[SI-LIST] Re: How Do Others Do Timing Analysis Without Tool Like BLAST

Lucky dude !
What if you had a complicated topology ? That is why you need to run *some*
simulation tool just to make sure your timings are met ( using the various
methodology existents ) and there are no signal integrity problems.
My  2 cents .. literally these days :-)
Adrian 


-----Original Message-----
From: Raja Patil [mailto:raja.patil@xxxxxxxxx]
Sent: Friday, September 21, 2001 9:51 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: How Do Others Do Timing Analysis Without Tool
Like BLAST



Hi Michael,

I don't understand what you mean by generating routing guidelines by doing
pre-layout timing analysis.

Consider a memory interface with Clk,Adr, and data lines. What I do is to do
a static timing analysis-mainly hand calculation. This gives me whether
there is any set-up/hold time violation or the margins I have. Then What I
do is to route these signals of *almost* equal length or maintain the diff
within the length given by margin(ns)*6in/ns(speed on the trace). I don't do
anything else.

Have I been damn lucky with my work or 
this is exactly what the tools(BLAST etc.) do?

regards,
- Raja
--

On Fri, 21 Sep 2001 10:03:41  
 Greim, Michael wrote:
>
>Hi Harold,
>
>There are any number of ways that one can do static timing
>analysis and there are a number of tools that one can perform
>this analysis with.  I think that the biggest barrier to 
>entry with most of these tools is cost.  Going to a show 
>like designcon will expose you to the number of vendors that 
>produce these tools and what the price spectrum may be.  The
>second element to this is what your tool flow is and how 
>information can be passed forward and backward.  By performing
>pre-layout timing analysis you can create a set of constraints 
>that can be used to drive your router.  This prelayout analysis
>can also set up your timing budget which can also help drive 
>your placement and find errors early in the design process.
>Errors found after routing are costly from both a dollar cost 
>and schedule perspective.  These constraints 
>can also be used to generate drcs so your timing errors can
>be easily found at the physical implementation.   Often times 
>timing analysis will be performed prior to placement to see 
>if the flight times have a reasonable budget.  The timing can
>then be performed after placement using the manhatten lengths
>of the routes to perform timing and finally after routing.  
>When done properly the post route sim should be quick and relatively
>uneventful.  
>
>I hope that this helps.
>
>Just my 0.02
>
>best regards,
>
>Michael Greim
>
>-----Original Message-----
>From: polus@xxxxxxxxxxx [mailto:polus@xxxxxxxxxxx]
>Sent: Friday, September 21, 2001 9:39 AM
>To: si-list@xxxxxxxxxxxxx
>Subject: [SI-LIST] How Do Others Do Timing Analysis Without Tool Like
>BLAST
>
>
>
>
>
>Greetings Everyone!
>
>How do the rest of you perform timing analysis. WE have XFX but not BLAST.
>Currently I do it in EXCELL with a home grown internal tool. This is
>cumbersome
>and time consuming.
>
>There has to be a better way, particularily for pre-layout design rather
>than
>having to wait for post layout data and using something like BLAST.
>
>Any suggestions?
>
>Harold Polus
>Lexmark Laser Printer Controller Development
>SI & EMC
>
>
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