[SI-LIST] Re: Query regarding XTK Files
- From: "Abe Riazi" <ARIAZI@xxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Sat, 17 Aug 2002 08:29:07 -0700
Subramanya C K Wrote:
> Can anyone there please guide me as to how to extract the IDD
> (Interconnect Delay Data) file from either ISF (Inter Segment File) or
> QNF (Quad Net Format File), extracted from Veribest (I am not sure >about
the version).
> Thanks in advance.
>
> Have a nice Day,
> Subramanya C K
>
Hi Subramanya:
The Interconnect Delay Data (.idd) file is outputted by executing the XNS
program, and is mainly intended as input to a timing analysis simulator such
as BLAST (or MOTIVE).
It is interesting to note that another way to utilize the .idd file contents
(e.g. the listing of drivers / receivers and the associated network delays)
is to import the data into the Microsoft Excel program. A spreadsheet can
then be generated for ascertaining the common clock and/or source
synchronous setup and hold timing margins..
Effects of TIME_TO_VM needs to be taken into consideration when appraising
the IDD results. With the V(m) correction Enabled, XNS will subtract driver
TIME_TO_VM and report the corrected delays in .idd (also in .rep and .gen)
file. Such TIME_TO_VM correction (to prevent double counting of buffer
intrinsic delay) can prove critical when flight time values are to be used
for setup and hold margin computations.
Above techniques should be applicable to XTK files extracted from a PCB
data base generated by the VeriBest or by other EDA tools such as Allegro,
PADS, etc.
I hope you find this information helpful.
Best Regards,
Abe Riazi
ServerWorks
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