Re: 4 to 10 Decoder / 10 to 4 Encoder ---- Problems

On Tue, 30 May 2006 08:52:47 -0700, jlwilson wrote:

I am wanting to take a signal and put it into a 4 to 10 decoder. The
outputs of the decoder are going to be connected to a 10conductor cable
which will connect to the inputs of a 10 to 4 encoder.

I am then wanting to check the output of that encoder with the inputs
that I put into the decoder. If they are the same then the test has
been passed and if they are not equal then the test has failed.

This is going to be a tester for a 10 conductor cable. I dont want to
use 20 I/O's on my chip so I think using decoders/encoders is my best
bet.

Problem I am having is finding the encoders and decoders that match up.
The ones i ordered were:

Encoder: CD40147B
Decoder: CD4028B

If you look at the truth tables of these two they seem like they would
work exactly how I wanted them to. After the circuit failed I looked
more closely at the truth tables and then realized that the CD40147B's
truth table was negative logic. So now I am in a pickle.

Can someone please help me out in this matter? I am either looking for
a decoder to match my encoder, an encoder to match my decoder, or two
different IC's all together.

Thanks and I hope you guys can help me!!!


This has to be homework - if I were tasked to build a real 10-conductor
cable tester, I sure wouldn't use a priority encoder.

Thanks,
Rich


.

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