Re: [SI-LIST] : Trace Length Question

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From: Tadashi Arai (arap@paso.fujitsu.co.jp)
Date: Mon Jan 15 2001 - 17:21:02 PST


Hi Bob,

Is "Query/Modify Pin Pair" function not enough for you ?
This shows trace length from pin to nearest pin on the net even if it
has several pins.

You can access this feature with...

Hit a trace -> ctrl-Q(Query/Modify) -> hit "Pin Pair" Button

or

Hit a trace -> F5(Select Pin Pair) -> ctrl-Q(Query/Modify)

Hope this helps you.

Regards,
//// /// // / / / / / / / / / /
Tadashi Arai//Platform Developing Dept.,Desktop Prd Div. Fujitsu Limited
arap@paso.fujitsu.co.jp TEL:+81-42-370-7624 Inagi-shi, Tokyo, Japan
/ / / / / / / / / / / // ///
On Mon, 15 Jan 2001 15:58:41 -0500
Mail from RKhederian@whiteedc.com described as below:

> Does anyone have any insight into the following problem:
>
> In order to maintain setup and hold times, we require various signals
> (Address, Data, etc.) to have no more than a certain time delay from the
> clock. Using the 6" = 1 nS rule of thumb, this calculates to some length.
> For example, a typical rule might read
>
> CLK length - 0.4 inches <= Address length <= CLK length +
> 0.7 inches
>
> We are using PADS to do the layout. It appears PAD's has no capability to
> calculate the length of traces, specifically when the signals route to
> several devices (i.e. an Address line routing to two memory devices). The
> result is our CAD department is spending a lot of extra time manually adding
> trace segment by trace segment. Do you know of any automated solutions that
> could generate a report, i.e. any third party software vendors? How are
> other companies handling these issues?
>
>
>
>
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