[PCB_FORUM] Re: electrical constraint manager, timing

  • From: <sjcharles@xxxxxxx>
  • To: <icu-pcb-forum@xxxxxxxxxxxxx>
  • Date: Tue, 5 Jul 2005 20:08:14 -0400

I think i may be a little slow, I guess i could make trace length of clk line 
2300 to 2500 and make the data lines 2500 to 2700. 
I'll try tomorrow. 
> 
> From: "Ken Kiplinger" <kkiplinger@xxxxxxxxxxxxxxxxxxx>
> Date: 2005/07/05 Tue PM 04:41:03 EDT
> To: <icu-pcb-forum@xxxxxxxxxxxxx>
> Subject: [PCB_FORUM] Re: electrical constraint manager, timing
> 
> 
>     It depends on the structure of the nets. If they are all 2 pins, then it 
> doesn't matter. IF you have the voltage nets all assigned, then it will 
> ignore stubs to res, etc. If you set the delay for a pin pair, then the whole 
> net may be longer if there is more than just 2 pins in the net. Does that 
> make sense? The delta specified is to make the net shorter (with a positive 
> delta entered). Either way, the differences that you are showing in you net 
> lengths don't add up unless there is extra length to a stub or T. The best 
> way, if they aren't 2 pin nets, is to specify the pin pairs in the 
> spreadsheet, and copy the values for each pin pair. 
>     If you are assigning the lengths, and there are mixed net topographies, 
> then assigning the pin pairs is a must.
>  Ken Kiplinger
>  
> -----Original Message-----
> From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
> [mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx]On Behalf Of
> sjcharles@xxxxxxx
> Sent: Tuesday, July 05, 2005 12:57 PM
> To: icu-pcb-forum@xxxxxxxxxxxxx
> Subject: [PCB_FORUM] Re: electrical constraint manager, timing
> 
> 
> Sorry with all the questions but which setting works well for pin pairs? I'm 
> using longest Pin Pair.
> > 
> > From: "Ken Kiplinger" <kkiplinger@xxxxxxxxxxxxxxxxxxx>
> > Date: 2005/07/05 Tue PM 03:05:50 EDT
> > To: <icu-pcb-forum@xxxxxxxxxxxxx>
> > Subject: [PCB_FORUM] Re: electrical constraint manager, timing
> > 
> > 0 delta would be the target. Just skip it, and only assign the tolerance.
> >   Ken Kiplinger
> >   Design Solutions, Inc.
> > 
> > -----Original Message-----
> > From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
> > [mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx]On Behalf Of
> > sjcharles@xxxxxxx
> > Sent: Tuesday, July 05, 2005 11:52 AM
> > To: icu-pcb-forum@xxxxxxxxxxxxx
> > Subject: [PCB_FORUM] Re: electrical constraint manager, timing
> > 
> > 
> > we must have different software because i can't get 0 delta and 200 
> > tolerance the program gives me a "invalid" error message. 
> > Sam
> > > 
> > > From: "Austin Franklin" <austin@xxxxxxxxxxxx>
> > > Date: 2005/07/05 Tue PM 02:36:13 EDT
> > > To: <icu-pcb-forum@xxxxxxxxxxxxx>
> > > Subject: [PCB_FORUM] Re: electrical constraint manager, timing
> > > 
> > > Hi Sam,
> > > 
> > > I can't help you with the autorouter...just the Constraint Manager and the
> > > interactive router...  I think you have it set-up almost right.  Set PCLK 
> > > in
> > > Total Etch Length to 2500 min and 2700 max (that is your 2.5" =/- 
> > > .2"...did
> > > you mean =/- or +/-?), and then set-up a match group in relative 
> > > propagation
> > > delay with PCLK as your target.  But, I would set your group match length 
> > > to
> > > 0:200 (delta of 0, tolerance of 200), and that should give you the length
> > > match to +-200 to the target.
> > > 
> > > When you specify the tolerance in relative prop delay, you can set it in 
> > > the
> > > column for the group heading, and that applies it to the entire 
> > > group...then
> > > make sure PCLK is set to be the target.
> > > 
> > > Regards,
> > > 
> > > Austin
> > > 
> > > > Thanks Austin, I need the pclk to arrive to its destination a
> > > > little before the data lines, i'm told the CLK line can be about
> > > > 2.5 inches long =/- .200 inches. With those contraints i went to
> > > > the NET folder under Total Etch Length i put min 2500 and max
> > > > 2600 for pclk just to see how the router would do. Then i set up
