( ESNUG 370 Item 1 ) -------------------------------------------- [05/17/01]
Subject: ( ESNUG 352 #1 ) Ultima (Celestry) "ClockWise" Is Very Unstable
> I recently taped out a design on which I inserted clock trees using the
> Ultima ClockWise tool and really liked it. In the past I have used
> intentional skew in special situations to help improve timing, but it
> was difficult time consuming hand work.
>
> I have always thought that having an automated way of using skew to
> improve timing would be great, but it seemed like a difficult problem.
> In the past I have seen a few academic papers on the subject, but until
> recently I have never heard of a commercial tool. Ultima has pulled off
> a very nice implementation of a "useful" skew tool.
>
> - Jon Stahl, Principal Engineer
> Avici Systems N. Billerica, MA
From: Himanshu Bhatnagar <himanshu.bhatnagar@conexant.com>
Hi, John,
Through ESNUG 352, I heard of Ultima Tech's Clockwise tool. I evaluated it
about 8-9 months ago. Clockwise is a piece of junk. It's a clever idea,
but the interfaces to other tools are extremely unstable. While passing
data back-and-forth from Ultima to Avant, I ran into several issues. The
Ultima support staff provided 2-3 patches within 2 weeks of our eval to fix
these problems. I just don't know how they can sell this tool. Maybe now
they've improved it.
- Himanshu Bhatnagar
Conexant
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