Reduced Register "inst3" with stuck

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hi

The circuit is attached. how can I solve this error?

Thanks

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The output of the register is not used. So it is removed by the synthesis tool.

kind regards

GPK

Hi pletz

even the output of register is connected, it is giving the same error

kind regards

the JKFF inst 4 with J and K at VCC will toggle Q each positive clock edge.

so the output of inst4 is half the clock rate

inst 3 has K at GND and J connected to Q of the toggling inst 4 JKFF

the output Q should take over the input information with every positive clock edge

so if your output is connected the circuit should work

as you said, "inst3 ist reduced with stuck..." could you please add the complete message ?

Hi

Warning (14130): Reduced register "inst3" with stuck data_in port to stuck value VCC

kind regards

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Hi

Warning (14130): Reduced register "inst3" with stuck data_in port to stuck value VCC

kind regards

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J K Q

L L Qo Qo = level of Q before clock pulse

H L H

L H L

H H Toggle

Have look to the part of the trues table. You connect the K input to "L".

Q can only stay on the old level or in case of J = "H" can go to "H". After

going to high it will never change.

Kind regards

GPK