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Hi, Bean. Straight homework help here. Cool.How can I simplify this? I need to implement it using NAND gates only. I
thought maybe Demorgan, but I don't see how.
F=AB+AC+AD+BC+BD+CD
How can I simplify this? I need to implement it using NAND gates only. I
thought maybe Demorgan, but I don't see how.
F=AB+AC+AD+BC+BD+CD
Looks like schoolwork. But nevertheless:
Shaun writes: great answer!, even though I don't understand one word youHow can I simplify this? I need to implement it using NAND gates only.
I
thought maybe Demorgan, but I don't see how.
F=AB+AC+AD+BC+BD+CD
Hi, Bean. Straight homework help here. Cool.
Beginning digital logic classes are given three tools -- truth table,
Karnaugh
mapping, and Demorgan, right? First thing I did was just draw a truth
table.
Inspection shows there are only five cases where F is not true, so I
decided to
do this inverted -- that is, solve for what's not true, rather than what's
true.
Let Q = (A! AND B! AND C!)
Let R = (A! AND B! AND D!)
Let S = (A! AND C! AND D!)
Let T = (B! AND C! AND D!)
It should be obvious looking at the table that F! = Q + R + S + T (with A!
AND
B! AND C! AND D! being the redundant case which is true for all). Now,
you can
Demorganize that, and come up with what you have below, with the last NAND
being used to invert again from F! to F. View in fixed font (like M$
Notepad)...
.---.
A!----| |
B!----| |o----------
C!----|& | |
| | |
'---' |
.---. |
A!----| | | .-----.
B!----| |o------- | | |
D!----|& | | '-- | | __
| | | | | |-----| |
'---' '----- | |o------| |& |o-
.---. | & | ------|__|
A!----| | .------| |
C!----| |o------- | |
D!----|& | .---| |
| | | '-----'
'---' |
.---. |
B!----| | |
C!----| |o----------
D!----|& |
| |
'---'
created by Andy´s ASCII-Circuit v1.22.310103 Beta www.tech-chat.de
This is pretty similar to factoring quadratics back in high school -- your
ability improves with practice. Try solving problems in different ways,
and
just do what works.
Good luck.
Chris
It must be those cheesy ASCII representations Shaun ;-) I don't thinkchris wrote:
"CFoley1064" <cfoley1064@aol.com> wrote in message
news:20031019133527.28188.00000930@mb-m12.aol.com...
How can I simplify this? I need to implement it using NAND gates only.
I
thought maybe Demorgan, but I don't see how.
F=AB+AC+AD+BC+BD+CD
Hi, Bean. Straight homework help here. Cool.
Beginning digital logic classes are given three tools -- truth table,
Karnaugh
mapping, and Demorgan, right? First thing I did was just draw a truth
table.
Inspection shows there are only five cases where F is not true, so I
decided to
do this inverted -- that is, solve for what's not true, rather than
what's
true.
Let Q = (A! AND B! AND C!)
Let R = (A! AND B! AND D!)
Let S = (A! AND C! AND D!)
Let T = (B! AND C! AND D!)
It should be obvious looking at the table that F! = Q + R + S + T (with
A!
AND
B! AND C! AND D! being the redundant case which is true for all). Now,
you can
Demorganize that, and come up with what you have below, with the last
NAND
being used to invert again from F! to F. View in fixed font (like M$
Notepad)...
.---.
A!----| |
B!----| |o----------
C!----|& | |
| | |
'---' |
.---. |
A!----| | | .-----.
B!----| |o------- | | |
D!----|& | | '-- | | __
| | | | | |-----| |
'---' '----- | |o------| |& |o-
.---. | & | ------|__|
A!----| | .------| |
C!----| |o------- | |
D!----|& | .---| |
| | | '-----'
'---' |
.---. |
B!----| | |
C!----| |o----------
D!----|& |
| |
'---'
created by Andy´s ASCII-Circuit v1.22.310103 Beta www.tech-chat.de
This is pretty similar to factoring quadratics back in high school --
your
ability improves with practice. Try solving problems in different ways,
and
just do what works.
Good luck.
Chris
Shaun writes: great answer!, even though I don't understand one word you
wrote, but it did sound great
You are using Outlook Express and it is not easy to see the ASCIIIt must be those cheesy ASCII representations Shaun ;-) I don't think
anybody understands them with the possible exception of the poster!
Thanks for the tip Roger -"Baphomet" <fandaDEATH2SPAMMERS@catskill.net> wrote:
It must be those cheesy ASCII representations Shaun ;-) I don't think
anybody understands them with the possible exception of the poster!
You are using Outlook Express and it is not easy to see the ASCII
schematics in it.
You need to right-click the message in the message list, choose
"properties", details, source code, maximize window. then you will see
the message in notepad, with a fixed font, and these ASCII schematics
will make sense to you.
--
Roger J.
It works, if you only try to do it step by step.You need to right-click the message in the message list, choose
"properties", details, source code, maximize window. then you will see
the message in notepad, with a fixed font, and these ASCII schematics
will make sense to you.
I'm still too stupid to figure out how to do this in O.E., but I did look at
the post in Google and it made perfect sense, even to a dolt like me...DUH
I'm still too stupid to figure out how to do this in O.E., but I did look at"Baphomet" <fandaDEATH2SPAMMERS@catskill.net> wrote:
It must be those cheesy ASCII representations Shaun ;-) I don't think
anybody understands them with the possible exception of the poster!
You are using Outlook Express and it is not easy to see the ASCII
schematics in it.
You need to right-click the message in the message list, choose
"properties", details, source code, maximize window. then you will see
the message in notepad, with a fixed font, and these ASCII schematics
will make sense to you.
In OE, one clicks 'view' then 'text size' then 'fixed'."Baphomet" <fandaDEATH2SPAMMERS@catskill.net> wrote:
It must be those cheesy ASCII representations Shaun ;-) I don't think
anybody understands them with the possible exception of the poster!
You are using Outlook Express and it is not easy to see the ASCII
schematics in it.
You need to right-click the message in the message list, choose
"properties", details, source code, maximize window. then you will see
the message in notepad, with a fixed font, and these ASCII schematics
will make sense to you.
--
Roger J.
(My email address is a spam trap, don't use it)
Save the whole message to a text file and view it."Roger Johansson" <no-email@home.se> wrote in message
news:u438pvoajfuk0d82b7i6bfmi5rp0rl2grq@4ax.com...
"Baphomet" <fandaDEATH2SPAMMERS@catskill.net> wrote:
It must be those cheesy ASCII representations Shaun ;-) I don't think
anybody understands them with the possible exception of the poster!
You are using Outlook Express and it is not easy to see the ASCII
schematics in it.
You need to right-click the message in the message list, choose
"properties", details, source code, maximize window. then you will see
the message in notepad, with a fixed font, and these ASCII schematics
will make sense to you.
I'm still too stupid to figure out how to do this in O.E., but I did look at
the post in Google and it made perfect sense, even to a dolt like me...DUH
-------------