03-25-2015 11:23 AM
Hello
I am attempting to simulate the circuit attached below in Multisim 11. Basically, I am trying to make an 8 bit up/down counter from two 4 bit 74191 up/down counter devies. I have connected the first counter so that it counts up to 15 then halts at 15. The second counter is connected to the first so that when the first counter reaches 15, the second counter begins its count.
When simulating the circuit, the first counter seems to work fine- counts up to fifteen and halts there. However, I am never given an opportunity to see if the second counter starts counting as the simulation seems to slow to a crawl or stop at that point, and I dont know why this is happening.
Could someone please take a look at my circuit, or suggest a reason why this is happening?
03-30-2015 07:50 AM
Hi ARRozental,
I've had a look at your code and I'm not sure exactly how you are testing it. How can you tell if the second counter runs or not?
How is the slowing down manifesting itself?
When I run your circuit I can see no slowing down at all. The probes you have placed continue to update at the same rate.
Hopefully once I can spot the issue we can get your circuit working correctly.
Best wishes,
Charlotte N.