Problem with waveform and ...

Hello group,

I'm using Quartus 6.1 currently and alway having problem with its
waveform! first I was getting some glitches in it then I realized
that's because of the dealy characteristic of gates and ...

But now I have a simple half-adder which its waveform is totally
driving me nuts. when x and y (inputs) are zero the sum is 0 but
carry_out is 1 !!!!!

another issue is I need to create half-adder also a half-subtractor
and then based on those two must create a full-adder and full-
subtractor. I named the top-level as fas (full-adder/subtracor) so
when I compiled the half-adder it did start complaining so I changed
the top-level name to half-adder so it went fine.

The problem is now that I have coded the half-subtractor and
generating its waveform it keeps creating waveform for half-adder and
ignores creating waveform for half-subtracor. Anyway I'm having a good
time with this Quratus .... !

so I will appreciate it if somebody could let me know where I have
gone wrong.

Thanks
Amit

Amit

On Sep 16, 10:49 pm, Amit <amit.ko...@gmail.com> wrote:
> Hello group,
>
> I'm using Quartus 6.1 currently and alway having problem with its
> waveform! first I was getting some glitches in it then I realized
> that's because of the dealy characteristic of gates and ...
>
> But now I have a simple half-adder which its waveform is totally
> driving me nuts. when x and y (inputs) are zero the sum is 0 but
> carry_out is 1 !!!!!
>
> another issue is I need to create half-adder also a half-subtractor
> and then based on those two must create a full-adder and full-
> subtractor. I named the top-level as fas (full-adder/subtracor) so
> when I compiled the half-adder it did start complaining so I changed
> the top-level name to half-adder so it went fine.
>
> The problem is now that I have coded the half-subtractor and
> generating its waveform it keeps creating waveform for half-adder and
> ignores creating waveform for half-subtracor. Anyway I'm having a good
> time with this Quratus .... !
>
> so I will appreciate it if somebody could let me know where I have
> gone wrong.
>
> Thanks
> Amit

Wow. Ok Amit...you're all over the place. Slow down and post one
problem at a time. Show us your code and we'll do our best to make
sense of it. Right now all I can say is that it's clear you problem
is on line 42.

Shannon

Shannon

On Sep 17, 7:54 am, Shannon <sgo...@sbcglobal.net> wrote:
> On Sep 16, 10:49 pm, Amit <amit.ko...@gmail.com> wrote:
>
>
>
>
>
> > Hello group,
>
> > I'm using Quartus 6.1 currently and alway having problem with its
> > waveform! first I was getting some glitches in it then I realized
> > that's because of the dealy characteristic of gates and ...
>
> > But now I have a simple half-adder which its waveform is totally
> > driving me nuts. when x and y (inputs) are zero the sum is 0 but
> > carry_out is 1 !!!!!
>
> > another issue is I need to create half-adder also a half-subtractor
> > and then based on those two must create a full-adder and full-
> > subtractor. I named the top-level as fas (full-adder/subtracor) so
> > when I compiled the half-adder it did start complaining so I changed
> > the top-level name to half-adder so it went fine.
>
> > The problem is now that I have coded the half-subtractor and
> > generating its waveform it keeps creating waveform for half-adder and
> > ignores creating waveform for half-subtracor. Anyway I'm having a good
> > time with this Quratus .... !
>
> > so I will appreciate it if somebody could let me know where I have
> > gone wrong.
>
> > Thanks
> > Amit
>
> Wow. Ok Amit...you're all over the place. Slow down and post one
> problem at a time. Show us your code and we'll do our best to make
> sense of it. Right now all I can say is that it's clear you problem
> is on line 42.
>
> Shannon- Hide quoted text -
>
> - Show quoted text -



That's OK. I learned my lesson I had to use the same name for top-
level design as the entity name.

Thanks.

Amit