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LAN_403

Adam Horden

Sun Apr 19 2009, 05:46PM

Registered Member #176 Joined: Tue Feb 14 2006, 09:35PM
Location:
Posts: 44

Hi All,

First off now been around here in a while.

I have been set the task of building a counter based around D Flip Flops. I have come up with a state table, and inputs required to each inputs. I used K Maps to help simplify the expressions but the expressions come out correct and a quick check with some boolean algebra shows they are correct but something tells me I can simplify the expressions a little further.

My state table:
mod edit: oversized image

The equations I got from the state table are:

http://www.adamhorden.net/counter/counter_equations_actual_design_ver_01_no_exclusive.pdf

Looking at the expressions I am sure I can simplify further by using some exclusive terms but I am not sure how to go about this. D_{A1} that is just a XNOR function, looking at D_{A2} there is a XOR term, D_{A3} there is a XOR term just unsure how to show this and simplify using exclusive functions.

Any one give me some light been trying for about a day and I never seem to get any further that the simplified functions using the K Maps.

Thanks.

Adam

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