[SI-LIST] Re: negative propagation delay

  • From: Perry Qu <perry.qu@xxxxxxxxxxx>
  • To: art_porter@xxxxxxxxxxx
  • Date: Fri, 03 Oct 2003 10:01:42 -0400

Drop me an email if you need some of these, they are going hot but I can get 
you a discount, and everyone on the SI list. :)

art_porter@xxxxxxxxxxx wrote:

> Hey, if you can build enough of those negative delay buffers in series, we 
> can watch next week's football game and bet on the winners.
>
> -----Original Message-----
> From: Perry Qu [mailto:perry.qu@xxxxxxxxxxx]
> Sent: Thursday, October 02, 2003 1:03 PM
> To: si-list
> Subject: [SI-LIST] negative propagation delay
>
> Hi,
>
> I'm using ICX for SI/timing analysis. One thing I noticed, if a driver
> IBIS specified a large reference load (e.g., 50pF for uP), I will always
> end up with a negative propagation delay since my actual loading is much
> smaller compared with reference load.
>
> Would like to understand how I should correct the number to reflect my
> actual loading for timing analysis. I would think we can get the
> internal logic delay of driver through: (Tco - time_to_Vmeas@reference
> load); But then, how shall I add buffer delay for a real load and
> propagation delay for a real load--taking into account all the
> reflection effect (e.g., a daisy-chained bi-directional data bus).
>
> Thanks
>
> Perry
>
> --
> Perry Qu
>
> Design & Qualification       |      600 March Road
> Alcatel Canada               |      Ottawa, ON K2K 2E6, Canada
>
> DID: (613) 7846720           |      FAX: (613) 5993642
>
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--
Perry Qu

Design & Qualification       |      600 March Road
Alcatel Canada               |      Ottawa, ON K2K 2E6, Canada

DID: (613) 7846720           |      FAX: (613) 5993642


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