Outputs of a .lib File

• The output transition.
• The cell delay.

KEY A .lib produces output transition and cell delay.

LookUp Tables in .lib Files

• They give easy and fast access to characterized values.
• They consume less memory.
• Their accuracy is reduced for input values that fall outside the characterized range.

KEY LookUp tables make .lib access fast and memory-light, but lose accuracy outside the characterized range.

Information Captured in a .lib File

• Input capacitance.
• Leakage power across all conditions.
• The functionality of the cell.
• Output transition, stored as a lookup table.
• The cell delay table.
• The insertion-delay table for macros, which should always be verified during CTS.

KEY A .lib holds input cap, leakage, functionality, output transition, cell delay and macro insertion-delay tables.

Information Captured in a LEF File

• SIZE of the cell.
• TILE / site information.
• Symmetry of the cell.
• OBS - obstruction/blockage data.
• PIN boxes along with their layers.
• The origin of the cell.

KEY A LEF captures size, site, symmetry, obstructions, pin boxes with layers and the origin.