also facing the same problem by getting straight lines.
I think u must have finished analysing the outputs,
Could any one can help me..


Thanks in advance
 

you have to define the initial status for the flipflops

In Analysis --> Setup --> Digital Setup you may see FlipFlop Initialization marked as All X. Change the value to All 0 or All 1 and see if you can now simulate it.
 

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