[SI-LIST] Re: How Do Others Do Timing Analysis Without Tool Like BLAST
- From: "Raja Patil" <raja.patil@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Fri, 21 Sep 2001 09:51:23 -0700
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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