TLU+ files: TLUP

•In Apollo and Astro technology there is a linear capacitance model, where the net capacitance is calculated in terms of capacitance per square user unit of conducting and via layers specified in the Milkyway technology file (or .tf file). To get higher extraction accuracy and still get the runtime benefit, a Table Look-Up model or table, which contains wire capacitance at different spacings and widths, is precalculated and stored in the Milkyway technology file. TLU internally calls capGen, which is normally bundled with Astro and Apollo, to create this table. The Astro and Apollo Linear Parasitic Extraction (LPE) will look up appropriate wire capacitances from the table during the extraction. The grdgenxo command, which is normally bundled with Star-RCXT, is a more accurate engine to create the table than capGen. After processing and attaching the grdgenxo-generated capacitance table to the Milkyway database, the Astro LPE/TLUPlus will be able to extract the net capacitances using the same extraction engine but different CapTable compared to LPE/TLU.

1. R,C parasitics of metal per unit length.
2. These(R,C parasitics) are used for calculating Net Delays.
3. If TLU+ files are not given then these are getting from .ITF file.
4. For Loading TLU+ files we have load three files .
5. Those are Max Tlu+,Min TLU+,MAP file.
6. MAP file maps the .ITF file and .tf file of the layer and via names.