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Design >> Mixed-Signal Design >> what is a .tlf file?
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Message started by ywguo on Aug 16^th, 2004, 8:16pm

Title: what is a .tlf file?
Post by ywguo on Aug 16^th, 2004, 8:16pm

Hi,

What is a .tlf file? What is the used of .tlf file?

Thanks
Yawei

Title: Re: what is a .tlf file?
Post by Andrew Beckett on Aug 19^th, 2004, 10:11am

Depends on the context of course. It may be a "timing library format" file which is (was?) used in Cadence tools to hold digital timing information for cells. Not sure it's used in current tools (not really my area of expertise).

It was similar to Synopys' .lib files.

Andrew.

Title: Re: what is a .tlf file?
Post by jbdavid on Nov 1^st, 2004, 6:07pm

tlf (timing library format) is an industry standard format for standard cell timing information used in static timing analysis of CMOS logic gates after/during synthesis..
the other format, .lib, has been published for public use, but is still privately defined (not industry standard).. but .lib is the more often used format.

Static Timing Analysis tools are used to calculated gate and wiring delays used in logic simulation.
When running Mixed signal simulation, you generally need at least a minimum gate delay that is reasonably accurate to match the timescale of the analog simulation..
one can use STA to get an SDF (standard delay format) file for a circuit, where the delays are extracted from the library file (.tlf or .lib) added up, considering loading effects and (if available) wiring delays.
SDF files can annotate delays onto DIGITAL nets of a mixed signal simulation..