> > > > the relative prop delays with the data lines.
> > > > I think i set those up correctly.
> > > > I made the PCLK (2.5 in) the target and the data lines 200 mil:10
> > > > mil. Which i'm told represents 200 mil longer or shorter than the
> > > > 2.5 in PCLK.
> > > > I did the pin pair and match group and i think everything is set
> > > > up right, but when i push the autoroute button my total etch
> > > > length are about 1000 mil over.
> > > > thanks again for your time.
> > > > Sam
> > > > >
> > > > > From: "Austin Franklin" <austin@xxxxxxxxxxxx>
> > > > > Date: 2005/07/04 Mon PM 09:17:56 EDT
> > > > > To: <icu-pcb-forum@xxxxxxxxxxxxx>
> > > > > Subject: [PCB_FORUM] Re: electrical constraint manager, timing
> > > > >
> > > > > Hi Sam,
> > > > >
> > > > > > I set the clock up in in ecset in NETS folder.PCLK is set up to
> > > > > > be 2300-2500 mils in length. The delta tolerance for the rest of
> > > > > > the match group is 200mils =/- 10 mils. Yet when i auto route my
> > > > > > clk is about 3000 mils and the rest fo the match group are about
> > > > > > 4500 mils. Where do i set up the prop delay of the PCLK?
> > > > >
> > > > > I'm not clear on exactly what you are doing here, and perhaps
> > > > on what you
> > > > > are trying to do.  Do you want a relative delay group (all the
> > > > signals are
> > > > > simply relative to each other or to one signal...the target),
> > > > or do you want
> > > > > them to all be fixed lengths (between a min and a max absolute 
> > > > > length)?
> > > > >
> > > > > It sounds to me (which is contrary to what I thought you
> > > > wanted), that you
> > > > > need specific lengths.  If you do, then you don't use relative
> > > > prop delay,
> > > > > but total etch length.  Let me know what you are trying to do, and I 
> > > > > can
> > > > > tell you how to do it.  I believe you only need to use one, total etch
> > > > > length or relative prop delay.
> > > > >
> > > > > Regards,
> > > > >
> > > > > Austin
> > > > >
> > > > > -----------------------------------------------------------
> > > > > To subscribe/unsubscribe:
> > > > >       Send a message to icu-pcb-forum-request@xxxxxxxxxxxxx
> > > > >       with a subject of subscribe or unsubscribe
> > > > >
> > > > > To view the archives of this list please login at
> > > > > //www.freelists.org. Our list name is icu-pcb-forum
> > > > > or go to //www.freelists.org/archives/icu-pcb-forum/
> > > > >
> > > > > Problems or Questions:
> > > > >       Send an email to icu-pcb-forum-admins@xxxxxxxxxxxxx
> > > > >
> > > > > Want to post a job listing ?  DON'T DO IT HERE!
> > > > > Better yet, join our jobs listing forum.
> > > > >
> > > > > SUBSCRIBE:  icu-jobs-forum-subscribe@xxxxxxxxxx
> > > > > POST:       icu-jobs-forum@xxxxxxxxxx
> > > > > -----------------------------------------------------------
> > > > >
> > > >
> > > > -----------------------------------------------------------
> > > > To subscribe/unsubscribe:
> > > >         Send a message to icu-pcb-forum-request@xxxxxxxxxxxxx
> > > >         with a subject of subscribe or unsubscribe
> > > >
> > > > To view the archives of this list please login at
> > > > //www.freelists.org. Our list name is icu-pcb-forum
> > > > or go to //www.freelists.org/archives/icu-pcb-forum/
> > > >
> > > > Problems or Questions:
> > > >         Send an email to icu-pcb-forum-admins@xxxxxxxxxxxxx
> > > >
> > > > Want to post a job listing ?  DON'T DO IT HERE!
> > > > Better yet, join our jobs listing forum.
> > > >
> > > > SUBSCRIBE:  icu-jobs-forum-subscribe@xxxxxxxxxx
> > > > POST:       icu-jobs-forum@xxxxxxxxxx
> > > > -----------------------------------------------------------
> > > >
> > > 
> > > -----------------------------------------------------------
> > > To subscribe/unsubscribe: 
> > >   Send a message to icu-pcb-forum-request@xxxxxxxxxxxxx
> > >   with a subject of subscribe or unsubscribe
> > > 
> > > To view the archives of this list please login at
> > > //www.freelists.org. Our list name is icu-pcb-forum
> > > or go to //www.freelists.org/archives/icu-pcb-forum/
