CMOS standard cell characterization kit.
LibreCell - Lib
Characterization kit for CMOS cells.
See install instructions in top-project.
Characterize a cell
The following example determines the input capacitances and timing delays of a combinational cell.
It is assumed that
FreePDK45 is installed in the users home directory.
Required inputs are:
- --liberty: A template liberty file which defines how the cells should be characterized.
- --include: SPICE files or models to be included.
- --spice: A SPICE file which contains the transistor level circuit of the cell (best including extracted parasitic capacitances).
- --cell: Name of the cell to be characterized.
- --output: Output liberty file which will contain the characterization data.
lctime --liberty ~/FreePDK45/osu_soc/lib/files/gscl45nm.lib \ --include ~/FreePDK45/osu_soc/lib/files/gpdk45nm.m \ --spice ~/FreePDK45/osu_soc/lib/source/netlists/AND2X1.pex.netlist \ --cell AND2X1 \ --output /tmp/and2x1.lib
Vizualize the result:
libertyviz -l /tmp/and2x1.lib --cell AND2X1 --pin Y --related-pin A --table cell_rise
Merging liberty files
lctime will output a liberty file containing only one cell. The
libertymerge command allows to merge this kind of
output file back into the liberty template.
The following example will take
base_liberty.lib as a template and update its
cell entries with the data found in
the liberty files in the
libertymerge -b base_liberty.lib \ -o output_liberty.lib \ -u characterization/*.lib
This approach allows to run characterization runs of multiple cells independently and in parallel (e.g using
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