Timing Library Format

Timing Library Format (abbreviated TLF) is a file format used by electronic design automation tools. A TLF file is a text file in nature{{cite web|url=https://www.ee.virginia.edu/~mrs8n/soc/SynthesisTutorials/ct_tlfref.pdf|title=Timing Library Format Reference|date=October 2000|accessdate=6 May 2021|publisher=Cadence Design Systems|archive-url=https://web.archive.org/web/20210506174636/https://www.ee.virginia.edu/~mrs8n/soc/SynthesisTutorials/ct_tlfref.pdf |archive-date=2021-05-06 }} and contains timing and logical information about a collection of cells (circuit elements).

The TLF file contains information on the timing and power parameters of the cell library. It is used to determine delays of I/O ports and interconnects of the final design.