Design a decade up counter using JK flip flops. THe conter should count from 0 to 9 and back to 0, etc.
Include a "COUNT" input to control the counter. THe counter will advance only if the COUNT = 1.Also include a "CARRY OUT" output. This output is high when the counter is enabled and has reached the count 9 .
The CARRY OUT signal is use as the COUNT input for the next stage in a multi- stage counter. The CARRY OUT should be 0 if the COUNT input is 0. This will assure that all stages are disabled from counting.