74F283 sometimes gives wrong output on digital probes


I have strange problems with the sensors showing the wrong exit. I am designing a CPU, and what is happening on a design more complex and now even on a simple.

I am running:

13.0 Multisim education Edition

Application version: 13.0.0 (13.0.632), database version: 13.0.a

Build date: Saturday, July 13, 2013, 19:42:19

I'll be sure to include a copy of my simple circuit I brought back a multipage ALU 16 bits of 74F181 and 74F182 of an Adder 4 bits using a 4-bit Adder unique with fast include, 74F283.

The installation program:

I have 9 bits go to the entries. They are made of SPDT switches, each wired to VCC and ground, selectively.

The first four "strands" or switches (Q, W, E, R keys) control A3... A0,

The second of four switches (keys A, S, D, F) control B3... B0,

The space bar control Carry-In.

I also 3 series of XOR (74F86) switching each of the inputs and outputs on a selective basis.

1 key allows to reverse the input bits A,

Press 2 to reverse the B input bits,

3 button to reverse the output bits.

The four bits of the sum and the Carry-Out bit are each thread to their own digital logic probe (PROBE_DIG_GREEN).

The problem:

Exit lights are sometimes wrong, but the way that simple I know how to reproduce the bug is as follows:

Load the file. and run the simulation.

Press Q to switch the MSB of the seized A.

Watch the lights of the probe. They're probably showing an inverted output.

Press 3 to reverse the result.

See the same lights.

Press 3 to delete (UN-invert) exit.

The output is corrected as it should have been from the beginning.

Alternatively, press space to show lights crazy and 3.

You can compare this to allowing the LSB of the input A (R key) instead of the MSB (Q key) and see how it is supposed to work.

Why does this work? I'm doing something wrong? Is this a bug with the software? Y at - it update?

Help, please!

-Richard Collins

Student in electrical and computer engineering at SUNY-IT


Hi rich,

I replaced your switch with a digital constant interactive, it is easier to see the digital input as the bipolar switch.  You can find this part in the in the Group of 'Sources' on the family of "Digital Sources".  Your scheme lacked a digital pattern, it most cases this affect the circuits, but from time to time, he made another, the modified file is attached.

Also attached is an Excel file with the conditions you described and the exit, I had, I don't see a problem with the logic of the circuit. Please let me know if I'm missing something.

Tags: NI Software

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