> > > 
> > > Problems or Questions:
> > >   Send an email to icu-pcb-forum-admins@xxxxxxxxxxxxx
> > > 
> > > Want to post a job listing ?  DON'T DO IT HERE!  
> > > Better yet, join our jobs listing forum.
> > > 
> > > SUBSCRIBE:  icu-jobs-forum-subscribe@xxxxxxxxxx
> > > POST:       icu-jobs-forum@xxxxxxxxxx
> > > -----------------------------------------------------------
> > > 
> > 
> > -----------------------------------------------------------
> > To subscribe/unsubscribe: 
> >     Send a message to icu-pcb-forum-request@xxxxxxxxxxxxx
> >     with a subject of subscribe or unsubscribe
> > 
> > To view the archives of this list please login at
> > //www.freelists.org. Our list name is icu-pcb-forum
> > or go to //www.freelists.org/archives/icu-pcb-forum/
> > 
> > Problems or Questions:
> >     Send an email to icu-pcb-forum-admins@xxxxxxxxxxxxx
> > 
> > Want to post a job listing ?  DON'T DO IT HERE!  
> > Better yet, join our jobs listing forum.
> > 
> > SUBSCRIBE:  icu-jobs-forum-subscribe@xxxxxxxxxx
> > POST:       icu-jobs-forum@xxxxxxxxxx
> > -----------------------------------------------------------
> > -----------------------------------------------------------
> > To subscribe/unsubscribe: 
> >     Send a message to icu-pcb-forum-request@xxxxxxxxxxxxx
> >     with a subject of subscribe or unsubscribe
> > 
> > To view the archives of this list please login at
> > //www.freelists.org. Our list name is icu-pcb-forum
> > or go to //www.freelists.org/archives/icu-pcb-forum/
> > 
> > Problems or Questions:
> >     Send an email to icu-pcb-forum-admins@xxxxxxxxxxxxx
> > 
> > Want to post a job listing ?  DON'T DO IT HERE!  
> > Better yet, join our jobs listing forum.
> > 
> > SUBSCRIBE:  icu-jobs-forum-subscribe@xxxxxxxxxx
> > POST:       icu-jobs-forum@xxxxxxxxxx
> > -----------------------------------------------------------
> > 
> 
> -----------------------------------------------------------
> To subscribe/unsubscribe: 
>       Send a message to icu-pcb-forum-request@xxxxxxxxxxxxx
>       with a subject of subscribe or unsubscribe
> 
> To view the archives of this list please login at
> //www.freelists.org. Our list name is icu-pcb-forum
> or go to //www.freelists.org/archives/icu-pcb-forum/
> 
> Problems or Questions:
>       Send an email to icu-pcb-forum-admins@xxxxxxxxxxxxx
> 
> Want to post a job listing ?  DON'T DO IT HERE!  
> Better yet, join our jobs listing forum.
> 
> SUBSCRIBE:  icu-jobs-forum-subscribe@xxxxxxxxxx
> POST:       icu-jobs-forum@xxxxxxxxxx
> -----------------------------------------------------------
> -----------------------------------------------------------
> To subscribe/unsubscribe: 
>       Send a message to icu-pcb-forum-request@xxxxxxxxxxxxx
>       with a subject of subscribe or unsubscribe
> 
> To view the archives of this list please login at
> //www.freelists.org. Our list name is icu-pcb-forum
> or go to //www.freelists.org/archives/icu-pcb-forum/
> 
> Problems or Questions:
>       Send an email to icu-pcb-forum-admins@xxxxxxxxxxxxx
> 
> Want to post a job listing ?  DON'T DO IT HERE!  
> Better yet, join our jobs listing forum.
> 
> SUBSCRIBE:  icu-jobs-forum-subscribe@xxxxxxxxxx
> POST:       icu-jobs-forum@xxxxxxxxxx
> -----------------------------------------------------------
> 

-----------------------------------------------------------
To subscribe/unsubscribe: 
        Send a message to icu-pcb-forum-request@xxxxxxxxxxxxx
        with a subject of subscribe or unsubscribe

To view the archives of this list please login at
//www.freelists.org. Our list name is icu-pcb-forum
or go to //www.freelists.org/archives/icu-pcb-forum/

Problems or Questions:
        Send an email to icu-pcb-forum-admins@xxxxxxxxxxxxx

Want to post a job listing ?  DON'T DO IT HERE!  
Better yet, join our jobs listing forum.

SUBSCRIBE:  icu-jobs-forum-subscribe@xxxxxxxxxx
POST:       icu-jobs-forum@xxxxxxxxxx
-----------------------------------------------------------

Other related posts:

  1. Home
  2. icu-pcb-forum
  3. Archive
  4. 07-2005